What is Impulse: Definition and 929 Discussions

In the field of consumer behavior, an impulse purchase or impulse buying is an unplanned decision by a consumer to buy a product or service, made just before a purchase. One who tends to make such purchases is referred to as an impulse purchaser, impulse buyer, or compulsive buyer. Research findings suggest that emotions, feelings, and attitudes play a decisive role in purchasing, triggered by seeing the product or upon exposure to a well crafted promotional message.

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  1. W

    Magnitude of velocity and impulse

    In one of MSU’s seven sacks, MSU linebacker Denicos Allen sacked UM quarterback Devin Gardner. Just prior to being sacked, the quarterback was at rest. Just after they collided, the two players were momentarily stuck together and both slide a distance of 1.5 m before coming to a stop. In...
  2. T

    Impulse of Impact: Force vs Time

    Is there any way to obtain the exact function of force with respect to time of an impact? I have heard of the equation: http://www.sciweavers.org/upload/Tex2Img_1425867132/render.png which tells you the impulse of an object with constant velocity as it impacts another object.
  3. _N3WTON_

    Linear Impulse and Momentum

    A stop block, s, prevents a crate from sliding down a \theta = 33 \hspace{2 mm} degrees incline. A tensile force F = (F_{o}t) N acts on the crate parallel to the incline, where F_{o} = 325 \frac{N}{s} . If the coefficients of static and kinetic friction between the crate and the incline are...
  4. RioAlvarado

    Collision with two cars (momentum and impulse)

    Homework Statement [/B] Two cars are approaching a perpendicular intersection without a stop sign. Car 1 has a mass ## m_1 = 900 kg ## and is heading north at ##v_1 = 25 m/s ##. Car 2 has mass ##m_2 = 700 kg ## and is heading west at an unknown speed ##v_2##. The two cars collide at the...
  5. S

    Understanding Momentum and Impulse

    Homework Statement 1) A hockey player makes a slap shot, exerting a force of 30.0N on the hockey pock for 0.16 seconds. What impulse is given to the puck? 2) The hockey puck shot in exercise 1 has a mass of 0.115 kh and was at rest before the shot. With what speed does it head toward the goal...
  6. K

    Impulse and Momentum of an auto

    Homework Statement An automobile has a mass of 2300 kg and a velocity of +16 m/s. It makes a rear-end collision with a stationary car whose mass is 1800 kg. The cars lock bumpers and skid off together with the wheels locked. (a) What is the velocity of the two cars just after the collision? (b)...
  7. R

    Force required to change direction

    Homework Statement The speed of a 2 kg object changes from 30 m/s to 40 m/s during a 5 s time interval. During this same time interval, the velocity of the object changes in direction by 90 degrees. What average force was applied during the time interval? Homework Equations impulse = F.t The...
  8. J

    Distance to traveled to reach 0m/s not matter in impulse?

    Homework Statement I figured out this homework problem, after many tries, but I'm confused about the correct final answer. Here's the question: The rebounding ball, mass of 0.06 kg, traveling horizontally at 7.6 m/s, is caught by a player who brings it to rest. During the process, her hand...
  9. I

    Impulse and Linear Momentum

    Homework Statement A 3500 lb Honda traveling 50 mph west veers into the approaching lane and runs head on into a 10,000 lb truck traveling 45 mph the other way. Scenario 1. The two vehicles become 1 (no loss of car parts). Scenario 2. The cars separate with the Honda going backwards at 30 mph...
  10. Satvik Pandey

    What Angle Should the Ball Strike to Initiate Pure Rolling in the Sphere?

    Homework Statement A large sphere rests on a rough horizontal ground, A ball of mass 'm' is thrown towards it along one of its radius at a speed 'u' , along an angle 'x' with the vertical Find the angle with the vertical at which the ball should strike (find x) so that the large sphere pure...
  11. physicsisgreat

    Finding Angular Velocity and Center of Mass Velocity for a Free Rotating Rod

    Homework Statement I have a rod of mass m and length l on a table without any kind of friction. I give it an impulse J in any point of distance d from the center of the rod, parallel to the table and perpendicular to the rod. Find the angular velocity ω and the velocity of the center of mass...
  12. Z

    Difference between impulse and magnitude of force

    we learned about the impulse of a force , but just then a question came to my mind , what's the difference between the magnitude of a force and its impulse , or are they the same ... ??
  13. M

    Momentum/Impulse- Calculating Average Force of Raindrops

    Homework Statement The problem says: "A record rainstorm produced 304.8 mm (approximately 1 ft) of rain in 42 min. Estimate the average force that the rain exerted on the roof of a house that measures 10 m * 16 m. Indicate any assumptions you made. (Note: density of water is 1000 kg/m3"...
  14. T

    Impulse and Acceleration for a Recoiling Car

    Homework Statement A car with a mass of 1000 kg crashes into a rubber wall with an initial velocity of 30 m/s and recoils at 15 m/s. The change in momentum occurs over 1 meter. Find the force that the car experiences and time for which this force acts. Homework Equations v22 - v12=2ad F=ma...
  15. oreo

    Impulse of Dropped Balls: Higher Heights Explained

    If we drop two balls same heights.One ball reaches higher height after bouncing than other then has that ball experienced larger impulse?
  16. I

    Impulse and Momentum of a rocket

    Homework Statement Small model rocketry engines are sized by specific impulse. One common size is a C6 engine. With each letter increase in engine size. The "C" engine is 10.0 N -s specific impulse. The "6" indicates that the engine produces an average thrust of 6 Newtons. How much time does...
  17. Amaterasu21

    Impulse: Question About Momentum Transfer

    Hey all! I was thinking about a problem the other day. (For some background, I'm a geology student - I took A-level Physics in high school, a few years ago, and have done a few physics modules since then at University, so I'm probably better educated in physics than the average person, but it's...
  18. julianwitkowski

    Impulse / 2-D Collisions / Need Clarification?

    Homework Statement A baseball with a mass of 0.152 kg is moving horizontally at 32.0 m/s [E], when it is struck by a bat for 0.00200 seconds. The velocity of the ball just after the collision is 52.0 m/s [W 20⁰ n]. a) Find the impulse experienced by the ball? b) Find the average net force of...
  19. B

    BIBO Stable if and only if impulse response is summable

    It is theorem of any course on signals that a linear time invariant system, whether in discrete or continuous time, is BIBO stable if and only if its impulse response is summable. The fact that summability implies BIBO stability is easy to prove. In fact, it's on the wikipedia page of BIBO...
  20. GiantSheeps

    Object on horizontal surface practice question please?

    So I have a physics midterm tomorrow that will have a five part, 10 point question about the following "an object pushed across a horizontal surface. You should be able to calculate net force, frictional forces from the coefficient of friction, acceleration, velocity, momentum, impulse, and...
  21. S

    Comparing Impulses in Unequal Mass Collisions

    Homework Statement In a collision between two unequal masses, how does the impulse imparted to the smaller mass by the larger mass compare with the impulse imparted to the larger mass by the smaller one? A) They are equal. B) It is larger. C) It is smaller. D) The answer depends on the ratio of...
  22. gauss44

    Force vs Time Graph: Impulse & Momentum

    Regarding the question here, https://www.physicsforums.com/threads/force-vs-time-graph-impulse.665936/ Would it be correct to say that the area under the plotted line equals momentum if the initial momentum were zero? (This is NOT a homework question. I am posting here since this was the...
  23. S

    Projectile Motion - Solving for initial velocity w/o time

    Homework Statement A motorcyclist wants to jump 20 cars placed side-by-side, making the jump 30m long (coming back to the initial height). Assume that the ramp is placed at an angle of 30 degrees from the horizontal. a. Calculate the initial velocity required to make the jump. b. Assuming the...
  24. S

    Momentum and Impulse questions

    Homework Statement The 45-kg boy has taken a running jump from the upper surface and lands on his 5-kg skateboard with a velocity of 5 m/s in the place of the figure as shown. If his impact with the skateboard has a time duration of 0.05 s, determine the total normal force N exerted by the...
  25. Q

    Impulse: Calculate & State Direction of Change in Momentum

    Homework Statement Calculate the impulse(change in momentum) in each of the following situations. Also, state the direction of the change in momentum. A 4kg ball strikes a stationary pin head-on at a speed of 3m/s. It continues to move in its original direction, but its speed is reduced to...
  26. ximsooriginalx

    Conservation of Momentum of a ball

    Homework Statement A ball is thrown against a fixed wall where it bounces elastically. The mass of the ball is M and the velocity just before it hits the wall is U. Ignore the force of gravity in this question. a) Does the Principle of Conservation of Momentum apply to this situation? b) Obtain...
  27. X

    Transfer function=Laplace of the impulse response?

    I saw in some books, that: Y(s)/X(s) = H(s) where, Y(s) is the laplace of the output X(s) is the laplace of the input H(s) is the laplace of impulse response. How to prove it? In the book Benjamin Kuo, he only mentions it without proof, and did not find it in the book of Oppennheim.
  28. Q

    Principle of impulse and momentum

    Homework Statement In the gear arrangement shown, gears A and C are attached to rod ABC, which is free to rotate about B, while the inner gear B is fixed. Knowing that the system is at rest, determine the magnitude of the couple M which must be applied to rod ABC, if 2.5 s later the angular...
  29. GiantSheeps

    How Is Impulse Calculated in Baseball Physics?

    Homework Statement A(n) 0.142 kg baseball is thrown with a speed of 19.5 m/s. It is hit straight back at the pitcher with a final speed of 26.6 m/s. What is the magnitude of the impulse delivered to the ball? Answer in units of kg · m/s (part 2) Find the average force exerted by the bat...
  30. T

    Impulse of person jumping on a force platform

    Homework Statement Starting from rest, a 65 kg athlete jumps down onto the force platform from a height of .6 m. While she is in contact with the platform during time interval 0s-.8s, the she exerts on it is described by the function F=9200t-11500t^2 where F is in N and t is in s. a) What...
  31. T

    Frequency and impulse response

    Hi, I have a discrete system with input x(t) and output y(t). Using the formula frequency response H(f) = y(f)/x(f) in the Fourier domain. Does this mean to find the frequency response I have to take the Fourier Transform of y(t) to get y(f) and divide it by the Fourier transform of x(t) ...
  32. R

    Why does the 30Ns vector get flipped in the Two Dimensional Impulse Problem?

    Homework Statement an object with a mass of 5.0 kg is moving 4.0m/s north when an impulse of 30Ns 45 deg N of W is applied to it. what is its new velocity? Homework EquationsThe Attempt at a Solution I understand the process until solving for the angle. Why does the 30Ns vector get flipped?[/B]
  33. E

    Convolution Dirac impulse and periodic signal

    Hi ☺️ i have to do a convolution with a periodic signal and a dirac impulse: x(t)=sen(πt)(u(t)−u(t−2)) h(t)=u(t−1)−u(t−3) The first is a periodic graph that intersect axis x in points 0 , 1 and 2 (ecc) The se ing is a rectangle ( Dirac impulse ) that intersect AxiS x in points 1 and 3. For...
  34. T

    Trying to model the acceleration of a system due to an impulse forcing function

    Homework Statement My team and I are working on a design project to design/modify a device that can go on hikes for paraplegic/quadriplegic people. Here is the current design (not designed by us): http://i.imgur.com/RAOq28k.png http://i.imgur.com/zgA3aCg.png We are thinking of adding a...
  35. A

    How Accurate Is the Calculated Friction Force for a Sled Sliding Down a Hill?

    Homework Statement The length of a slope is 500 meters and it's height is 10 meters. 60 kg sled went down the slope. Find the average friction force if it's speed in the end = 8 m/s (the starting speed = 0) Homework Equations Ft=mv-mv0 t=S/v The Attempt at a Solution Ft=mv-mv0=60*8=480...
  36. L

    Total Impulse: Solving the Equation

    What is the equation for total impulse? I tried looking it up on the internet, but they did not have it on the internet.
  37. K

    Impulse and Coefficient of Restitution from Ball Drop

    A 1.2kg ball dropped from a height of 3m onto a steel plate rigidly attached to the ground bounces back up to a height of 2.5m.(a). What is the impulse delivered to the ball by the plate? (b). What is the coefficient of restitution of the collision?I know my instructor wants me to use something...
  38. M

    How Do You Calculate Impulse and Force in a Racquetball Collision?

    Question A 0.0420-kg hollow racquetball with an initial speed of 12.0 m/s collides with a backboard. It rebounds with a speed of 6.0 m/s. a. Calculate the total impulse on the ball. b. If the contact time lasts for 0.040 s, calculate the average force on the ball. What I did on the test...
  39. Misheel

    How Long Does It Take for 10 Meters of a Rolled Flag to Unwrap?

    Homework Statement The flag is d=2mm thick and D=30 m long. We roll the flag and stick the short side of the flag (long side is 30m, short side's length is not given) on the ceiling so that the flag unwraps back to the ground. Flag is M=30kg. 1. Find the time it takes to 10 m of the flag to get...
  40. S

    How Does Breaking Apart Enhance Safety in Formula One Cars?

    Homework Statement Why are formula one cars(except the place where the driver sits) designed to break apart into small pieces very fast? I believe that there is all kinds of things as aerodynamics, but my assignment talks about how the breaking apart mechanism is a safety feature 2. Homework...
  41. T

    Calculating Impact Force of a Schmidt Hammer

    Hi! I have apparently forgotten way too much college physics, and could really use some help here. I'm trying to calculate the impact force of an instrument (a Schmidt hammer--uses a spring-loaded piston) that produces an impulse against a surface. The instrument registers a rebound value (which...
  42. K

    What happens to a rod when an impulse is applied and it's floating in space?

    1. a uniform rod of mass m and length l is placed horizontally on a smooth horizontal surface.An impulse is applied at one end perpendicular to the length of the rod. what is the velocity of centre of mass and angular velocity of rod just after the impulse is applied.
  43. AdityaDev

    Conserving Angular Momentum (Rigid Body Dynamics)

    Lets say i have a rod (length = L) hinged at one end (A).It is initially at rest.Now if an impulse (J) acts on the other end (B),can i conserve the angular momentum about A(the hinge)? that is can i write: JL=Iw?(I=moment of inertia,w=angular velocity) this is what i saw in the book. My Doubt...
  44. jtmbii

    Solve Direction of Impulse: Linear Momentum & Force

    This should be a quick question. I'm not understanding the overall concept of impulse/force direction very well. I appreciate your help. Homework Statement The 0.5kg ball strikes the rough ground and rebounds wit the velocities as shown. Determine the magnitude of the impulse the grounds...
  45. J

    Inelastic collisions, impulse, energy, and swordfighting.

    I have an interesting problem. I am involved in a historical fencing group which uses blunted swords to thrust with (think fencing foils and épées, but heavier and stiffer, with a rubber blunt on the end). We've been discussing various new weapons and needed to address safety. I decided to...
  46. Aprizal

    How is Impulse Calculated in a Collision with Changing Velocities?

    Homework Statement 1. An Aircraft Space 1000 kg moving with speed (2000 i m / s). A meteor strikes the plane so that speed become (2000 i + 2000 j m / s). how impulses collision? 2. A 0.5 kg ball collides with the ball perfectly Resilience The second is silent. The second ball away with half...
  47. J

    Impulse & Calculus Derivation

    Homework Statement Hi, need some help trying to understand calculus derivation of the rocket equation. If someone who be so kind as to look at the attachment where it is all laid out. Homework Equations All equations are listed in the attachmentThe Attempt at a Solution I have had a good go...
  48. A

    Basketball player dunk - impulse, net force, GRF

    Homework Statement Peter, a 100 kg basketball player, lands on his feet after completing a slam dunk and then immediately jumps up again to celebrate his basket. When his feet first touch the floor after the dunk, his velocity is 5 m/s downward; when his feet leave the floor 0.50 s later, as...
  49. Greg Bernhardt

    Force & Impulse: A Summary of Equations & Concepts

    Definition/Summary Force = impulse per time: \mathbf{F}\ =\ d\mathbf{I}/dt. For constant force, impulse = force times time: \mathbf{I}\ =\ \mathbf{F}\,\Delta t (by comparison, work done = force "dot" distance: W\ =\ \mathbf{F}\cdot \Delta\mathbf{s}). For varying force, impulse is the...
  50. D

    Rolling hoop hit with impulse. Find angle of deflection and max force.

    Homework Statement A child's hoop of mass M and radius b rolls in a straight line with velocity v. Its top is given a light tap with a stick at right angles to the direction of motion. The Impulse of the blow is I. a. Show that this results in a deflection of the line of rolling by angle...
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