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. K

    Dynamics Impulse problem mechanical engineering

    Homework Statement find tension in cable and velocity of B after 5 seconds. System released from rest. no slipping, neglect weight of pulley and cable.Homework Equations τ(t) = Iω Parallel axis theorem? The Attempt at a Solution Picture of problem: http://i49.tinypic.com/5ue7sx.jpgthe question...
  2. E

    The impulse response of a high-pass filter

    Consider the passive high-pass filter that consists of a resistor (R) and a capacitor (C). The frequency response is H(\omega)=\frac{j\omega C R}{j\omega C R + 1}. What would be the impulse response of this high pass filter? This question translates to how to evaluate the following Fourier...
  3. F

    Impulse of a force - effect on linear and angular momentum

    Hi, I'm having trouble understanding what the relation is between the impulse of a force during a collision and the changes in linear and angular momentum during the collision. I know that the principle of conservation of linear momentum says that the total linear momentum before is equal...
  4. J

    Calculating Impulse on a Ball: Mass, Radius & Speed

    Homework Statement Lets say I have a ball rolling on a flat frictionless surface. I give it an impulse to set it into rolling without slipping at a speed u. The mass of the ball is m and the radius is a. How large is the impulse and where is it applied Homework Equations I guess linear...
  5. P

    LTI Difference Equation from Impulse response

    I've been told that to calculate the difference equation of an LTI system, you simply take the sample values of the impulse response as the coefficients of the x[n-k] terms in the difference equation. i.e. if h[n] = {1, 0.5, 0.25, 0.125} for n>=0, then y[n] = x[n]...
  6. M

    How do you find the Impulse Response, h(t)

    Homework Statement How do i find the impulse response, h(t), given the following? f(t) = 8t u(t) y(t) = (-2e^-2t + 8e^-t + 4t - 6) u(t)Homework Equations f(t) convolved with y(t) = h(t) The Attempt at a Solution I thought that you divide out y(t) by 8t to make f(t) = u(t) then take the...
  7. M

    Convolution Homework Involving Impulse Functions

    Homework Statement How do you do a convolution of two functions containing only impulses? Homework Equations Say you have 2 functions to convolve, f1 and f2. I can't do the impulse symbol, so let's call it q. Say f1 = 2q(t+1) + 2q(t-4) and f2 = q(t-3) What is f1 convolved with f2? Or how...
  8. M

    Best material to minimize Impulse?

    Homework Statement Basically I want to know what material (That I could easily access) would be great to minimize impulse in the following situation: A car is placed at the top of a ramp with some angle less than 45 degrees and at its front there is a tracker that measures the amount of...
  9. B

    Physics impulse and momentum lab help

    Okay so we have an impulse and momentum lab and I have to do the data analysis for my group. Usually I find the data analysis calculations a cathartic processes but I am totally stuck for this one. I am in a calc based physics lvl 1 course dealing in Newtonian mechanics. Anyway for the lab we...
  10. Y

    What is the Total Impulse Applied to the Box?

    Homework Statement Horizontanl force F is giving by F(x) = (2.00x + 1.00x^2) Newtons, acting on a 12.0kg box which is initially at rest and on a frictionless horizontal surface. Force is applied from x=0 to x=2.50 meters. What's the total impulse the force applies to the box? Homework...
  11. A

    Pivoted rod - impulse applied so no horizontal force on pivot

    Homework Statement There is a rod of length L pivoted on one end. It is originally at rest horizontally then released. When vertical, an impulse is applied to bring the rod to rest. Throughout the question I have worked out I = 1/3 mL^2 w= √(3g/L) at the vertical position and an...
  12. M

    Impulse vs Fnet relation to damage?

    what does more damage an object w/ a high acceleration or a greater momentum i was watching one of my favorite tv shows "Justified" and i started to wonder would a bullet moving at a greater acceleration hence greater force (F=ma) inflict more damage or would a bullet w/ a greater velocity...
  13. N

    Rolling without slipping on application of impulse

    HI, I am having some trouble understanding the effects of an impulse on rolling motion, particularly without slipping. For eg, if we take a sphere of radius R and mass M, then what is the point h above the centre C at which when an impulse is imparted, will cause pure rolling motion...
  14. E

    Physics momentum and impulse questions

    an 8.0 N force acts on a 5.0 kg object for 3.0 sec. what impulse is given to the object? what change in momentum does to his impulse cause? if the object's initial velocity is 25 m/s determine the final velocity of the object? i have the right answers because my teacher gave them to use ...
  15. E

    Momentum and impulse question # 2

    an object #1 is motionless and has a mass 10 times greater than the mass of object #2. if object #2 has a velocity of 50.0 m/s before impacting object #1 and if the collision is inelastic determine the final velocity of the objects... so i am confused do i mult. object #1 by 10 or object #2 i...
  16. E

    Baseball Pitch Momentum: Impact of Pitcher and Catcher on Ball's Momentum

    a baseball pitch throws a fastball to the catcher. assume the ball starts from rest in the pitcher's hand and that the ball is brought to rest in the catcher's mitt. also assume the ball loses no velocity while in flight. how will the balls change in momentum from the pitcher's throw compare...
  17. E

    Understanding Momentum and Conservation in Falling Balls

    consider a ball falling to the ground. a. why is momentum not conserved from the perspective of the ball? explain b. define a system for which the momentum of the ball falling to the ground is conserved
  18. R

    Impulse and momentum in an inelastic collision

    Please check my work for the first question. The second and third questions, I'm not 100% sure how to solve them. A ssume that a cement truck with a mass of 10,000 kg hits you while you were stopped at a traffic light, and that you are driving a Smart car with a mass of 750 kg. 1. If the...
  19. C

    Seriously struggling D: Impulse and Force Question

    Homework Statement Pleaseeee someone help me with this.. its literally hurting my brain A baseball with mass 0.152kg is moving horizontally at 32.0m/s[E] when it is struck by a bat for 0.00200 seconds. The velocity of the ball just after the collision is 52.0m/s [W20°N] a)find the impulse...
  20. C

    Impulse, Momentum, and Force

    Homework Statement 2000kg stationary cannon 25kg cannon ball fired horizontally @ 250m/s Assume no friction acting on the cannon ***What is the velocity of the cannon after firing the ball? Homework Equations PT = PT’ ^initial momentum = final momentum m1v1 + m2v2 = m1v1’...
  21. G

    Signals & Systems: Determine System Output

    Homework Statement Given: Impulse response: h(t) = u(t-1) - u(t + 1) (where u(t) is the unit step function) System input: x(t) = t*u(t) - t*u(t-2) Determine System output: y(10) = ? y(1) = ? max y(t) = ? |y(t)| is max at t = ? Homework Equations Convolution integral? y(t) = -∞∫∞...
  22. mishima

    Why Use Impulse in Experiments?

    Is impulse only really used in real life because of the instruments you might have? I'm having trouble understanding why this idea is a useful physical construct. The best I found is that just like work can be thought of as a "transfer mechanism" of energy, impulse is the "transfer mechanism"...
  23. S

    Impulse Word Problem: Find Momentum & Impulse

    Homework Statement A 12.5 ball traveling at a speed of 32.4 m/s strikes a wall and rebounds with the same speed. What is the impulse exerted by the wall on the ball? Part II A 12.5 g ball is traveling at a speed 3.4 m/s strikes the center of a 29.5 g ball of the same radius. The balls are...
  24. N

    Calculating Average Force in Nonelastic Collisions with No External Forces

    A 0.145-kg baseball pitched at 35.0m/s is hit on a horizontal line drive straight back toward the pitcher at 57.0 m/s. If the contact time between bat and ball is 2.50×10−3s , calculate the average force between the ball and bat during contact. The equation has something to do with...
  25. P

    Check Understanding Impulse & Frequency Response

    Homework Statement Find the impulse and frequency responses of the following systems: 1. y(n) = \frac{1}{N+1}\sum_{k=-N}^{N}(1-\frac{|k|}{N+1})x(n-k) 2. y(n)=ay(n-1)+(1-a)x(n), where 0<a<1 Homework Equations The Attempt at a SolutionOk so for 1. I look at h(n) which is...
  26. A

    Find Instantaneous Center of Rotation for Impulse on a Rod

    Homework Statement Suppose there is a rod on a friction less horizontal plane and an impulse "J" is given to it at a distance "x" from its center. Using this data I have to find out the instantaneous center of rotation. The Attempt at a Solution By impulse-momentum theorem, J =...
  27. H

    Help: maximum force of an object when given impulse and time on a graph

    I need help finding the maximum force of an object from an impulse graph. The graph of the force vs time gives me up to 10 seconds and the problem tells me that the impulse is 6.0 N*s. the line of the graph starts at (0,0), rises with a constant slope and peaks at 6 seconds. From there it falls...
  28. I

    Impulse for a car when it drives in a circle

    Homework Statement A 1400kg car is driving at a constant velocity, 5.3 m/s. It turns 90 degrees in 4.6 seconds. And then it slams into a tree and it takes 350 ms to stop the car. What is the impulse on the car (a) due to the turn? (b)Due to the collision with the tree? What is the...
  29. I

    Impulse, momentum, and force during motion around a circle

    Hello, How would you calculate the impulse during the time which a car drives in a circle. You are given the car's mass and constant velocity and the time that the car was turning and how many degrees the car turned. Thanks in advance!
  30. C

    Simple Harmonic Motion with Impulse

    Homework Statement A particle P of mass 0.6kg is attached to one end of a light elastic spring of modulus of elasticity 72N and natural length 1.2m. The other end of the spring is fixed to a point A on the smooth horizontal table on which P rests. Initially P is at rest and is 1.2m from A...
  31. R

    Engineering Solving Impulse Response of RL Circuit

    Hi all, I'm taking a fourth year time-series analysis course for Physics students. Homework Statement Let us consider a simple physical system consisting of a resistor (with resistance R) and an inductor (with inductance L) in series. We apply an input voltage a(t) across the pair in...
  32. D

    Impulse & Momentum: Solving Homework Problem

    Homework Statement http://courses.washington.edu/mengr230/sp11/handout/n25_ImpulseMomentum.pdf the problem at the bottom Homework Equations on the link The Attempt at a Solution I wrote out the equation and I don't really know where the friction factors in. I'm pretty much 100%...
  33. E

    How to derive impulse response from characteristic impedance

    i have a coax cable that will be used in data transmission. i have measured the open and short impedance and then characteristic impedance(Zo) for the cable. Eventually I will have a transmitter with Z_source in one end of the cable and receiver with Z_load at the other end of the cable. Is it...
  34. T

    Linear Impulse & Momentum - Distinguishing Impulsive & Non-Impulsive Forces

    when applying the principle of linear impulse and momentum , how do I know if the force should be considered impulsive or non-impulsive , how should I know if I should consider it in the equation , I already know that an impulsive force is a force that is applied for a very short time ,but in...
  35. J

    Momentum and Impulse: Dropping an Object

    1. A 2 kilogram egg drop apparatus began at rest and fell through approximately 5-m. Assume that it’s momentum was changed to zero in a time of 0.25-s. --What force stopped your apparatus? ---Mass=2kg ---Distance=-5m ---Time=.25-s 2.-Force(Time)=Mass(Velocity) 3.Velocity final for the...
  36. H

    Impulse Momentum Theorem + Egg Drop?

    Impulse Momentum Theorem + Egg Drop?? I have to explain how the impulse momentum theorem relates to my egg drop. My egg was padded with a styrofoam cup and tissues and a plastic bag parachute. Honestly, I don't understand the impulse momentum theorem and I am in need of help! I have fall times...
  37. L

    Calculating Impulse and Speed with a Variable Force

    A net force given by the expression A + Bt^2, where A and B are constants, is applied to a girl on roller skates in the +x direction. The girl has a mass m. The force starts at t1 = 0 s and continues until t = t2. Force= A + Bt^2 A and B are constants I'm not sure how to approach this...
  38. I

    What Is the Magnitude of the Impulse Delivered to the Football?

    A(n) 0.445 kg football is thrown with a speed of 15.1 m/s. A stationary receiver catches the ball and brings it to rest in 0.012 s. What is the magnitude of the impulse de- livered to the ball? Answer in units of kg · m/s f=m*a Δp=m*Δv i used f= ma since a= Δv/t i got F=...
  39. C

    Momentum & Impulse: Throwing a Ball at the Wall

    Why does the ''P2=P1'' (momentum before is equal to momentum after) isn't applied in cases where u throw a ball at wall? In this case, even is the velocity keeps the same, it will be in another direction, what makes it -v...
  40. S

    Understanding Impulse and Energy Transfer in Elastic Collisions

    I have been messing around with a metal ruler, a slick surface, and a small flat head screw driver at which I have inserted into a plastic tube allowing me to connect a rubber band. It is basically a "pinball" launcher, if you will. I did this to create an impulse on the ruler at a high force...
  41. F

    What is the required impulse to bring the car to rest?

    Homework Statement A car with a mass of 1.0 X 103kilograms is moving with a speed of 1.4 X10 2m/s. The impulse required to bring the car to rest is? Homework Equations impulse = change in momentum... The Attempt at a Solution the answere is 1.4 X 105 N X S or is it the negative...
  42. H

    BaseBall Question (Momentum & Impulse in 2 dimensions)

    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 20 N] a) Find the impulse experienced by the ball b) find the average net force of...
  43. Z

    Differential equation for motion in mass-spring system with impulse

    I am reviewing for a final and I don't know how an impulse affects the differential equation for motion in this mass-spring system. Can someone please help? A mass m=1 is attached to a spring with constant k=2 and damping constant c=2. x(0)=0 & x'(0)=0. At the instant t=π, the mass is struck...
  44. C

    Using hookes law to find impulse

    Homework Statement You are given a FORCE versus TIME graph, which shows oscillations with: A= 4N at the max points period is 4s spring constant (k)= 12.3 N/m mass of block exhibiting oscillation is 4.9 kg How do you find the IMPULSE delivered to the block during the 1st 2 seconds of...
  45. N

    Impulse, momentum and efficiency to find height formula

    http://a6.sphotos.ak.fbcdn.net/hphotos-ak-ash4/388044_10150449591037412_816037411_8386849_1415117382_n.jpg Homework Statement A ramp system is set up. Due to friction the ramp has an efficiency of 82%. Two cars of equal mass are allowed to collide and car 1 starts from rest at height h1...
  46. J

    Solve Momentum & Impulse Homework: Diver Leaves Raft at 4 m/s

    Homework Statement 18. A 75 kg swimmer dives horizontally off a 300 kg raft. If the speed of the raft immediately after the swimmer dives off is 1.0 m/s, at what speed did the diver leave the raft? A. 2 m/s B. 4 m/s C. 6 m/s D. 8 m/s E. 10 m/s Homework Equations p=mv The...
  47. C

    Frequency response and Impulse Response

    Im struggling to do the following question. Any help would be appreciated A following system has the following difference equation y(n)+ 1/8y(n-1) - 5/8y(n-2)=1/2x(n-1) First part is to calculate the system transfer function using the z transform. Then get the frequency response and...
  48. N

    Impulse Multiple choice question

    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) It is smaller. B) The answer depends on how fast they are moving. C) They are...
  49. H

    Help with Impulse, Free-Fall, and Momentum?

    Hello everyone. In Physics class, we did a lab where we dropped golf balls into a box of sand from a height of 9 ft (or 2.743 meters). The golf ball had a mass of .046 kg. We were not allowed to time the drop so these were the only givens. We also measured the depth of the "crater" the golf...
  50. E

    Impulse Waveform: Representing Data

    How do we represent data in terms of impulse waveform ??
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