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. F

    The Science Behind Why Peeling Off a Sticking Plaster Quickly Hurts Less

    Hello everyone, I do not need homework-guidance, but having read the COC, I decided this was the best suited place for my question. It's a conceptual-understanding type of question. I am trying to fully understand some new physics concept, namely momentum and impulse. ƩF = dmv/dt I...
  2. Saitama

    Spheres hanging by strings - Finding impulse of tension

    Homework Statement Two equal spheres of mass m are suspended by vertical strings so that they are in contact with their centres at the same level. A third equal sphere of mass m falls vertically and strikes elastically the other two simultaneously so that their centres at the instant of impact...
  3. U

    Calculating Impulse of Normal Force in a Frictional System with Thrown Ball

    Homework Statement Stick of mass M resting on frictional surface with friction coefficients μk=μs. From the center of the stick at time t=0 a ball of mass m thrown to the right with an angle θ above the horizontal and with speed v0. As a result of the throwing there is an impulse on the y...
  4. C

    What is the value of the impulse function?

    Homework Statement I am confused with the idea that the value of a delta function is infinity but when given a graph why is there an amplitude/magnitude value for the delta function. I have attached a graph. Assuming the phase is zero I'm trying to write a Fourier transform for it. Homework...
  5. A

    Impulse on a water bag being dropped

    I have been trying to derive an equation to represent how a bag full of fluid would react when dropped dependent on the fluids viscosity. Basically i have the general impulse equation: F∂t=∂P but the time is dependent on the fluids viscosity (higher viscosity the longer it takes for the impact...
  6. T

    Impulse in an inelastic collision

    Homework Statement 2 particles travel towards each other at 10ms-1. Particle 1 has a mass of 10kg and particle 2 has a mass of 30kg. It is an inelastic collision. Find the magnitude of the Impulse of particle 1 and 2. Homework Equations I=Ft=mv-mu m1u1+m2u2=(m1+m2)V The Attempt at...
  7. BitWiz

    Converting energy to impulse

    Problem: A nuclear generator produces energy used to accelerate a rocket. Given energy and mass, what is the acceleration a? Nuclear generators produce energy in GeV or joules which have the dimensions L-2T-2M which has a force-over-distance (MaL) component which seems inappropriate or at...
  8. Jadaav

    Difference between Impulse and Momentum

    What's the difference between impulse and momentum ? When do we use impulse or when do we say a body has impulse ?
  9. D

    MHB Information on Impulse Differential Equations

    I read a dumb article on a UK mathematician modeling a zombie take over with impulse differential equations. Unbeknownst to me, were impulse DE and the fact that they are used in orbital mechanics. I am unable to find much on this topic tough. I believe it is relative new (1990). Does...
  10. fluidistic

    Neuroscience Neural impulse, references and ideas

    Hello people, I would like some references, be it book or papers about the process of neural impulses at a single neuron level. My only reference so far is a book from 1974 (Stochastic models in biology) and so is probably outdated despite having around 30 pages on the subject. The more...
  11. U

    Saturn V specific impulse issue in velocity modelling with Tsiolkovsky

    Hi! I've been trying to model the Saturn V's velocity using Tsiolkovsky's ideal rocket equation, and in the process, I think I may have made a mistake with regards to the specific impulse? I've come up with the following equation, taking the change in gravity into account. (a(t) is the...
  12. S

    How to Calculate Impulse and Average Net Force in a Baseball Collision

    Hello, I am taking physics 12U through correspondence. I am having issues with this problem. I don't know why but I feel like I made a mistake in this. Can you guys check this question and verify my results. Thanks, very much. :smile: Homework Statement A baseball with a mass of 0.152...
  13. G

    Physics 12: Power Output Calculation for Accelerating Object

    A 5.0 kg object is accelerated from rest to 6.0 m/s while moving 2.0 m across a level surface. If the force of friction is 4.0 N, calculate the power output I used d=vt to find the time which was .33sec then i put that into P=Fd/t and had (49-4)(2)/.35 and got 270 Watts
  14. W

    Momentum and Impulse Questions

    1. A particle is initially traveling to the right when it hits a wall and turns around to the left. The momentum after the collision is less than the initial momentum. a)impulse on the particle is to the left b)impulse on the particle is to the right c)no impulse on the particle d)none...
  15. P

    Baseball change of direction Force and Impulse

    A softball of mass .4kg is pitched at a speed of 24 m/sec, the batter hits it back directly at the pitcher at a speed of 20 m/s. The bat acts on the ball for .015 secs. A: What is the impulse imparted on the ball? B: What is the average force exerted by the bat on the ball? pi= mv pi=...
  16. U

    Impulse and momentum question, relates to Biomechanics

    Homework Statement A male and female pair of dancers start dancing when the male lifts the female and throws her into the air. The female's mass is 40kg . The male exerts an average vertical force of 500n for 1.0s on the female. What is her vertical velocity when she is released into the air...
  17. N

    Can the Dirac Delta Impulse be eliminated in this differential equation?

    Hey experts, I have the following differential equation with an impulse described by the Dirac delta function dx/dt (t) = - a⋅x(t) + d⋅delta(t) x(0)=0 with a,d scalars. My problem is this delta function in the right hand side. Is there an equivalent formulation without the delta...
  18. F

    Calculate wind load using fluid impulse and momentum.

    I recently took a crash course that included some topics in fluid mechanics. I learned that you can use the concept of impulse and momentum the calculate the force of fluid, for instance a jet of water on a turbine blade. The equations used are: ƩFx = ρQ(Vx1-Vx2) ƩFy = ρQ(Vy1-Vy2) I...
  19. X

    Writing impulse in vector notation

    Homework Statement A baseball strikes a bat. It's moving at 40m/s to the left horizontally. When it hits the bat it leaves at 60m/s with an angle of 30 degrees to the horizontal. The mass of the ball is 0.25kg. Homework Equations P(momentum)=mv Pf-Pi=ΔP ΔP=J(impulse) The Attempt at a Solution...
  20. K

    Question Regarding Impulse and momentum

    Homework Statement Which will be more effective for knocking a bear down,A Rubber bullet or a Lead bullet of same momentum?and WHY? Homework Equations Equation for impulse of a body= F x t = MVf-MVi (change in momentum) The Attempt at a Solution I have no clue so please tell me...
  21. S

    Impulse and momentum for an athlete jumper

    Homework Statement Assume that the athlete approaches the take-off line from the left with a horizontal velocity of 10m/s, remains in contact with the ground for 0.1s, and take off at a 60°angle with a velocity for 10m/s, determine (1) the vertical component of the average impulsive force...
  22. A

    Impulse Response Function Problem

    I attempted by inputting u(τ-t)u(t-τ) into the second part of the integral. Since I want to change the second part of the integral to go from [+∞, -∞]. And as for first part of the integral I added a u(t-τ) term after the x(τ) to change the integral from [t,-∞] into [+∞, -∞]. I am not sure if I...
  23. J

    Impulse response of FIR filter given the output is known

    Hi all, I am faced with this question, I am stumped as it is presented in a different way to what I am used to: The output from a FIR filter for a unit step input u[n] is y[n] = δ[n] + 3 δ[n - 1] + 6 δ[n - 2] + 10 δ[n - 3] + 15 u[n] What is the impulse response of the FIR filter? A...
  24. J

    FIR filters, impulse responses and unit step function

    Hey everyone, the question I am faced with is this: Which of the following expressions involving δ[n] is incorrect? where "m" is a non zero integer and u[n] is the unit step function. A. u[n-m] = δ[n] + u[n-m+1] B. x[n]δ[n-m] = x[n-m] C. δ[n] = u[n] - u[n-1] D. δ[n]δ[n-m] = 0...
  25. F

    Finding Velocity and Impulse using Energy Considerations.

    My problem/issue has come up with part C of this question but it won't make sense unless I post parts A and B first and I would be grateful if you could check them whilst they are here :) . Homework Statement an object that has a mass of 800g drops from a height 2.5m. Once it has hit the...
  26. T

    Momentum and Impulse separation question

    Homework Statement 3 equal masses at rest break apart as shown. Find the 3rd velocity Homework Equations http://i168.photobucket.com/albums/u175/kingzer2/Photo2013-04-14073115PM_zps0ee829e4.jpg?t=1365985942 The Attempt at a Solution I really have no idea how to do this :( sorry
  27. U

    Rolling ball and impulse (Too easy to be true?)

    Homework Statement Homework Equations The Attempt at a Solution The change in velocity = a * change in ω I think that makes sense since for pure rolling v = aω 16 marks like that?
  28. S

    Explosion+Impulse: Calculating Pressure

    given the values of explosion and impulse how to calculate the pressure
  29. K

    Force and Impulse when Landing

    Homework Statement When a person parachutes, the impact velocity is equal to that attained in free fall from a height of 4.5 m. After contacting the ground, the jumper’s momentum is quickly brought to zero by the earth. Assuming that the person has a mass of 80 kg, what is the average force on...
  30. J

    Pulley System Problem with String Impulse (Atwood's Machine)

    Homework Statement Two particles of masses 8 kg and 5 kg are connected to the two ends of a light inextensible string which passes over a fixed smooth pulley. Initially each of the two particles are held at a position which is 5 m above a horizontal ground. The objects are then released from...
  31. F

    How Does Angus Macbangus's Head-butt Physics Work?

    1. Problem statement and all known variables The world champion head butter Angus Macbangus can accelerate himself from rest to head-butting speed of 8.5m/s. Since the upper body is involved in a properly executed head-butt, the effective mass of the head is 24kg. (Label the direction the head...
  32. A

    Converting series of impulses to a single impulse

    I made a circuit to generate a periodic impulse signal ,i.e, one impulse generated and a zero for around 1us and then repeated again, but ended up with continuous impulses. Is there a circuit which could add zeros in between two impulses? Here one impulse could be viewed as a |sin(x)|...
  33. B

    How Does Impulse Affect Momentum in Physics?

    Hey guys, Alright, I feel like this is super easy, but for some reason, I'm not getting the right answer. Could you guys point out my flaw? There are (one can say) three coequal theories of motion for a single particle: Newton's second law, stating that the total force on an object causes its...
  34. A

    Momentum, Impulse, and Collisions: Wooden Block Shot with a bullet

    1.So the problem given is the following, "A small wooden block with mass 0.775 kg is suspended from the lower end of a light cord that is 1.58m long. The block is initially at rest. A bullet with mass 0.0134 kg is fired at the block with a horizontal velocity v0. The bullet strikes the block...
  35. S

    Specific Impulse - I just don't get it.

    I'm working on a hard sci fi story, so I'm trying to get the technical details right - but I don't actually have a background in space travel, astrophysics, orbital mechanics, etc, so I'm running up against my own ignorance. I've Googled it, read the wiki, read NASA's site, and I'm still...
  36. A

    Impulse effects on an overdamped vibrating system derivation

    Homework Statement For a zero initial deflection and for a finite initial velocity, the time dependence of the vibration response of an overdamped system to an impulse is given by: (1) θ(t)=[I/(mω)√(ζ^2-1)][e^-(ζωt)][cosh(ω√(ζ^2-1))t] which for large values of time becomes: (2)...
  37. F

    Considering a short parabolic impulse as direct current?

    Is it possible to consider a short (20ns) impuls of only one polarity as a short segment of direct current in a simple circuit where the reflections are to be analyzed? If not, how should I treat this kind of voltage waves? The voltage is obviously not constant, but I wonder if it is possible...
  38. S

    What Do Unit Step and Unit Impulse Mean in Systems Control?

    Homework Statement Hi,can someone explain to me through real world examples what the unit step and unit impulse means in systems control?How are they related to the system's input? Thank you.Homework Equations δ(t) = unit umpulse u(t) = unit stepThe Attempt at a Solution
  39. perplexabot

    Understanding the Impulse Response: A Key Tool for Identifying Unknown Systems

    Hi all. A problem I was working on required that I find the impulse response where I am given the output function ( y(t) ) of a system in terms of the input ( x(t) ). I read somewhere that to find the impulse response, you need a function that relates the output and the input, then you...
  40. A

    Impulse Response of Causal Systems

    I am reading "Linear System Theory and Design" by Chen and he says (in what follows g(t,tau) is the impulse response function): If a system is causal, the output will not appear before an input is applied. Thus we have Causal <==> g(t,tau) = 0 for t < tau. However, this seems incorrect...
  41. T

    Force vs Time graph (Impulse)

    1. The problem I have trouble understanding slope and area on graphs. For a force as a function of time graph the area is equal to the impulse. Why is that? And what is the slope equal to? How do I know?2. Homework Equations p=mv fΔt=mΔv 3. The Attempt at a Solution So the slope should be...
  42. C

    Dynamics- Angular Impulse and Momentum Problem

    Homework Statement The 30-kg reel is mounted on the 20-kg cart. If the cable wrapped around the inner hub of the reel, with radius 150mm, is subjected to a force of P=50 N, determine the velocity of the cart and the angular velocity of the reel when t=4 sec . The radius of gyration of the reel...
  43. F

    Find Impulse Response of LTI system given transfer function

    Homework Statement Find the impulse response of a system with transfer function H(S) = (s+3)/(s^2+2s+1) or H(S)=(s+3)/[(s+1)^2] Homework Equations Poles are s1=s2=-1 y = Ae^st + Be^st The Attempt at a Solution In my notes I do not have an answer for the case when there is...
  44. S

    Impulse and Energy Question

    Homework Statement The "force platform" is a tool that is used to analyze the performance of athletes by measuring the vertical force as a function of time that the athlete exerts on the ground in performing various activities. A simplified force vs. time graph for an athlete performing a...
  45. GreenAce92

    Impulse and dispersive studies on fragmentation and armor

    Hello, I have just enlisted in the US Marine Corps Reserve and my first job as I was told is to drive trucks. Convoy. I was also told that I have the ability to modify my vehicle, that they would teach me to weld. So if I happen to get deployed into live action, I would like to armor...
  46. T

    Basic theory behind conservation of momentum and impulse.

    Conservation of momentum does not hold true? Homework Statement Here is the problem. State 2 is shown in the picture, it is right before impact. State 3 is after impact. I used conservation of momentum of the entire system (rod and table. However as you can see it shows us that the...
  47. jegues

    Signals unit impulse response h(t) ECHO

    Homework Statement a) Find the unit impulse response h(t) of an audio system that causes two echoes, one occurring at 0.5 seconds and the other one at 1.5 seconds. Please sketch H(w). (Magnitude and phase) b) Design a system that can eliminate noise coming from the 60Hz power signal (thus...
  48. R

    What weight does the scale report when 440 kg of sand have already been added?

    Homework Statement A pickup truck has a mass of 2400 kg when empty. It is driven onto a scale, and sand is poured in at the rate of 150 kg/s from a height of 3.0 m above the truck bed. At the instant when 440 kg of sand have already been added, what weight does the scale report? Homework...
  49. A

    Find a balls speed at a certain time with impulse chart

    Homework Statement A 0.155-kg ball, moving in the positive direction at 13 m/s, is acted on by the impulse shown in the graph below. What is the ball's speed at 4.0 s? The graph is attached below. Homework Equations J = F Δt The Attempt at a Solution I thought that it might...
  50. O

    Theoretical impulse response and its normalization

    greetings, helpful people around the world, we all have heard once in our lives that the signal that is measure from your instrument, be it a spectrometer, optical microscope or an NMR machine, is not the real signal distribution, but the convolution of the real signal with an instrument...
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