Physics

Physics, 30.09.2019 21:10, cheetah810

Aforce sets an object in motion. when the force is multiplied by the time of its application we call the quantity impulse which changes the momentum of that object. what do we call the quantity force x (times) distance, and what quantity can this change?

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Physics, 13.07.2019 19:20, heids17043

Think about this and explain fully : ) a 2-kg object accelerates as a net external force is applied to it. during the 5-second interval that the force is applied, the object's velocity changes from 3 m/s east to 7 m/s west. several students discussing the impulse on this object state the following: student #1: "the impulse is equal to the change in momentum, which is (2 kg)(3 m/s + 7 m/s) = 20 kg m/s." student #2: "but the change in velocity is 4 m/s. we multiply by the mass to get the change in momentum, and also the impulse, which is 8 kg m/s." student #3: "the change in momentum of this object during these 5 seconds was 8 kg m/s, so the impulse applied to this object during these 5 seconds was 8/5 kg m/s." student #4: "the impulse is the force f times the time t, and since we don't know the force, we can't find the impulse for this situation." with which, if any, of these students do you agree? explain your choice and your reasoning.

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Physics, 02.08.2019 06:30, chrismeldajbaptiste

"a force sets an object in motion. when the force is multiplied by the time of its application, we call the quantity impulse, and an impulse changes the momentum of that object. what do we call the quantity force multiplied by distance? "

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Physics, 07.11.2019 05:31, mikego5

To understand the relationship between force, impulse, and momentum. the effect of a net force σf⃗ acting on an object is related both to the force and to the total time the force acts on the object. the physical quantity impulse j⃗ is a measure of both these effects. for a constant net force, the impulse is given by j⃗ =f⃗ δt. the impulse is a vector pointing in the same direction as the force vector. the units of j⃗ are n⋅s or kg⋅m/s. recall that when a net force acts on an object, the object will accelerate, causing a change in its velocity. hence the object's momentum (p⃗ =mv⃗ ) will also change. the impulse-momentum theorem describes the effect that an impulse has on an object's motion: δp⃗ =j⃗ =f⃗ δt. so the change in momentum of an object equals the net impulse, that is, the net force multiplied by the time over which the force acts. a given change in momentum can result from a large force over a short time or a smaller force over a longer time. now assume that the pitcher in part d throws a 0.145 kg baseball parallel to the ground with a speed of 20.0 m/s in the -x direction. the batter then hits the ball so it goes directly back to the pitcher along the same straight line. what is the ball's x-component of velocity just after leaving the bat if the bat applies an impulse of +6.9n⋅s to the baseball? enter your answer numerically in meters per second using two significant figures.

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Physics, 16.11.2019 05:31, mroueh21

Aforce sets an object in motion when the force is multiplied

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