Question

A
paintball’s mass is 0.0032kg. A typical paintball strikes a target
moving at 85.3 m/s.

A) If the paintball stops completely as a result of striking
its target, what is the magnitude of the change in the paintball’s
momentum?

B) If the paintball bounces off its target and afterward moves
in the opposite direction with the same speed, what is the
magnitude of the change in the paintball’s momentum?

C) The strength of the force an object exerts during impact is
determined by the amount the object’s momentum changes. Use this
idea along with your answers to (a) and (b) to explain why a
paintball bouncing off your skin hurts more than a paintball
exploding upon your skin.

Answer #1

a) The paintball stops after hitting the target i.e., the final velocity (v) is 0 m/s

Hence, change in momentum is

b) The paintball bounces off the target and moves in opposite direction with the same velocity.

If v be the velocity with which it struck then the velocity with which it will bounce off the target is -v

Hence, change in momentum is

c) When a paintball bounces off the skin (case similar to b) the change in momentum is greater than when it explodes( case similar to a). As during explosion the ball came to rest and hence imparted less change in momentum.

Hence, for a unit change in time, force (rate of change of momentum) exerted by a paintball bouncing off the skin will be greater than an exploding paintball.

So, a bouncing paintball hurts more.

A billiard ball of mass m = 0.25 kg strikes the cushion of a
billiard table at θ1 = 46° and a speed v1 =
25 m/s. It bounces off at an angle of θ2 =
670 and a velocity of v2 = 17 m/s. What is
the magnitude of its change in momentum (in kg·m/s)?

A 0.32-kg ball is moving horizontally at 30 m/s just before
suddenly bouncing off a wall Just after the bounce, it is moving
horizontally at 25 m/s but in the opposite direction.
(a) What is the magnitude of the change in momentum of the ball
during the bounce?
(b) What percentage of the ball's original kinetic energy was
lost in the collision?
please show work on paper

A ball of mass 2 kg is traveling towards you at 15 m/s. You are
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Assuming the ball bounces off you and travels in the opposite
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A car of 1200 kg travels east at 24 m/s while a truck of 2200 kg
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do all five questions
Question 1
20 pts
Ignoring the effects of air resistance, if a ball falls freely
toward the ground, its total mechanical energy
Group of answer choices
increases
remains the same
not enough information
decreases
Flag this Question
Question 2
20 pts
A child jumps off a wall from an initial height of 16.4 m and lands
on a trampoline. Before the child springs back up into the air the
trampoline compresses 1.8 meters. The spring constant...

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