School

East Providence High School **We aren't endorsed by this school

Course

PH 101

Subject

Physics

Date

May 18, 2023

Pages

1

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Page1of 1

Unit IX: Worksheet 1
1. Two objects, A & B, have identical velocities. Object A has 3 times the mass of object B.
Compare the momentum of each object. Justify your answer.
Pa = 3Pb <
13 m
3 mv
m
my
2. Two other objects, C and D, have identical masses. Object C has twice the velocity of object D.
Compare the momentum of each object. Justify your answer.
PC = 2 Pd< 2v
m / 2 mv
m mv
3. While being thrown, a net force of 132 N acts on a baseball (mass = 140g) for a period of
4.5 x 10"sec. What is the magnitude of the change in momentum of the ball?
J = AP
( 135 ) ( - 15 ) = AP
F = 132 N
5. 94 N.S = 5, 94 Kam
t =.45s
41 15 X10., 25
4. If the initial speed of the baseball in question 3 is vo = 0.0 m/s, what will its speed be when it
leaves the pitcher's hand?
AP = P2-PI
5. 94= (. 14) ( V 2- 0)
5 . 94 = muz - mu,
412. 40 = 5. 94
= V2
5. 94 = m ( v 2 - vi )
. 14
5 .
When the batter hits the ball, a net force of 1320 N, opposite to the direction of the ball's initial
motion, acts on the ball for 9.0 x 10" s during the hit. What is the change in momentum of the
ball? What is the final velocity of the ball?
F At = impluse = momentum = mav
1320 N * ( 9. 0 x 10- 35) = 11. 88 N - S= (0. 140 kg ) Av
Av = 84.9 m/S= VF-vi = 84.9 m/s = vf- (- 42.4m/s)= 42.5 m/s
6.
What force does the ball exert on the bat in the question above? Explain.
N 3rd law: bat on ball= -F ball on bat = 1320 N= - 1-13201