1
What are the SI units for momentum?
kg*m/s
If a force is exerted on an object, which statement is true?
a. A large force always produces a large change in the object's momentum.
b. A large force produces a large change in the object's momentum only if the force is applied over a very short time interval.
c. A small force applied over a long time interval can produce a large change in the object's momentum.
d. A small force always produces a large change in the object's momentum.
A small force applied over a long time interval can produce a large change in the object's momentum.
A child with a mass of 23 kg rides a bike with a mass of 5.5 kg at a velocity of 4.5 m/s to the south. Compare the momentum of the child with the momentum of the bike.
The bike has a greater momentum than the child.
When comparing the momentum of two moving objects, which of the following is correct?
a. The object with the higher velocity will have less momentum if the masses are equal.
b. The more massive object will have less momentum if its velocity is greater.
c. The less massive object will have less momentum if the velocities are the same.
d. The more massive object will have less momentum if the velocities are the same.
The less massive object will have less momentum if the velocities are the same.
Which of the following situations is an example of a significant change in momentum?
a. a tennis ball is hit into a net.
b. A helium-filled balloon rises upward into the sky.
c. An airplane flies into some scattered white clouds.
d. A bicyclist rides over a leaf on the pavement.
a tennis ball is hit into a net.
Two objects stick together and move with a common velocity after colliding. Identify the typpe of collision.
Perfectly inelastic
A person sitting in a chair with wheels stands up, causing the chair to roll backward across the floor. The momentum of the chair
was zero while stationary and increased when the person stood.
A rubber ball moving at a speed of 5 m/s hit a flat wall and returned to the thrower at 5 m/s. The magnitude of the momentum of the rubber ball
remained the same
A soccer ball collides with another soccer ball at rest. The total momentum of the balls
remains constant
In an inelastic collision between two objects with unequal masses,
a. the total momentum of the system will increase.
b. the total momentum of the system will decrease.
c. the kinetic energy of one object will increase by the amount that the kinetic energy of the other object decreases.
d. the momentum of one object will increase by the amount that the momentum of the other object decreases.
the momentum of one object will increase by the amount that the momentum of the other object decreases.
A 75 ka person walking around a corner bumped into an 80 kg person who was running around the same corner. The momentum of the 80 kg person
decreased
A ball with a momentum of 4.0 kgg*m/s hits a wall and bounces straight back without losing any kinetic energy What is the change in the ball's momentum?
-8.0 kg*m/s
Two objects with different masses collide and bounce back after an elastic collision. Before the collision, two objects were moving at velocities equal in magnitude but opposite in direction. After the collision
the less massive object had gained momentum.
A child with a mass of 23 kg rides a bike with a mass of 5.5 kg at a velocity of 4.5 m/s to the south. Compare the momentum of the child with the momentum of the bike.
The child has a greater momentum than the bike.
Two swimmers relax close together on an air mattress in a pool. One swimmer's mass is 48 kg, and the other's mass is 55 kg. If the swimmers push away from each other
their momenta are equal but opposite.
A 5.68 x 10 kg tennis ball moves at a speed of 13 m/s. The ball is struck by a racket, causing it to rebound in the opposite direction at a speed of 18 m/s. What is the change in the ball's momentum?
1.8 kg*m/s
Each croquet ball in a set has a mass of 0.50 kg. The green ball travels at 10.5 m/s and strikes a stationary red ball. If the green ball stops moving, what is the final speed ofthe red ball after the collision?
10.5 m/s
A player at first base catches a throw traveling 38 m/s. The baseball, which has a mass of 0.145 kg, comes to a complete stop in the glove after 0.14 s. Assuming the force of the glove was uniform, what force did the glove exert on the ball?
39 N in the opposite direction
A 56.0-Kg diver strikes the water at a speed of 13.9 m/s, then slows to a stop underwater in 0.65 s. What force does the water exert on the diver?
1.2*10 N upward
Compare the momentum of a 5450 kg truck moving at 8.00 m/s to the momentum of a 2725 kg car moving at 16.0 m/s.
same momentum
An astronaut with a mass of 81 kg is outside a space capsule when the tether line breaks. To return to the capsule, the astronaut throws a 2.5 kg wrench away from the capsule at a speed of 16 m/s. At what speed does the astronaut move towards the capsule?
0.49 m/s
What velocity must a 1120 kg car have in order to have the same momentum as a 3360 kg truck traveling at a velocity of 16 m/s to the west?
48 m/s to the west
A pool cue strikes a 0.16 kg billiard ball with a force of 11 N. The cue remains in contact with the ball for 0.065s. The ball was initially at rest. What is the final speed of the ball?
4.5 m/s
A baseball bat strikes a baseball with a force of 37 N. The bat is in contact with the ball for 0.19 s. What is the magnitude of the change in momentum of the ball?
7.0 kg*m/s
A 19 g marble moves to the right at 3.4 m/s and makes an elastic head-on collision with a 27 g marble. The final velocity of the 19 g marble is 5.1 m/s to the left, and the final velocity of the 27 g marble is 2.8 m/s to the right. What was the initial velocity of the 27 g marble?
3.2 m/s to the left