WorksheetsImpulse and Momentum Review
Total questions: 25
Worksheet time: 53mins
Objects A and C are made of different materials, with different “springiness,” but they have the same mass and are initially at rest. When ball B collides with object A, the ball ends up at rest. When ball B is thrown with the same speed and collides with object C, the ball rebounds to the left. Compare the velocities of A and C after the collisions. Is vA greater than, equal to, or less than vC?
Va > Vc
Va = Vc
Va < Vc
An explosion in a rigid pipe shoots out three pieces. A 6 g piece comes out the right end. A 4 g piece comes out the left end with twice the speed of the 6 g piece. From which end does the third piece emerge?
The left end
The right end
It doesn't move because the two other pieces have equal momenta
The two particles are both moving to the right. Particle 1 catches up with particle 2 and collides with it. The particles stick together and continue on with velocity vf. Which of these statements is true?
vf is greater than v1.
vf = v1
vf is less than v2
vf = v2
vf is greater than v2 and less than v1
Impulse is
1. a force that is applied at a random time.
2. a force that is applied very suddenly.
3. the area under the force curve in a force-versus-time graph.
4. the time interval that a force lasts.
In an inelastic collision,
Momentum and Mechanical Energy are conserved
Only momentum is conserved
Only mechanical energy is conserved
Nothing is conserved
Which of the following is a unit of momentum?
N*s
N*m
Kg*m/s2
J
The engine of a rocket produces an average force of 150 N. Exhaust is emitted behind the rocket at 300 m/s for a total of 20 seconds. How much mass was emitted as exhaust?
0.5 kg
2 kg
2.5 kg
10 kg
Which of the following statements is/are true regarding collisions?
I - Momentum is conserved during all collisions involving isolated systems
II - Energy is only conserved during perfectly elastic collisions
III - Energy is only conserved during perfectly inelastic collisions
I only
II only
III only
I and II only
I and III only
A 2 kg box traveling at 12 m/s collides with a stationary 6 kg cart. If the two carts stick together after the collision, what is their final velocity?
1 m/s
2 m/s
3 m/s
4 m/s
A 100 kg football linebacker moving at 2.0 m/s away from the goal line tackles head-on an 80-kg halfback running 3.0 m/s towards the goal line. The collision is inelastic. Neglecting the effects due to digging in of cleats and hitting low/high, who will win the collision?
The players will tie -- and stop in place
The 100 kg player will drive the 80 kg player backwards
The 80 kg player will drive the 100 kg player backwards
They will rebound so that the 100 kg player moves at 3m/s and the 80 kg player moves at 2 m/s, so the 80 kg player wins.
In a collision between two objects of unequal masses, what is the unequal for each of the objects?
The force on each object will be different
The acceleration of each object will be different
The impulse on each object will be different
The change in momentum of each object will be different
You are standing on a skateboard, initially at rest. A friend throws a very heavy ball toward you. What should you do when the ball reaches you if you want to maximize your speed on the skateboard?
Deflect the ball down
Deflect the ball back the way it came
Deflect the ball up
Catch the ball
What has more momentum - a 7,000 kg truck at rest, or a 3 gram bug moving at 4 m/s?
The bug
The truck
They have the same momentum
Airbags make collisions safer because they help decrease which of the following in a collision?
The impulse on the car
The impulse on the passenger
The time of the collision by increasing the force
The net force on the passenger by increasing the time
A child throws a ball upward at 30 m/s. About how fast is the ball going 4 seconds later, and in what direction?
Assume g = 10N/kg
0 m/s
10 m/s
-10 m/s
70 m/s
A shopping cart filled with watermelons rolls along a level surface. One of the watermelons rolls off of the stack and falls to the ground behind the cart. Ignore friction. The shopping cart will
Speed up
Slow down
Stop immediately
Keep going its initial speed
Two balls of clay, each having a mass of 2 kg, are thrown directly towards each other at 20 m/s and stick together. What is the new velocity of the two balls of clay system?
0 m/s
10 m/s
20 m/s
40 m/s
The following graph shows force as a function of time acting on a system. According to the graph shown in the image, what is the impulse imparted on the system?
10 N*s
33 N*s
45 N*s
90 N*s
A continuous force is acting on a block that is on a frictionless surface. After the force has acted on the block for some time, the speed of the block has increased a certain amount.
1. If the force and mass of the block are unchanged, but the time the force acts is doubled, the increase in speed will be:
Unchanged
Doubled
Tripled
Increased by four
Decreased by half
A continuous force is acting on a block that is on a frictionless surface. After the force has acted on the block for some time, the speed of the block has increased a certain amount.
2. Next, if the force and action time are unchanged, but the mass of the block is doubled, then the speed increase will be
Unchanged
Doubled
Tripled
Increased by four
Decreased by half
A continuous force is acting on a block that is on a frictionless surface. After the force has acted on the block for some time, the speed of the block has increased a certain amount.
3.Now suppose that only the force is doubled while the mass and action time are unchanged. Then the increase in speed will be
Unchanged
Doubled
Tripled
Increased by four
Decreased by half
A continuous force is acting on a block that is on a frictionless surface. After the force has acted on the block for some time, the speed of the block has increased a certain amount.
4. Finally, suppose the applied force, mass, and action time are all as they were initially, but somehow the force of gravity is doubled (i.e. the experiment were carried out on another planet). Then the increase in speed will be
Unchanged
Doubled
Tripled
Increased by four
Decreased by half
Which of the following is an accurate statement?
If an object's speed is doubled, then the momentum and kinetic energy will double, too
If an object is acted upon by a non-zero net force, then the momentum of the object will not remain constant
The momentum of a projectile is constant
The momentum of a moving object must remain constant
A bug and the windshield of a fast moving car collide.
Which of the following statements are true? (select all that apply)
The force of the bug on the windshield and the force of the windshield on the bug are equal in magnitude.
The impulse on the bug from the windshield and the impulse on the windshield from the bug are equal in magnitude
The change in the speed of the bug and the change in the speed of the car are equal in magnitude
The change in the momentum of the bug and the change of the momentum of the car are equal in magnitude
The graph of F vs t shown is for the force acting on a 2 kg object. What, if any, is the change in the velocity of the object from 1 second to 5 seconds?
0 m/s
2 m/s
3 m/s
4 m/s
6 m/s
