WorksheetsUnit 3: Momentum Review
Total questions: 46
Worksheet time: 3hrs 58mins
A car crashes into a wall and comes to a complete stop. How could the force experienced by the passengers be decreased?
Decreasing the time it takes the car to come to a complete stop
Increasing the time it takes for the car to come to a complete stop
Braking at the last second really fast
Just make sure all passengers wear their seat belt
Which of the following is a type of collision where kinetic energy is conserved?
Perfectly elastic
Inelastic collision
Explosions
None of the above
A van fails to stop and hits a stationary car, and they move forwards together. Is this an elastic or inelastic collision?
It is an inelastic collision because the vehicles move together after the collision.
It is an elastic collision because both vehicles move separately after the collision.
It is an elastic collision because kinetic energy is conserved.
It is an inelastic collision because no energy is lost.
A 4 kg ball is moving at 1 m/s. It then experiences an impulse of - 5 N·s. What is the final momentum of the system?
4 kg·m/s
-4 kg·m/s
1 kg·m/s
-1 kg·m/s
A 4 kg ball is moving at 1 m/s. It then experiences an impulse of - 5 N·s. What is the final velocity of the 4 kg ball?
1 m/s
-1 m/s
-0.25 m/s
0.25 m/s
The impulse-momentum theorem states that
the impulse on an object is equal to the change in momentum it causes
the force on a moving object is equal to the magnitude of the impulse.
the impulse on an object is greater than the change in momentum it causes
the impulse on an object is less than the change in momentum it causes
Which takes more force to catch, a bowling ball or a ping pong ball?
bowling ball because it has more momentum
ping pong ball because it has more momentum
both require the same amount of force when catching
bowling ball because it has less momentum
A boy kicks a football with a force of 20 N, the time the force acts for is 0.3 s. Calculate the impulse on the ball.
1 N·s
6 N·s
33.3 N·s
None of these
A 0.250 kg cart moving at 0.400 m/s has how much momentum?
0.1 kg·m/s
1 kg·m/s
10 kg·m/s
5 kg·m/s
If 2 objects collide and stick together, what will happen to their velocities?
velocities will increase
velocities will decrease
velocities will stay the same
none of the above
The difference between a car hitting a wall vs. a car hitting a hay stack is
the impulse on the car hitting the wall is greater
the change in momentum of the car hitting the wall is greater
the force on the car hitting the hay stack is greater
the collision time of the car hitting the hay stack is greater
Which object has the greater momentum?
0.25 kg, 45 m/s
1.5 kg, 8 m/s
Two ice skaters push off from each other and move in opposite directions. What principle explains their motion?
Newton's first law
Conservation of energy
Impulse-momentum theorem
Conservation of momentum
Which of the following best describes an elastic collision?
Neither momentum nor kinetic energy is conserved
Only momentum is conserved
Both momentum and kinetic energy are conserved
Only kinetic energy is conserved
Which of the following best explains why airbags are used in cars?
They make the car heavier, reducing its speed
They increase the time over which the collision occurs, reducing the force on the passenger
They increase the force on the passenger during a collision
They decrease the time of collision, increasing the impulse
Which of the following has the MOST momentum?
rolling ping-pong ball
rolling bowling ball
rolling soccer ball
rolling basketball
If an object has a mass of 20 kg and a velocity of 4 m/s, what is the momentum of the object?
80 kgm/s
4 kgm/s
5 kgm/s
.2 kgm/s
Joe is trying to tackle Carson while Carson is standing still. Joe is running at 15 m/s and has a mass of 32 kg. Carson has a mass of 64 kg. What is their final velocity, assuming this is a perfectly inelastic collision? (do not write units)
(a)
What is an elastic collision?
An elastic collision is an encounter between two bodies in which the total kinetic energy of the two bodies is different.
An elastic collision is an encounter between two bodies in which the total kinetic energy of the two bodies remains the same.
An inelastic collision is an encounter between two bodies in which the total kinetic energy of the two bodies remains the same.
What is an inelastic collision?
When two objects collide, becoming stuck together and internal kinetic energy is lost (but not really lost, it transfers to different forms of energy)
When two objects collide, becoming stuck together and internal kinetic energy is lost
When two objects don't collide, becoming stuck together and internal kinetic energy is lost (but not really lost, it transfers to different forms of energy)
An Elephant is running at a velocity of 14 m/s. He has a mass of 6,300 kg. What is the elephants momentum? Do not write units.
(a)
What is the equation for momementum?
p=m×v
p=m×a
p=f÷a
m=p×v
If an object has a big mass, how will that effect it's momentum?
Make it smaller
It has no effect
Make it bigger
If an object is moving very slowly how does that effect it's momentum?
Makes it larger
Makes it the same
Makes it smaller
What is the definition of momentum?
the quantity of motion of a moving body, measured as a product of its mass and acceleration.
the quality of motion of a moving body, measured as a product of its mass and velocity.
the quantity of motion of a moving body, measured as a product of its gravity and velocity.
the quantity of motion of a moving body, measured as a product of its mass and velocity.
A car runs the red light and strikes and sticks to a car of similar size and build crossing the intersection.
elastic collision
inelastic collision
A cart in the grocery store parking lot is caught by the wind and blown into a parked truck, which dents the truck’s passenger door.
elastic collision
inelastic collision
A car crosses the center line and strikes a car head-on that was travelling in the opposite direction. The cars bounce back on impact. The velocity of the cars prior to the collision is equal to their velocities after the collision.
elastic collision
inelastic collision
During a game of billiards (table pool), a player takes their turn and makes a final shot. The cue ball strikes the eight ball and stops moving while the eight ball is sunk into the pocket. The balls have the same mass and the velocity of the cue ball before the collision is equal to the velocity of the 8 ball after the collision.
elastic collision
inelastic collision
A kid throws a bouncy ball to send it at the wall, and the ball bounces and returns.
elastic collision
inelastic collision
A kid throws a ball of clay to send it at the wall, and the clay strikes the wall and just drops straight to the floor after a second.
elastic collision
inelastic collision
In the equation p = mv
p=impulse
p=force
p=acceleration
p=momentum
The Law of conservation of momentum states that if interacting objects in a system are not acted on by outside forces, the total amount of momentum in the system
can not change
will change according to the mass
can change only if the force remains constant
can not change if there is acceleration
A 4,000 kg pick-up truck uses a braking force of 15,000 newtons (N) to stop in 6 seconds. What is the Impulse?
(Impulse = F x Time)
Impulse = 3.75
Impulse = 90,000
Impulse = 24,000
Impulse = 2,500
A 75 kg high jumper lands on the mat after her jump. The mat brings her to a stop after 1.5 seconds. She was traveling at 6.5 m/s when she landed on the mat. Note: The speed of the jumper was 0 m/s at the top of her jump, before she started to fall towards the mat.
What was the Force felt by the jumper upon impact with the mat?
(F= mass x acceleration)
Force=487.5 N
Force = 11.5 N
Force =1 N
Force =500 N
