CIE IGCSE Physics

Topic Questions

IGCSEPhysicsCIETopic Questions1. Motion, Forces & Energy1.6 Momentum

1.6 Momentum

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11 mark

Extended

Which of these is the correct definition for momentum and its unit?

 

Definition

Unit

A

p = m ÷ v

N/m

B

v = p × m

kgm/s

C

v = p ÷ m

N/kg

D

p = m × v

kgm/s

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21 mark

Extended

 

Which of the following terms and equations are equivalent to the change in an object's momentum?

 

 Term

Equation

A.

 Force F space equals I over t

B.

 Impulse I space equals space F t

C.

 Force F space equals space m a

D.

 Impulse I space equals space fraction numerator increment p over denominator t end fraction

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31 mark

Extended

 

A ball with mass of 5.0 kg is moving with a velocity of 3.0 m/s.

What is the momentum of the ball?

  • 0.6 kg m/s

  • 1.70 kg m/s

  • 15 kg m/s

  • 15 000 kg m/s

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41 mark

Extended

 

A ball which has momentum = 30 kg m/s hits a stationary ball with momentum = 0  kg m/s so that they both move off. 

What is the total momentum of the two balls following the collision?

  • 0  kg m/s

  • 3  kg m/s

  • − 30  kg m/s

  • 30  kg m/s

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51 mark

Extended

 

A footballer kicks a ball with a force of 1500 N. Her foot is in contact with the ball for 1.4 seconds. 

What is the impulse on the ball?

  • 1070 Ns

  • 2100 Ns

  • 3000 Ns

  • 4200 Ns

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11 mark

Extended

A dummy is used in a crash test to investigate the safety of a new car. The deceleration of the dummy and the passenger compartment is measured.

q1-hard-mcq-1-6--momentum-cie-igcse-physics

The deceleration of the dummy is less than the deceleration of the passenger compartment. 

Why is this of benefit for the safety of the passenger?

  • Seat belts, crumple zones and airbags all absorb energy from the crash

  • The crash happens quickly so the passenger doesn’t feel anything

  • The force of impact on the passenger, and therefore harm, is reduced

  • The time over which the collision happens is elongated for the passenger

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21 mark

Extended

A passenger of mass 90 kg is involved in a minor car crash.

q2-hard-mcq-1-6--momentum-cie-igcse-physics

The car approaches a solid barrier at 32 m/s. It crashes into the barrier and stops in 0.2s.

Determine the impulse that must be applied to the car to bring it to rest.

  • 2.8 Ns

  • 14 Ns

  • 580 Ns

  • 2900 Ns

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31 mark

Extended

An object of mass 150 kg accelerates from a velocity of 5 m/s to a velocity of 10 m/s in the same direction.

What is the impulse provided to cause this acceleration?

  • 750 Ns

  • 1500 Ns

  • 2250 Ns

  • 7500 Ns

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41 mark

Extended

During a paintball fight, a paint pellet of mass 150g hits a stationary target with a speed of 220m/s. It takes 0.025s from the moment the pellet comes into contact with the wall until it flattens onto the wall.

What is the force exerted as a result of the paintball “splat”?

  • 1.3 x 103 N

  • 33 N

  • 1.3 x 106 N

  • 33 x 103 N

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11 mark

Extended

A rollercoaster speeds along a track with considerable momentum. 

If a different rollercoaster travels at four times the speed but has half as much mass, its momentum is would be:

  • Zero

  • Twice as much

  • Four times as much

  • Unchanged

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21 mark

Extended

A bullet is shot from a gun. The bullet moves forward and the gun moves in the opposite direction. Which of the following statements is true?

  • They move with the same velocity in opposite directions.

  • The bullet moves with a slower velocity due to its mass.

  • The total momentum of the system is zero.

  • The total momentum of the system does not stay constant before and after the collision.

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31 mark

Extended

A gas molecule strikes the wall of a container with a speed of 200m/s. It rebounds with the same kinetic energy as it had before striking the wall.

q3-medium-mcq-1-6--momentum-cie-igcse-physics

What is its final velocity?

  • 100 m/s

  • - 100 m/s

  • 200 m/s

  • - 200 m/s

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41 mark

Extended

Padded dashboards in cars are safer in an accident than non-padded ones because a passenger hitting the dashboard would experience

  • Lengthened time of contact

  • Shorter time of contact

  • Decreased impulse

  • Increased momentum

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51 mark

Extended

After a car crash the car driver's airbag inflates. The airbag then deflates when it is hit by the driver’s head. 

How does an airbag reduce the risk of injury?

  • Collision time increases, which increases the rate of change of momentum.

  • Collision time increases, which reduces the rate of change of momentum.

  • Collision time decreases, which increases the rate of change of momentum.

  • Collision time decreases, which reduces the rate of change of momentum .

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