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ASPhysicsOCRExam Questions3. Forces & Motion3.3 Dynamics

Dynamics (OCR AS Physics)

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3.3 Dynamics

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3.3 Dynamics

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11 mark

A paper cone is held above the ground and dropped. It falls vertically and reaches terminal velocity before it hits the ground.

q2-h556-01-qp-june-2019-ocr-a-level-physics

Which statement correctly describes the resultant force on the falling cone before it reaches terminal velocity?

  • decreasing and upwards

  • decreasing and downwards

  • increasing and downwards

  • increasing and upwards

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21 mark

A tennis ball is hit with a racket. The force applied by the racket on the ball is F. The ball has a vertical path through the air.

Which statement is correct when the ball is at its maximum height?

  • The ball has a downward acceleration.

  • The force acting on the ball is F.

  • The ball experiences greatest drag.

  • The weight of the ball is equal to the drag.

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1
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An object is dropped from rest at time t = 0. It falls vertically through the air.

The variation of the velocity v with time t is shown below.

q12-paper-1-june-2018-ocr-a-level-physics

Which statement is correct about this object?

  • It has constant acceleration.

  • It experiences zero drag at t = 30 s.

  • It has an acceleration of 9.81 m s−2 at t = 0 s.

  • It travels the same distance in every successive 10 s.

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2
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A ball of mass m is falling vertically through the air.

q14-paper-1-nov-2021-ocr-a-level-physics

The total upward force acting on the ball is F. The force F is less than the weight of the object. The acceleration of free fall is g.

Which expression is correct for the acceleration a of the ball?

  • a space equals space 0

  • a space equals space fraction numerator m g space minus space F over denominator m end fraction

  • a space equals space fraction numerator m g space plus space F over denominator m end fraction

  • a space equals space g

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3
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The diagram below shows a 600 g wooden block that is placed on a smooth surface which makes an angle of 20° to the horizontal.

3-3-mcq-m-q3-ocr-al-physics

What is the acceleration of the block as it moves down the surface?

  • 2.0 m s-2

  • 5.5 m s-2

  • 3.4 m s-2

  • 9.2 m s-2

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4
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A car has mass, m, and has constant positive acceleration, a. It experiences a resistive force, R, and has a driving force, F.

Which of the following statements are true?

  1. The resistive force on the car is greater than the driving force
  2. The driving force of the car is greater than the resultant force
  3. The acceleration of the car is equal to fraction numerator F minus R over denominator m end fraction
  4. The resultant force of the car is equal to F - R - mg

  • 1 and 4

  • 2 and 3

  • 2, 3 and 4

  • Only 3

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5
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The Lunar Rover had a weight of 2060 N on the Earth and the weight on the Moon was  342 N.

What is the acceleration of free fall on the Moon?

  • 9.81 m s−2

  • 1.63 m s−2

  • 6.02 m s−2

  • 16.0 m s−2

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1
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A trolley of mass M is pulled along a horizontal table by a force W provided by a mass hanging from the end of a string as shown.

q10-paper-1-june-2018-ocr-a-level-physics

Frictional forces are negligible. The acceleration of free fall is g.

What is the correct equation for the acceleration a of the trolley?

  • a = W over M

  • a = g

  • a = W over italic 2 M

  • a = fraction numerator W over denominator M space plus W over g end fraction

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2
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The diagram shows two opposite vertical forces of magnitude 1.2 N and 2.1 N acting on an object.

q8-paper-1-june-2017-ocr-a-level-physics

Which of the following statements could be correct?

1    The object is accelerating and moving up.
2    The object is decelerating and moving down.
3    The magnitude of the resultant force is 0.9 N.

  • Only 3

  • Only 1 and 3

  • Only 2 and 3

  • 1, 2 and 3

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3
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Below is a table of values for the drag force D and the velocity v a skydiver experiences where: D ∝ v2.

What is the velocity of the skydiver when they experience a drag force of 56 N?

Drag force (N)

Velocity (m s-1)

100

20

225

30

  • 17 m s-1

  • 3.3 m s-1

  • 2.7 m s-1

  • 15 m s-1

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4
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A lift has a mass of 600 kg, which is suspended from a cable with a tension of 5600 N. The lift starts at rest and accelerates downwards at a constant rate for 7 s.

How far does the lift travel?

  • 23 m

  • 12 m

  • 470 m

  • 1.7 m

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5
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A 50,000 year old crater found in the Arizona desert is 170 m deep. It was formed by a meteorite that had a mass of 3.0 × 108 kg and an initial impact speed of 1.3 × 104 m s-1.

Assuming that the meteorite was under constant acceleration, which one of the following statements are true?

  • The average force from the Earth which acted on the meteorite was 1.5 × 1014 N

  • The average force exerted by the Earth was greater than the average force exerted by the meteorite

  • The average force from the meteorite which acted on the Earth was 2.9 × 109 N

  • The average force exerted by the meteorite was greater than the average force exerted by the Earth

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