Revision - MCQ Questions Unit 1 and 2

Which of the following quantities has the SI base units kgm² s⁻³?

• force

• momentum

• power

• work done

Which of the following statements describes the gravitational field strength acting on a body at a point?

• gravitational force per unit length

• gravitational force per unit mass

• gravitational potential energy per unit length

• gravitational potential energy per unit mass

The diagrams below show the velocity of an object before and after a force is applied. The magnitude of the velocity did not change.

• A

• B

• C

• D

A ball of mass m is projected vertically upwards. An air resistance F acts on the ball at all times. Which of the following equations would apply to the ball as it is travelling upwards?

• mg − F = 0

• mg + F = 0

• mg − F = ma

• mg + F = ma

Two objects P and Q are at the same position at time t = 0s. The graphs show how the velocity v varies with time t for each object. Which of the following statements describes the positions of P and Q at t = 4s?

• P and Q are both at the initial position.

• P and Q are the same distance from the initial position.

• P is further from the initial position than Q.

• Q is further from the initial position than P.

A ball is travelling horizontally at a speed of 7.0ms⁻¹. The ball hits a vertical wall and rebounds along its initial path at a speed of 5.0ms⁻¹. The ball has an acceleration of 300ms⁻² while in contact with the wall. Which of the following expressions gives the time of contact t between the ball and the wall?

• A

• B

• C

• D

Trolleys X and Y of masses m and 3m respectively are travelling at the same speed towards each other. The trolleys collide and move off together. Which of the following statements is correct?

• The force of X on Y during the collision is greater than the force of Y on X.

• The force of X on Y during the collision is less than the force of Y on X.

• The speed of X after the collision is greater than v.

• The speed of X after the collision is less than v.

A motor with an efficiency of 68% is used to raise a load of 350N through a height of 25m. Which of the following expressions gives the energy supplied to the motor?

A length of steel wire is fixed at one end. An increasing force is applied to the other end of the wire. The force extension graph for the wire is shown.

• A

• B

• C

• D

Some students were shown a velocity-time graph for the motion of an object falling through a liquid. The students suggested possible explanations for the decrease in gradient of the graph. Which explanation could be a reason for the gradient of the graph decreasing?

• The drag force increases.

• The gravitational force increases.

• The temperature of the liquid increases.

• The upthrust on the object decreases.