Physics January Revision

A 5 kg box is pulled by a horizontal force of 5 N on the floor. The friction between the floor and the box is 2 N, calculate the acceleration of the box. [Type the magnitude of the answer]

It is given that the resultant force acting on an object is 0 m s ^-2. Which of the following describes the motion of the object? [Answer may more than one]

• The box remains stationary

• The box is moving at increasing acceleration

• The box is moving at zero acceleration

• The box is moving at constant velocity

The diagram shows a 4 kg block on a ramp of 30⁰. Given that the friction between the ramp and the block is 20 N. Calculate the acceleration of the block, in m s ^-2.

The diagram shows a block on the frictionless ramp, draw the free body diagram of the block in the diagram given. [Hints: There's at least 2 arrows]

A man stands on a weighing scale in a lift. In which scenario will the reading of the weighing scale is 0 N?

• The lift moves at constant velocity

• The lift moves upwards with acceleration

• The lift moves downwards with acceleration

• The lift remains stationary

• The lift is experiencing free fall