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Forces and Motion Practice

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📚 Part 1: Calculation Questions (AQA style)

Show all working. Use g = 9.8 m/s² where needed. Use equations of motion and Newton’s laws.

1. A car increases its speed from 5.0 m/s to 25.0 m/s in 8.0 s. Calculate:

a) the acceleration of the car (m/s²),

b) the distance travelled during this acceleration (m).

2. A lorry of mass 1 200 kg experiences a resultant forward force of 2 400 N. Calculate the acceleration of the lorry. State your answer in m/s².

3. A skydiver of mass 80 kg is falling. At one moment the drag force acting upwards is 500 N.

a) Calculate the weight of the skydiver (N).

b) Find the resultant force at that moment and state whether the skydiver is accelerating upwards, downwards or at terminal velocity. Calculate the acceleration (m/s²).

4. A pupil pushes a 5.0 kg trolley across a horizontal surface with a horizontal force of 30 N. Friction opposes motion with a force of 12 N.

a) Calculate the resultant force on the trolley (N).

b) Calculate the acceleration of the trolley (m/s²).

5. A ball is thrown vertically upwards with an initial speed of 18 m/s. Using v² = u² + 2as, calculate the maximum height reached (m).

📝 Part 2: Multiple Choice & Short Answer

6. Which single statement best describes terminal velocity?

The speed at which gravity is zero.

The speed at which drag equals the weight and resultant force is zero.

The maximum speed an object can ever reach in vacuum.

The speed when friction is at its maximum value.

7. Which of the following are contact forces? (Tick all that apply.)

Air resistance

Gravity

Friction between tyres and road

Tension in a rope

8. A student draws a force diagram for a box sitting on a floor. Which pair of forces must be equal and opposite if the box remains at rest?

Weight and applied push

Weight and normal contact force from the floor

Friction and air resistance

Tension and thrust

9. Explain briefly: If two objects of different masses experience the same resultant horizontal force, what happens to their accelerations? (1–2 sentences)