Forces and their effects - Three and four mark questions

These are similar to one and two mark questions but you will be expected to write in more depth for three and four mark questions.

Three and four mark questions usually require longer answers.

Edexcel questions courtesy of Pearson Education Ltd.

Sample question 1 - Foundation and Higher


The diagram shows the apparatus used to investigate moments. The 2 N weight is placed 60 cm from the pivot. The newtonmeter is placed 10 cm from the pivot.

A ruler is clamped with a 2 newton weight on the far end, and a Newton meter attached to the clamped end.

The metre ruler is replaced by an iron bar. The iron bar is 1 m long and has a weight of 10 N. The newtonmeter and the 2 N weight stay in their original position. Explain how this change affects the reading on the newtonmeter. [3 marks]

The reading increases because the weight of the bar causes a greater moment in the same direction as the 2 N weight than the moment caused by the (lighter) ruler.

Sample question 2 - Higher


The diagram below shows the glider at rest on the air track. Complete the diagram to show the forces acting on the glider. Label the forces. One force arrow has been drawn for you.

A glider is on an air track. The air track is a triangular shape with holes down the side for air, the glider rests on this. There is an upwards arrow from the glider.
A glider is on an air track. There is an upwards arrow from the glider labelled lift, and a downwards arrow labelled weight.

Make sure the arrows are the same length.