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9 Forces and their effects

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Question 25
F

A steel paper clip is tied to a thread. The other end of the thread is taped to a bench.

A magnet is held above the paper clip so that the paper clip stays in the air without touching the magnet.

The Figure shows the apparatus.

Figure

image

a.

Name the force that the magnet exerts on the paper clip. State whether it is a contact force or a non-contact force.

[2]
b.

Give the force that forms an interaction pair with the force that the magnet exerts on the paper clip. Give its direction.

[2]
c.

The student slowly moves the magnet upwards, away from the paper clip.

The paper clip falls onto the bench.

Explain why.

[2]
d.

The student replaces the paper clip with a small piece of aluminium foil of the same weight.

Explain why the foil cannot be held in the air in the same way.

[2]
Markscheme

9 Forces and their effects Questions

  1. GCSE
  2. /Physics
  3. /9 Forces and their effects

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