The topic here is contact and non-contact forces. Four forces are offered as choices.
01[1 mark]
Pick the force that only acts when two objects are touching.
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Electrostatic force between two charges
Friction between two surfaces
Gravity pulling two masses together
Magnetic force from a magnet
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Friction is the right choice. It acts where two surfaces touch and rub, so it is a contact force. The electrostatic, gravitational and magnetic forces all act across a gap with nothing touching, so they are non-contact forces and each one fails.
1 mark
How the marks are earned
- Choose friction between two surfaces, because it acts only where objects touch.
- One answer only: two answers earn nothing, and a circled or underlined right option counts if the box is blank.