Complete the following sentences using words from the box below.
electrostatic | friction | gravitational | magnetic |
i) The force that keeps the Earth in orbit around the sun is ......................................................................... attraction.
[1]
ii) The force that opposes motion between two surfaces is .............................................................................
[1]
iii) The force that can move small pieces of paper towards a plastic comb is .............................................................attraction.
[1]
Which of these statements is true for a vector quantity?
It has size only
It has direction only
It has direction and size
It does not have direction or size
Figure 3 shows a force of 200 N acting at the end of a plank of wood.
The force acts at right angles to the plank and at 3.0 m away from a pivot.

Figure 3
Calculate the moment of the 200 N force about the pivot.
State the unit of the moment of the force.
Use the equation
moment of a force = force × distance at right angles to the direction of the force
moment of the force about the pivot = ................. unit ........
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