1. The diagram shows
the electromagnet just above an iron rod, which is pivoted at one end. A box is
hanging from the other end.
a) What is the mass of the box?
b) What is the force produced by the electromagnet?
2. A beam of wood is balanced on a brick. A girl stands at a point 50 cm from the centre. Ten 2 kg masses are placed on
the plank 2.5 m from the centre on the
opposite side and the beam balances. What is the mass of the girl?
3. Henry uses the light seesaw shown below to measure Mary's
mass.
Use the information in the diagram to
calculate Mary's mass. Show your working.
4. An
empty wheelbarrow, which weighs 65.5 N. The operator pulls upwards on the handles
with a force of 20 N to keep the handles horizontal. The point marked M is the
centre of mass of the wheelbarrow.
Determine: the distance between points A and M.
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