5
A metal ball is dropped into a tall cylinder of oil. The ball initially accelerates
but soon reaches a terminal velocity.
a
6
7
b
By considering the forces on the metal ball bearing, explain why it first
accelerates but then reaches terminal velocity.
a
b
C
State how you would show that the metal ball reaches terminal velocity.
Suggest one cause of random errors in your readings.
Determine the speed in m s-1 of an object that travels:
3.0 μm in 5.0 ms
6.0 km in 3.0 Ms
8.0 pm in 4.0 ns.
This diagram shows a man who is just supporting the weight of a box. Two of
the forces acting are shown in the diagram. According to Newton's third law,
each of these forces is paired with another force.
