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Unit summary

Revise!

1. Compare the rolling friction in these images: 3. The upthrust of this airplane is 31 kN and its mass
is 3 tonnes. Show the forces acting on the plane.
What is the resultant force of these forces?
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4. 1 N, 3 N, 5 N and 7 N forces act on an object
on one line. Consider possible variations in
the direction of the forces. Draw these forces
graphically in a diagram. Define the magnitude
of the resultant force of these forces and
their direction.

2. What is the reading on the dynamometer?

150 N

?

100 N

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