11. Exercises

As a ball bounces on a table, the table exerts a upward normal reaction force on the ball. Describe the reaction to this force..

A beam rests in equilibrium on two supports.

a) Draw a diagram to show the forces that act on the beam.

b) What can you deduce about the forces that the beam exerts on the supports?

A ball is dropped and bounces on a horizontal surface. Describe how the force that the surface exerts on the ball varies during the bounce. Also describe how the force that the surface exerts on the ball varies.

A concrete block, of mass 5 kg, is placed in a bucket of mass 1 kg. A rope is used to pull the bucket vertically upwards. At one point the block and bucket accelerate upwards at 0.2 \displaystyle \text{m}{{\text{s}}^{-2}}.

a) Find the tension in the rope.

b) Find the magnitudes of the forces that the bucket exerts on the concrete block.

c) State the magnitude of the force that the block exerts on the bucket.

Two carriages are coupled to an engine. The engine and carriages move on a set of straight, horizontal railway lines.

Draw a diagram to show the forces acting on the engine and the carriages.