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Question

A spring balance was used to measure the force needed to pull a wooden block across different floor surfaces. This table below shows the results. The force is expressed in Newton.
Floor surface Force needed to start
moving
carpet 8 N
glazed tiles 5 N
polished wood 4 N
doormat 10 N

A. If the block is pulled on the wooden surface with a force of 4.1 N
(a) the block just starts to move.
(b) the block does not move.
(c) the block starts moving smoothly.
(d) the block moves a bit and stops.
B. In which of the above surfaces is the friction greatest?
(a) carpet
(b) glazed tiles
(c) polished wood
(d) doormat

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Solution

A. (a) the block just starts to move

If the block is pulled on the wooden surface with a force of 4.1 N, it just starts to move.

B. (d) doormat
On the doormat, the friction will be greatest.

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