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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Floor surface	Force needed to start moving
carpet	8 N
glazed tiles	5 N
polished wood	4 N
doormat	10 N

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.

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.