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Which of these is an example of a non-contact force?
Two friends find it hard to start moving a heavy almirah, but once it starts sliding it is easier to keep it moving. The reason is:
Classify each force as contact or non-contact: (a) a player kicking a football (b) the Earth pulling a falling mango (c) a magnet pulling a steel paper clip from a distance (d) friction slowing down a rolling bicycle.
What is muscular force? Give two examples from daily life and state whether it is a contact or non-contact force.
In an activity, a wooden block is pulled with a spring balance across three surfaces. The reading just as the block starts to move is: glass sheet 2 N, wooden table 3.5 N, sandpaper 6 N. (a) On which surface is friction greatest? (b) Arrange the surfaces in increasing order of friction. (c) What do you conclude about friction?
A box on a rough floor is pushed with a force of 15 N, as shown in the figure, but it does not move. (a) What is the size and direction of the friction on the box? Name this friction. (b) The push is then increased to 25 N and the box starts sliding. The sliding friction is now 20 N. Find the net force on the box and its direction.
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