Question

It is easier to open a bottle cap by gripping it with a towel.
Explain in brief 2 ways by which this force can be increased and reduced.

Answer 1

Answer:

I think this may be correct answer

Explanation:

It is easier to open a bottle cap by gripping it with a towal because the towel as well as the cap if the bottle has rough surface. The irregularities between the two surfaces causes the object to interlock and cause friction. The friction does not let our hand slip off.

Answer 2

Answer:

1) Rough surface of towel helps in increasing friction and thus provides a better grip. The towel thus makes it easier to open the bottle cap.

a)To reduce friction we can make the surfaces in contact smooth.

• Also adding a lubricant to two surfaces in contact reduces friction between them.
• Grease is added between the moving parts in machines, to reduce friction.
• Another method of reducing friction is by using bearings. When ball bearings are introduced between two surfaces friction is reduced because of the freely rotating metal balls.

b)To increase friction, the surfaces in contact have to be made rough.

• The two surfaces in contact can also be pressed harder to increase force between them.
• Use of adhesive materials that stick surfaces , also increases friction between them.

Explanation:

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