If the sliding friction between two surfaces is found to be 8N, then the static friction between these two surfaces is most likely to be:
(a) 5N
(b) 10N
(c) 4 N
(d) 2N

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Solution

Answer: (b) 10N
Friction is a contact force that resists motion once an object is rubbed against another. Static friction is between two objects that don't seem to be moving. Sliding friction is between two objects once one or each is sliding against one another. Sliding friction is lesser than static friction.
Thus, static friction should be greater than the sliding friction of 8 N i.e.; 10 N.

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If the sliding friction between two surfaces is found to be 8N, then the static friction between these two surfaces is most likely to be: (a) 5N (b) 10N (c) 4 N (d) 2N

If the sliding friction between two surfaces is found to be 8N, then the static friction between these two surfaces is most likely to be:
(a) 5N
(b) 10N
(c) 4 N
(d) 2N