A body weighing 200 N is resting on a rough horizontal plane and can be just moved by a force of 65 N applied horizontally. Find coefficient of friction. Also find magnitude & direction of the resultant reaction.
Answers
Answer:
In this simple case of an object sitting on a horizontal surface, the normal force will be equal to the force of gravity F n = m g F_n=mg Fn=mgF, start subscript, n, end subscript, equals, m, g.
Answer:
A 5 kg box on a horizontal table is pushed by a horizontal force
of 15 N as shown on the right.
If the coefficient of friction is 0.4, will the box move?
Think about
What is the smallest force that could make the box slide along the table?
Solution
The sketch shows the forces acting on the box.
Note that the weight of a box of mass 5 kg is 5g where g = 9.8 ms–2
Since the vertical forces are in equilibrium, R = 5g
Therefore the maximum possible friction is F = μR = 0.4 5g = 19.6 N
The pushing force, 15 N, is less than this and so cannot overcome the
friction.
The box will not move
Explanation: