Question

A force of 25N causes an acceleration of 2m/s^2 when acting on a 7kg mass. What is the frictional force also acting?

If body is moving then frictional force is at its maximum. acceleration in direction of friction is -2
M=7. a=-2
F= frictional force opposing movement
F=Ma F= 7x-2 = -14
Therefore the frictional force is 14 N


thanks for that

Answer 1

The force of friction is equal to the force of the applied force minus the net force. The net force is the force of the applied force divided by the mass, giving a net force of 25N/7kg = <<25/7=3.57>>3.57N.
The force of friction is 25N - 3.57N = <<25-3.57=21.43>>21.43N. Answer: \boxed{21.43}.