Dynamics
On which factors force of friction depends?
The roughness of the contact surface and the weight of the object that moves.
What happens to the moticn of an object when the forces on it are balanced?
If it is static, it will stay static. If it is in motion, it will continue to move in the same direction and at the same speed. (Newton's first law).
A sailing boat has a forwards force of 300 N from lhe wind in its saiIs. It is travelling at a constant speed. What is the total force acting on Ihe sailing boat? Explain your answer.
It is travelling with constant speed, which means that a net (resultant) force does not act on an object (Newton first law). Therefore Ft=0 N.