a block rests on a horizontal surface. the normal force is 20N. the coefficient of static friction between the block and the surface is 0,40 and the coefficient of dynamic is 0,20.
d) what is the minimum force required to keep the block in motion once it has been started?
To determine the minimum force required to keep the block in motion once it has been started, we need to consider the force of static friction.
The formula for the force of static friction is given by:
fs ≤ μs * N
where fs is the force of static friction, μs is the coefficient of static friction, and N is the normal force.
In this case, the coefficient of static friction is 0.40 and the normal force is 20N. Plugging these values into the formula, we have:
fs ≤ 0.40 * 20
fs ≤ 8N
Therefore, the minimum force required to keep the block in motion once it has been started is 8N.