Which machine changes the direction of force needed to do a task without changing the size of the force needed?

Abearing is designed to a reduce friction b. support a load c.guide moving parts such as wheels, shafts and pivots d. all of the above

If the ama of the inclined plane below is 2, calculate the ima and efficiency. ima = efficiency =

Both speed and velocity measure how fast something is moving. however, since speed is not a it does not require a(n question 6 options: a) quantity , unit b) magnitude, unit c) scalar, direction d) vector, direction