Athird class lever has a mechanical advantage of < 1. what is an example of a third class lever and why use it?
a) pulley; changes direction
b) baseball bat; increases velocity
c) car jack; increases the weight it can lift
d) wheel barrow; makes it easier to move a load

An object resting on a table weighs 100 n. with what force is the object pushing on the table? with what force is the table pushing on the object? explain how you got your answer.

In a system with only a single force acting upon a body, what is the relationship between the change in kinetic energy and the work done by the force? answers: work is equal to the change in kinetic energy. work depends on the square of the change in potential energy. work is equal to the negative of the change in kinetic energy. work is equal to the square of the change in kinetic energy

Aball of mass 0.3kg is released from rest at a height of 8m. how fast is it going when it hits the ground? accleration due to gravity is g=9.8m/s