which example represents a class 2 lever? a screwdriver opening a paint can, a car door being opened and shut, tweezers plucking hairs, salad tongs picking up salad.

Answer 1

The example that represents a class 2 lever is the tweezers plucking hairs. Tweezers are a class 2 lever because the load (hair) is between the fulcrum (pivot point of tweezers) and the effort (force applied to close the tweezers).

Answer 2

which statement best describes energy? energy is a push or pull on an object that will change the motion of the object. energy is the ability to do work. energy is the power derived from the utilization of simple machines. energy is the force that causes movement in an object.

Answer 3

The statement "energy is the ability to do work" best describes energy. Energy is defined as the capacity or ability to do work. Work involves the application of a force over a distance to move an object, and energy is what allows that work to be done.