1. Which example represents a class 2 lever? •tweezers plucking hairs

•a car door being opened and shut

•salad tongs picking up salad
•a screwdriver opening a paint can

2. Which statement best describes energy?

Energy is the force that causes movement in an object.

Energy is a push or pull on an object that will change the motion of the object.

Energy is the power derived from the utilization of simple machines.

Energy is the ability to do work.

3. Which statement best describes work?Work is the force that causes movement in an object.

Work is a push or pull on an object that will change the motion of the object.

Work is the power applied to simple machines.

Work is the ability to exert energy.

4. A shovel performs several different functions. One of these is that it gives mechanical advantage as a lever. When does it act like a lever? 

when the soil is lifted with the dirt at the end of the shovel and a lifting force at the handle

when the shovel is in the dirt and you push down against the end of the shovel, making it pivot

when you step up onto the shovel with both feet to use your body weight

when you push the shovel downward into the dirt and a small force allows you to push down into the dirt easily

5. A person uses a screwdriver as a lever to open a can of paint. Where is the fulcrum in this situation?

the point where the person holds onto the can to keep it in place

the point where the end of the screwdriver lifts up the lid of the can

the point where the person pushes down on the screwdriver

the point where the screwdriver touches the rim of the can

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