Unit 2 Work Energy Machines

Identify the simple machine in the picture.

• Wheel and axle

• Inclined plane

• Lever

• Wedge

Identify the simple machine in the picture.

• Inclined plane

• Wedge

• Pulley

• Screw

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Identify the simple machine in the picture.

• Screw

• Wheel and axle

• Wedge

• Pulley

Identify the simple machine in the picture.

• Inclined plane

• Wedge

• Lever

• Screw

A door knob would be an example of which type of simple machine?

• Pulley

• Wheel and axle

• Screw

• Inclined plane

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A simple machine makes work easier by doing which of the following?

• Increasing the distance through which force is applied.

• Changing the direction of applied force.

• Multiplying the force of the energy applied.

• All of the above.

Compound machines consist of two or more simple machines combined together to make work easier and increase the mechanical advantage. What two simple machines are used in a wheelbarrow?

• Wheel/ axle and a lever

• Lever and a wedge

• Wheel/ axle and a screw

• Inclined plane and a lever

Answer explanation

Compound machines consist of two or more simple machines combined together to make work easier and increase the mechanical advantage. What two simple machines are used in a pair of scissors?

• Lever and a wheel/ axle

• Screw and a wedge

• Wedge and a lever

• Pulley and a lever

Answer explanation

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Compound machines consist of two or more simple machines combined together to make work easier and increase the mechanical advantage. What three simple machines are used in a bicycle?

• Wheel/ axle, pulley, and a lever.

• Inclined plane, pulley, and wheel/ axle.

• Wedge, lever, and screw.

• Screw, lever, and Inclined plane.

Answer explanation

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The ability to do work comes from:

• Work

• Force

• Energy

• Gravity

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