Chapter 5 Work and Simple Machines

What must occur if work is being done on an object?

• a force is applied but nothing moves

• An object moves in the direction of the force.

• An object has the ability to move.

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NGSS.MS-PS3-5

How can simple machines make work easier?

• by increasing the load

• by increasing the distance that an effort force is applied

• by decreasing the distance that an effort force is applied

How can you reduce the force needed to move a load when using an inclined plane?

• increasing the distance the load has to travel

• decreasing the distance the load has to travel

• increasing the height of the ramp

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NGSS.MS-ETS1-2

A fixed pulley makes lifting an object easier by

• decreasing the amount of force needed

• changing the direction the force is applied

• increasing the amount of force needed

A movable pulley makes lifting an object easier by

• increasing the amount of force needed

• decreasing the amount of force needed

• changing the direction the force is applied

A flagpole would be an example of what kind of simple machine?

• fixed pulley

• inclined plane

• movable pulley

How can the force needed to move a load be reduced when using a lever?

• decrease the distance the load is from the fulcrum

• increase the distance the load is from the fulcrum

• decrease the distance the effort force is from the fulcrum

Mr. Hallman is using a screw to hang a picture in his movie room. Which of these is the best description of a screw?

• A screw allows you to use less force because a screw is a type of pulley.

• A screw allows you to use less force because a screw is a type of inclined plane.

• A screw allows you to use less force because a screw is a type of lever.

Which of these is an example of a lever?

• flagpole

• see saw

• stairs

Where on a bike would you find a pulley?

• handlebar

• seat

• gear and chains