8th Physical Science GMAS Review - Simple Machines

Which simple machine changes the direction of the input force without increasing the output force?

• can opener
• fixed pulley
• wheelbarrow
• sledgehammer

When doing work using simple machines, what happens when the effort distance is increased?

• The effort force is decreased.
• The effort force is increased.
• The resistance force is increased.
• The direction of the effort force is changed.

Which of the following is often used as a lever?

• file
• nail
• saw
• crowbar

Marley uses a shovel to dig a hole to plant a tree.  A shovel is an example of a compound machine because it is made up of what two simple machines?

• wheel and axle and lever
• lever and wedge
• screw and wedge
• inclined plane and wedge

What type of simple machine is used to pull a flag up to the top of a flagpole?

• screw
• wheel and axle
• inclined plane
• pulley

An example of using a lever is

• using a big spoon to stir a pot of soup.
• using a fork to scramble an egg.
• using a ramp to roll a barrel into a pickup truck.
• using a screwdriver to pry the lid off of a can of paint.

Think of the threading of a screw being unwrapped.  Which statement correctly describes the simple machine represented in the screw.

• The thread of a screw is a wedge wrapped around a shaft.
• The thread of a screw is an inclined plane wrapped around a shaft.
• The thread of a screw is a lever wrapped around a shaft.
• The thread of a screw is a pulley wrapped around a shaft.

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Which of these machines will make work easier by helping to lift a load and move it in a horizontal distance.

• wedge
• pulley
• wheelbarrow
• the claw end of a hammer

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A staircase is most like what type of simple machine?

• lever
• wedge
• inclined plane
• wheel and axle

What would you do to reduce the amount of effort needed to lift something using a first class lever?

• Move the fulcrum to the middle of the lever.
• Move the fulcrum closer to the load.
• Move the fulcrum closer to the effort.

Tags

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