8th Grade Physical Science Pre-Test Review - Chapter 14.3

Mechanical Advantage

• The advantage of a machine if there was no friction.

• The ratio of output force to input force

• The percentage of work input that becomes the work output

• The number of times a machine increases force

Actual Mechanical Advantage

• The advantage of a machine if there was no friction.

• The ratio of output force to input force

• The percentage of work input that becomes the work output

• The number of times a machine increases force

Ideal Mechanical Advantage

• The advantage of a machine if there was no friction.

• The ratio of output force to input force

• The percentage of work input that becomes the work output

• The number of times a machine increases force

Efficiency

• The advantage of a machine if there was no friction.

• The ratio of output force to input force

• The percentage of work input that becomes the work output

• The number of times a machine increases force

For a given input force, what affects the output force that a nutcracker can exert on a nut?

• The size of the nutcracker

• The type of nut

• The position of the nut in the nutcracker

• How hard a person can swing the nutcracker and hit the nut after the nutcracker is not able to crack the nut

____________________ describes the relationship between input force and output force.

• Efficiency

• Mechanical Advantage

• Actual Mechanical Advantage

• Ideal Mechanical Advantage

How is the actual mechanical advantage of a machine determined?

• The ratio of the output force to the input force

• The product of the output force and the input force

• The ratio of the output force to the input force, taking friction into account

• None of the above

Why is greater input force required to move an object along a ramp with a rough surface, compared to a ramp with a smooth surface?

• Height of the ramp

• The weight of the object being moved

• Friction

• Determined as to whether you can use wheels to move the object

A loading ramp with a rough surface has a greater mechanical advantage than one with a smooth surface.

• True

• False

Because of friction, the actual mechanical advantage of a machine is never greater that its ideal mechanical advantage.

• True

• False