Mechanical Advantage and Simple Machines

Elevators lift loads by employing a motor and a complex system of pulleys. If the elevator converts all the energy used to work (no heat or friction is generated), how many Joules would be required to lift a 2,500 N load 15 m? This is about five floors in a typical building.

• 1637 J

• 3827 J

• 37500 J

• 167 J

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A seesaw is an example of a  

• wedge

• lever 

• inclined plane 

• pulley 

Stairs

• wedge

• pulley

• inclined plane

• wheel and axle

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This device

• wedge

• lever

• incline plane

• wheel and axle

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What is resistance (output) force?

• the force required by a machine in order to accomplish work (the force you put on the machine)

• the force which an effort force must overcome in order to do work on an object via a simple machine.

• the force the machine exerts on a object

• the output work times the input distance

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.

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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 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

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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 two simple machines are used in a corkscrew?

• Pulley and a wedge

• Wedge and a screw

• Lever and an inclined plane

• Screw and a lever

Answer explanation

Identify the simple machine in the picture.

• Lever

• Inclined plane

• Wheel and axle

• Screw

Identify the simple machine in the picture.

• Wheel and axle

• Inclined plane

• Lever

• Wedge