Work and Simple Machines Multiple Choice Quiz

What is the definition of work in physics?

• The amount of force applied to an object

• The transfer of energy when a force is applied over a distance

• The speed at which an object moves

• The mass of an object multiplied by its acceleration

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In what unit is work measured?

• Newtons

• Meters

• Joules

• Watts

For work to be done, which two conditions must be met?

• An object must move and the force must be perpendicular to the motion

• An object must move and the motion must be in the same direction as the force

• An object must be stationary and a force must be applied

• An object must accelerate and the force must be constant

What is the formula for calculating work?

• W = F + d

• W = F × d

• W = F ÷ d

• W = F - d

Why are joules the unit for work?

• Because work is measured in meters

• Because work is measured in newtons

• Because work is the transfer of energy

• Because work is measured in seconds

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NGSS.MS-PS3-5

If you push a wheelbarrow with a force of 50 N for a distance of 10 m, how much work is done?

• 60 J

• 500 J

• 5 J

• 40 J

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NGSS.MS-PS3-5

When pushing a crate across a floor with friction, how do you calculate the net force for work?

• Add the pushing force and friction force

• Multiply the pushing force and friction force

• Subtract the friction force from the pushing force

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What does the Law of Conservation of Energy state about work and simple machines?

• Simple machines always reduce the amount of work needed

• Simple machines always increase the amount of work needed

• If there is no friction, the work input equals the work output

• Simple machines create energy

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How do simple machines make work easier?

• By changing the amount of work required

• By changing the force, distance, or direction of the work

• By eliminating the need for work altogether

• By increasing the energy input required

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Which of the following is NOT one of the six simple machines?

• Wheel & Axle

• Inclined Plane

• Pulley

• Spring