Chapter 8 Work and Machines Sheltered

Which formula gives you the measure of how much work has been done?

• work input= F_e x d_e

• Efficiency = work output / work input

• MA = effort arm / resistance arm

• work = force x distance

Which term is a unit of measure for power?

• joule

• newton

• watt

• resistance

If you move a table 50 meters in 50 seconds using 200 newtons of force,

how much power have you used?

• 200 watts

• 10,000 joules

• 500,000 joules

• 1,000 watts

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A boulder at the top of a mountain has what kind of energy?

• electrical

• potential

• kinetic

• nuclear

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What is meant by the law of conservation of energy?

• Energy used to do work may take one of six forms.

• As potential energy decreases, kinetic energy increases.

• Machines conserve energy by giving large work output for small work input.

• Energy may change form, but it cannot be created or destroyed.

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What kind of lever has a fulcrum, resistance arm, and effort arm?

• first-class lever

• second-class lever

• third-class lever

• all of the above

A machine multiplies your effort force by 3 times. What does the number 3 represent?

• mechanical advantage

• resistance force

• power

• work

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What kind of lever has the fulcrum between the effort and the resistance and changes the direction of a force?

• first-class lever

• second-class lever

• third-class lever

• any lever

Which formula expresses the work output, or the amount of work actually done by the machine?

• F_e x d_e

• F_r x d_r

• F_r / F_e

• F₁ x 1₁ = F₂ x 1₂

Rope, chain, or belt wrapped around a wheel that changes the

direction of an applied force. Movable or fixed types.

• Inclined Plane

• Pulley

• Wheel and Axle

• Wedge

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