Work And Machines Question Preview (ID: 33682)


Work And Machines.[print questions]

Turning the wheel on a wheel and axle results in a mechanical advantage because:
a) magic wheel gnomes.
b) the wheel needs more force.
c) the wheel radius is smaller than the axle radius.
d) the wheel radius is larger than the axle radius.

A simple machine with two circular objects of different sizes.
a) pulley
b) wheel and axle
c) lever
d) screw

Block and tackle pulleys are very efficient because of the:
a) extra force that is required.
b) fewer wheels and rope segments.
c) extra wheels and rope segments.
d) magic pulley gnomes

A teeter-totter would be an example of a _______ class lever.
a) first
b) second
c) third
d) fourth

Your forearm would be an example of a _______ class lever.
a) first
b) second
c) third
d) fourth

A simple machine that has a grooved wheel that holds a rope or cable.
a) lever
b) wedge
c) screw
d) pulley

Scissors would be an example of a _______ class lever.
a) first
b) second
c) third
d) fourth

A wheelbarrow is an example of a______class lever.
a) first
b) second
c) third
d) fourth

A simple machine with a bar that pivots at a fixed point, called a fulcrum.
a) lever
b) pulley
c) screw
d) inclined plane

The number of times the machine multiplies force.
a) force input
b) power advantage
c) simple machine
d) mechanical advantage

The work a machine puts out.
a) friction
b) work output
c) work input
d) power

The work you put into a machine.
a) forces
b) machining
c) work output
d) work input

Power is measured in:
a) joules
b) forces
c) motion
d) watts

A device that makes work easier by changing the size or direction of the force.
a) power
b) machine
c) force
d) work

The rate that energy is transferred.
a) work
b) power
c) joules
d) machines

Work depends on:
a) mass and distance.
b) force and roughness.
c) speed and direction.
d) force and distance.

The joule measures:
a) power.
b) watts.
c) work.
d) forces.

When you exert a force on an object that causes the object to move.
a) work
b) watt
c) power
d) machine

For work to happen, when a force is applied:
a) the object must go the opposite direction as the force.
b) the object must go the same direction as the force.
c) the object should not move.
d) the forces should be balanced.

The greater the length is in relation to the height of an inclined plane, the___________the mechanical advantage is.
a) more equal
b) smaller
c) greater
d) less force

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