Work And Machines Question Preview (ID: 33682)
Work And Machines.
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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 joule measures:
a) power.
b) watts.
c) work.
d) forces.
Work depends on:
a) mass and distance.
b) force and roughness.
c) speed and direction.
d) force and distance.
The rate that energy is transferred.
a) work
b) power
c) joules
d) machines
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 work you put into a machine.
a) forces
b) machining
c) work output
d) work input
The work a machine puts out.
a) friction
b) work output
c) work input
d) power
The number of times the machine multiplies force.
a) force input
b) power advantage
c) simple machine
d) mechanical advantage
A simple machine with a bar that pivots at a fixed point, called a fulcrum.
a) lever
b) pulley
c) screw
d) inclined plane
A wheelbarrow is an example of a______class lever.
a) first
b) second
c) third
d) fourth
Scissors would be an example of a _______ class lever.
a) first
b) second
c) third
d) fourth
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
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 simple machine with two circular objects of different sizes.
a) pulley
b) wheel and axle
c) lever
d) screw
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.
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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