Work
Power
Levers
Wheels, gears and pulleys
Inclined plane, wedges and screws
100
Si unit for work?
watt
100
What is the unit for power?
watts
100
Levers, wheels and inclined planes
Simple machines
100
A wheel is a modified
Lever
200
The energy transferred to a system by an external force when it acts on the system to move it
work
200
What are the two factors determining power
amount of work over time
200
Which is not a lever: baseball, crowbar, rake, tweezers
A baseball
200
A modified wheel and axle with notches is a
gear
200
A spiral staircase in a lighthouse is most similar to a
Screw
300
The energy transferred to a system by an external force when it acts on a system to move it
work
300
What is the rate of doing work
power
300
A wheel and axle is a modified
Lever
400
What is the measure of the reduction in effort to do a certain amount of work when using a simple machine
mechanical advantage
400
True or false a machine can do more work in less time if it has more power
true
400
True or false multiple pulleys are more effective than single pulleys
true
400
What is a solid triangular object that can be driven between two objects either to separate them or bring them together
A wedge
500
While mowing the lawn you push a lawn mower 120 meters with a constant force of 300 newtons . How much work have you done?
(300)(120)= 36000 j
500
An elevator lifts a person with 7320 J of work in 15s. How much power does the elevator produce?
7320/15 = 488 watts
500
The point at which a lever pivots or rotates is
a fulcrum
500
The helpfulness or usefulness of a machine is known as
Mechanical advantage
500
What is a fastener that is a long thin wedge wrapped around a helix
A screw
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