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Work
Power
Efficiency
Simple Machines
Simple Machines
100
What is work?
The product of force and distance.
100
What is power?
The rate of doing work.
100
What is the term for the number of times that a machine increase an input force?
Mechanical Advantage
100
What makes work easier?
machines
100
Which type of simple machine is an inclined plane wrapped around a cylinder?
Screw
200
What is the SI unit for work?
Joule
200
What is the SI unit for power?
Watts
200
Actual Mechanical Advantage (AMA) is the ratio of __________________ to ______________________.
Output force, input force
200
What are the six types of simple machines?
Lever, wheel and axle, pulley, screw, wedge, inclined plane
200
Which type of simple machine has a rope wrapped along a groove in a wheel?
Pulley
300
If the force and motion are in different directions, is work being done?
No, force and motion need to be in the same direction for motion.
300
How can you increase power?
More work in the same amount of time. Same work in less time.
300
Why is a machine's efficiency never 100%?
Some of the input force is always needed to overcome friction.
300
Which type of simple machine is a rigid bar that moves around a fixed point?
Lever
300
A steering wheel is an example of which type of simple machine?
Wheel and axle
400
If a weight lifter exerts a force 1600 N to lift a weight 2.0 m, how much work was done?
3200 J = 1600 N x 2.0 m
400
What is the unit that was created by James Watt and is equal to 746 W?
Horsepower
400
What is the term for the percentage of work input that becomes work output?
Efficiency
400
What distinguishes a first class, second class, and third class lever?
The location of the fulcrum, input force, and output force.
400
A nut and bolt is an example of which type of simple machine?
Screw
500
If work is 525 J and the distance traveled is 15 m, what is the force exerted on the object?
35 N
500
If work force is 72 N, Time is 2.0 s, and Distance is 1.0 m, what is the power?
36 W
500
What is the IMA for a ramp if the input distance is 1.8 m and the output distance is 0.3 m?
6
500
Explain why a hockey stick is a third class lever?
The fulcrum is at one end, the output is at other end, and the input force is in the middle.
500
The tip of a nail is which type of simple machine?
Wedge