ID the Simple Machine
Formulas
True or False
Levers
Wild Card
100
Flagpole A. lever B. wheel and axle C. inclined plane D. wedge E. screw F. pulley
What is F. pulley
100
What is the mechanical advantage of a wheel that has a radius of 0.35 m, if the axle has a radius of 0.05 m?
What is 7. Formula MA=radius of wheel/ radius of axle
100
A lever consists of a bar that pivots about a fixed point called the focus.
What is False, it pivots around the fulcrum
100
An oar is an example of a _______ class lever. A. first B. second C. third
What is A. first
100
This simple machine is good for vertical lifting? A. lever B. wheel and axle C. inclined plane D. wedge E. screw F. pulley
What is F. pulley
200
drill bit A. lever B. wheel and axle C. inclined plane D. wedge E. screw F. pulley
What is E. screw
200
A magnet applies a 7000 N force to raise a car 5 stories high. If each story is 5 meters tall, how much work does the magnet do?
What is 5 stories x 5 meters=25 m distance Formula for work: w= f x d 7000 N x 25 m = 175,000 Joules (work is measured in joules)
200
A wedge is a sloped surface that forces materials apart.
What is True
200
A hockey stick is an example of a _______ class lever. A. first B. second C. third
What is C. third
200
The input and output on a first class lever are in ___________ directions.
What is opposite
300
narrow bow of a ship A. lever B. wheel and axle C. inclined plane D. wedge E. screw F. pulley
What is D. wedge
300
A tow truck exerts a force of 400 N to tow a car 200 meters in 40 seconds. How much power does the truck have?
What is first, find the work: 400 x 200= 80,000 joules Then, use the power formula: p= work / time 80,000 / 40 sec. = 2,000 watts Power is written in watts.
300
When two simple machines work together it is called a composite machine.
What is False-compound
300
A wheelbarrow is an example of a ________ class lever. A. first B. second C. third
What is B. second
300
How do you increase the ideal mechanical advantage of an inclined plane? A. increase the length and increase the height. B. decrease the length and increase the height. C. Increase the length and decrease the height.
What is C. Increase the length and decrease the height.
400
jar lid A. lever B. wheel and axle C. inclined plane D. wedge E. screw F. pulley
What is E. screw
400
If a machine uses 200 Joules of work to accomplish 100 Joules of work, what is the efficiency of the machine?
What is Formula: E= work out/ work in x 100 100 / 200 =0.5 x 100= 50% efficiency is written as a percent
400
The efficiency of a compound machine is determined by multiplying the efficiency of each simple machine.
What is true
400
The part of a lever that applies force is the ________ _____. A. output arm B. input arm C. fulcrum
What is input arm
400
The ideal mechanical advantage of a pulley system is ______ _____ the number of sections of rope that pull upward on the object. A. less than B. more than C. equal to
What is C. equal to
500
roller skates A. lever B. wheel and axle C. inclined plane D. wedge E. screw F. pulley
What is B. wheel and axle
500
A 10 meter long ramp is used to launch a bike, and is 5 meters off the ground. What is the ideal mechanical advantage of the ramp?
What is Formula: IMA= distance in/ distance out 10 / 5 = 2
500
The mechanical advantage of a second class lever is always less than 1.
What is False-its always greater than 1
500
Draw and label using input and output arrows, a first, second, and third class lever. Use text book and notes-
What is look answer up in book to points
500
Simple machines can change the _______, ________, and __________ of a force.
What is direction, size, distance.
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