Work & Power: The Physics Way
Mechanical Advantage
Simple Machines Made Simple
Levers & Pulleys with some Wheel and Axle
The Randomness of Science
100
Calculate: You go rock climbing with a pack that weighs 70N and you reach a height of 30m. How much work did you do to lift your pack? If you finished the climb in 10minutes (600s) what was your power?
What is Work = 70N x 30m = 2100 J and Power = 2100J/600s =3.5 W?
100
Ideal mechanical advantage is calculated without _________ included.
What is friction?
100
To which class of lever does a bottle opener belong?
What is second class?
100
Name the three types of pulleys.
What is fixed, movable and block and tackle?
100
This force causes machines to loose efficiency.
What is friction?
200
Force x distance is the formula for ______.
What is work?
200
The ideal mechanical advantage of a wheel and axle is the radius of the wheel _________ the radius of the axle.
What is divided?
200
The screw, wedge and lever are all ____________.
What is simple machines?
200
A wheelbarrow is in which class of levers?
What is second class?
200
The formula for power is ______________.
What is work/time?
300
What do car makers mean when they say their cars are more powerful than their competitors' cars?
What is their cars do more work in the same amount of time?
300
The ideal mechanical advantage for an inclined plane is equal to the length of the inclined plane divided by the ________?
What is height of the inclined plane?
300
Two or more simple machines make a ____________.
What is a compound machine?
300
When calculating a mechanical advantage given distances what is the formula?
What is MA = input/output?
300
The work exerted by YOU is called ___________.
What is input force?
400
Work is done on an object when the object moves in the same _________ in which the force is exerted.
What is direction?
400
Mechanical advantage of a machine is the number of times a machine increases ____________.
What is the force exerted on the machine?
400
A screwdriver is this type of a simple machine.
What is a wheel and axle?
400
The fixed point a lever rotates around is called the _____.
What is the fulcrum?
400
Is a bicycle a compound machine? Why?
What is yes because it is made up of more than one simple machine?
500
Machines make work easier by multiplying force or _______, or by changing direction.
What is distance?
500
If the mechanical advantage of a lever is 6 and this is used as the input force of a pulley system with a mechanical advantage of 3, what is the mechanical advantage of this compound machine?
What is 18?
500
Describe an inclined plane (ramp) that allow one to do work easier?
What is it would be long and not too high?
500
In a wheel and axle system the object with the _______ radius is the wheel.
What is larger?
500
The ideal MA of a wheel and axle is the radius of the wheel __________ the radius of the axle.
What is divided?
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