An axle to the center of a wheel and both rotate together
Wheel and axle
100
Point around which a lever pivots
Fulcrum
100
efficiency is a measure of this
work, percent work
100
The equation to calculate WORK
W = F x d
or
W = Fd
200
Transfer of energy from one object to another by force
Work
200
A flat, sloped surface
Inclined plane
200
The fulcrum is between the output and input forces
1st Class Lever
200
mechanical advantage is a measure of this
force
200
The equation to calculate power
P = W/t
300
The rate at which work is done
Power
300
A sloped surface that moves
Wedge
300
The input force is between the output force and the fulcrum
3rd Class Lever
300
1) There is no unit of measurement for this calculation
2) This calculation also does not have units, but is calculated in a % ratio
1) Mechanical advantage
2) Efficiency
300
The equation to calculate efficiency
efficiency = output work/input work x 100%
or
efficiency = W(out) / W(in) x 100%
400
Unit by which work is measured
Unit by which power is measured
joules, J
Watts
400
An inclined plane wrapped around a cylinder
Screw
400
The ouput force is between the input force and the fulcrum
2nd Class Lever
400
How would you calculate efficiency of a compound machine?
Multiply the efficiencies of all the simple machines
400
The equation to calculate mechanical advantage
MA = output force/input force
MA = F(out) / F(in)
500
List the 3 things that machines change about a force in order to make work easier
Size of, direction of, and distance at which a force acts
500
Grooved wheel with a rope wrapped around it
Pulley
500
CHALLENGE -- DOUBLE POINTS -- The equation for the ideal mechanical advantage of a lever
ideal mechanical advantage = length of input arm / length of output arm
or
IMA = L(in)/L(out)
500
Is it possible for machines to operate at the ideal mechanical advantage? Why or why not?
No. Friction always exists. [Ideal mechanical advantage is calculated without friction].
500
A Watt is like a Newton in that it is a unit of measurement that is comprised of other units of measurement. What are the units of measurement that a Watt is made of?