Vocabulary
Energy
Work
Power
Calculations
100
A push or a pull
What is force
100
A diver on top of a diving board is an example of ______________________ energy.
What is potential energy
100
Two students who are similar in size walk up the same set of stairs. They are doing _________________ amount of work.
What is the same!
100
The two factors of power are work and ________________.
What is time.
100
The power required to do 100 J of work in 5 seconds
What is 20 W
200
Stored energy
What is potential energy
200
A car rolling down a hill is an example of _____________________ energy.
What is kinetic energy
200
Work = ____________________ x ___________________
What is FORCE x DISTANCE
200
Power is measured in _____________________.
What is watts.
200
The work done when you lift a 50-N rock 15 meters
What is 750 J
300
The units of force
What is newtons
300
A person skiing down a slope is ______________________ potential energy, and ____________________ kinetic energy.
What is losing potential energy and gaining kinetic energy
300
If Jack pushes an object with twice the force for twice the distance, he does ______________ as much work
What is four times
300
The _________________ amount of time it takes to do work, the more power is produced.
What is shorter
300
What is the amount of work done lifting a 50-kg weight 5 m vertically? (Remember to check units)
What is 2500 J F=ma W = f x d F = 50kg x 10 m/s2 W = 500 N x 5 m F = 500 N W = 2500 J
400
the combination of 2 or more simple machines working together
What is compound machine
400
The unit of energy
What is joules
400
Pushing against a wall is an example of doing work. True/False
What is false - not moving over a distance!
400
Two cars that weigh the same race up the hill. Car 1 gets there twice as fast as Car 2. Which car had more power?
What is car 1
400
How much power is expended when a 15-N barbell is raised 4.0 m in 3 s.
What is 20 W W = F x d P = W/t W = 15N x 4 P = 60/3 W = 60 J P = 20 W
500
How much work is performed in a certain amount of time
What is power
500
Suppose a car is moving with 1000 J of kinetic energy. If the car's speed doubles, how much kinetic energy would it then have? KE = (1/2) m x v2
What is 4000J
500
Lifting three loads up one story, how much work do you do compared to lifting one load up one story.
What is three times as much.
500
The amount of power is expended if you lift a 400N rock 10 meters in 2 seconds
What is 2000 W
500
The work done lifting a 25 kg log to a height of 60 cm. (check units!)
What is 150 J F=m x a W=F x d F=25kg x 10 m/s2 W=250N x .6m (60cm = .6m) F=250 N W=150 J
M
e
n
u