Work
This is the formula for work.
What is W = F x d
What is an example when an object has gravitational potential energy
Answers Varies
What are the SI units for power?
Watts
What is gravitational potential energy?
Stored energy due to the position.
What is the work done if a woman pushes a table with a force of 75N and the table moves 2 meters?
Work=75x2; W=150J
What type of energy (or energies) does ball falling through the air have?
gravitational potential energy and kinetic energy
What is the difference between work and power?
work doesn't involve time, but power does
How will the GPE of a baseball 1 meter high change when placed on the moon at the same height?
Gravity on the moon is less than on Earth so the GPE will be less.
When doing a squat during a workout, what part of the body does the work?
Legs
The type of energy a bowling ball rolling down the alley has.
kinetic energy
What is the formula for power
P=W/T
A rollercoaster has 100,000J PE at the top of the ramp. When it reaches the bottom of the ramp, how much KE does it have? (Assume all energy conserved)
100,000J
What is the formula for gravitational potential energy?
PE=mgH
If a person has a mass of 110kg, what force is exerted on the ground? If that person jumps 1 meter high, how much work is done? (Must use correct units)
110x10=1,100N
1,100Nx1m=1,100J
What is the equation for Total Energy?
TE = KE + PE
Who uses more power? Spencer walking up the 20 m high staircase in 10 seconds, or John going up a 10 m staircase in 5 seconds? (assume similar weights)
They use the same power.
Find the kinetic energy of a rollercoaster if the mass is 200kg and the velocity is 5m/s?
2,500J
An object has a mass of 250 kg. It is 20 m above the ground. What is the PE?
50,000J
What is an example of when force is applied but no work is done?
push on wall or other
The law states, "Energy is never created, lost, or destroyed. Only transformed." Name the law.
The law of conservation of energy.
A person has a mass of 70kg. He runs up a hill 8 meters high in 10 sec. Find the power he exerts.
Power: P=W/T; Work: W=FxD; W=(70x10)x8
P=5600/10; P=560W
What happens to the KE if you double velocity?
A 50 kg skier starts off from rest at the top of the hill 80 m high. How much GPE does the skier have halfway down?
PE=mgh =50kg(10m/s^2)(40)
=20,000J