Conservation of Energy
(No Math)
(No Math)
What does the Law of Conservation of Energy state?
Energy can not be created or destroyed it is simply transformed from one form to another.
What is the equation for Kinetic Energy
1/2mv2
What is the Equation for Work?
W = F x d
What is the equation for Gravitational Potential Energy
GPE = mgh
TE = PE + KE
True or False: If you have 250J of GPE at the top of the hill you will only have 125J at the bottom of the hill because you are losing energy from height.
False.
What is the Kinetic Energy an 10 kg object has while traveling at 5 m/s?
125J
What is the equation for work using changing kinetic energy?
KEf - KEi = Work
The change in GPE is equal to the .....
Work done on the object.
A roller coaster is moving with 250 J of Kinetic Energy and the system has 780J of total energy. How much GPE does the roller coaster have?
530J
The Total Energy in an object has is equal to what?
KE + PE
Kinetic Energy + Potential Energy
A 12kg dog jumps off the ground with a speed of 7 m/s. How much Kinetic Energy does the dog have at the start?
294J
Define work as it relates to physics?
energy transferred to or from an object through the application of force along a displacement
what is the accelerationg due to gravity (g) equal to?
9.8 m/s2
True or False. The total energy in a system is constantly changing in a system as the energy goes from KE to PE.
False
Which of these answers below is not measured in Joules.
Work, Gravitational Potential Energy, Kinetic Energy, or Thermal Energy
Trick Question they are all measured in Joules!
They are all forms of Energy
A roller coaster has a mass of 2,000kg and can move up to 35.8 m/s. How much Kinetic Energy will the roller coaster have at its lowest point?
1,281,640 Joules
A tracker pulls a cart with a force of 10,000N over a displacement of 30m. What was the work done by the tracker?
300,000J
What is the GPE of a 25 kg object being held 4.5 meters off the ground?
1125J
A box is falling off a shelf. What is happening to the Energy as the box falls.
The GPE is turning into KE
If the Total Energy on top of a roller coasters hill is 420,000J and it is 30 meters off the ground and traveling at 10 m/s....how much Work is done on the coaster to get it up there?
420,000J of Work.
An ant has a mass of .00006 kg and can move at speeds up to 0.85 m/s. At its fastest how much kinetic energy would an ant have?
.000022 Joules
A person lifts a piano up on a rope to deliver it to someone's apartment. The GPE the piano has near the ground is 2500J and at the apartment it has 12000J of GPE. How much work was done on the piano?
9500J
A 15kg dog jumps from the ground with KE of 1250J. What GPE will the dog have at its highest point?
1250J
At a height of 30m and 10kg ball is falling through the sky at 5 m/s. What is the Total Energy the ball has?
TE = PE + KE
3125J = TE