Kinetic and Potential Ex.
This type of energy is known as the energy associated with motion
kinetic energy
An object sits at the top of a hill at rest, what is the object’s kinetic energy?
0J
What is an example of potential energy
A. Sitting on a chair
B. Running away
C. Falling into a cliff
A
This is the unit of energy
Joule
The variables that can impact gravitational potential (hint: PE = mgh)
Height (h) and Mass (m)
What does the v in the equation for calculating KE stand for?
Velocity
True Or False, an object that is moving down a hill but hasn’t reached the bottom yet still has potential energy?
True
In our PE equation, g is used to represent:
gravity
KE + PE = ____________
Total Energy (TE)
If the mass of an object doubles, what happens to the kinetic energy?
doubles or increases
A rollercoaster sits at the bottom of the track with a total mechanical energy of 2kJ. How much of this energy is potential?
none or 0?
An object taking its potential energy and using it to move is considered an energy _____________
transformation
An apple falling to the ground.
Kinetic energy
An object possesses 56 Joules of energy at the top of hill when the object is at rest. What is the objects kinetic energy at the bottom of the hill?
56 Joules
I have a wrecking ball about to destroy a building. At which point is its potential energy the highest?
At the highest point of the swing
Calculate the potential energy for a 15kg cart rolling down a 5m hill, assuming gravity = 9.8
(HINT: PE = mgh)
15*5*9.8 = 735J
What is formula in calculating potential energy?
PE=mass x gravity x height
What is the equation for calculating Kinetic Energy?
KE = 1/2mV2
What does the g in PE = mgh stand for, and what is its numeric value?
gravity, it equals 9.8m/s/s
Daily double: This type of energy is a part of mechanical energy and is gained through friction
heat/thermal energy