PE
KE
Units
Philosophy
Extra Stuff
100
Define Potential Energy
What is stored energy?
What is energy of Position?
100
Define Kinetic Energy
What is energy of motion?
100
Mass and Height Units
What is Kilograms, kg
What is meters, m
100
Define Energy
What is the ability to do work?
100
find velocity
What is distance / time?
200
Formula
What is PE= m x g x h?
200
Find highest and lowest points of Kinetic energy
What is 3 is the highest and 5 is the lowest?
200
Constant force
What is gravity?
200
Think about PE formula from the tennis ball activity
_________ and _________ have a direct relationship.
What is height and Potential Energy?
200
A 30 kg child climbs 15 meters up a tree. Find the child’s potential energy.
What is PE = m x g x h
PE = (30kg) x (9.8m/s2) x (15m)
PE = 4410J
300
Highest and lowest Gravitational Potential Energy
What is 5 is the highest?
What is 3 is the lowest?
300
Formula for Kinetic Energy
What is KE = 1/2m x v2?
300
Velocity units
What is m/s?
300
Think about the KE formula
____________ affects KE more
(MASS or VELOCITY)
What is VELOCITY?
300
Kinetic Energy of a 1200 kg object that is moving with a speed of 24 m/s
KE = ½ m x v2
KE = ½ (1200kg) x (24 m/s)2
KE = (600kg) x (576 m2/s2)
KE = 345,600J
400
Find the potential energy of a 4 kg ball on a 20 meter hill.
What is m x g x h
4kg x 9.8 m/s2 x 20m
= 784J
400
Find the KE of a 75kg car traveling down the road at 20m/s.
KE = 1/2m x v2
KE = 1/2 (75kg) x (20 m/s)2
KE = 37.5 kg x 400m2/s2
KE = 15,000J
400
Gravity units and number
What is 9.8m/s2?
400
It takes a skateboarder 2 seconds to get from the top of the ramp to the bottom. The ramp is 12 meters. Find velocity of the Skateboarder.
What is velocity = distance / time
v = 12m/ 2s
v = 6 m/s
400
3 types of Potential Energy?
What is
Gravitational
Chemical
Nuclear
500
A man climbs on to a wall that is 3.6m high and gains 2268J of potential energy. Find the MASS of the man?
What is solve for m in PE = m x g x h formula
m= (PE)/(g x h)
m = (2268J) / ( 9.8m/s2 x 3.6m)
m= 64.3 kg
500
FIND the MASS of an object moving with a speed of 35 m/s and has a kinetic energy of 1500 J.
KE = ½ mv2 KE = 1500J m = ? v = 35m/s
m = 2KE/v2 (rearrange equation)
m = 2(1500J)/(35)2
m = 3,000/1225
m = 2.45kg
500
Kgm2 / s2
What is joules?
500
Law of conservation of energy?
What is energy cannot be created or destroyed, only converted from one form to another or transferred between systems?
500
5 types of Kinetic Energy
What is
Electrical
Radiant
Thermal
Sound
Mechanical