Kinetic Energy
What is the relationship between speed and kinetic energy
Proportional: The faster an object travels the more kinetic energy
What is the relationship between position and potential energy?
Proportional, as the position increases so does the PE
What type of energy is in food?
Chemical potential energy
If you had to place the energy conversions in chronological order what would it be for a flash light?
Start with the batteries
Chemical potential energy, electric energy, radiant energy, thermal energy
Which object has the LEAST potential energy?
1. a 6 kg rock on a 2 m hill
2. a .05 kg book on a 2m shelf
3. a 2 kg man on a 2 m stool
As an object's mass increases what happens to the kinetic energy?
The kinetic energy increases
List two ways to increase an object's potential energy
1. Increase the position
2. Increase the mass
What type of energy does a jack hammer transfer to the ground?
Mechanical Energy
What happens to the kinetic energy in a bowling ball after it hits the pins?
The kinetic energy is TRANSFERRED
Which object has the most kinetic energy?
1. a 5kg ball rolling 2 m/s
2. a 5 kg ball rolling 10 m/s
3. a 5 kg ball rolling 5 m/s
A 2kg ball rolling at a speed of 6 m/s
KE = 1/2mv2
36 J
A 2 kg book on a 12 m shelf
Calculate PE
PE=mgh
gravity 9.8
235.2 J
What type of energy does a walkie talkie use?
Radiant Energy
bc it uses radio waves
In a system, does the total amount of energy every change? Why or why not?
No, because of the law of conservation of energy
If you double the mass, the potential energy will be ______ as much
twice
A 15 kg girl running 5 m/s
KE = 1/2mv2
187.5 J
A 20 kg boulder on a 20m hill.
PE = mgh
gravity 9.8
3,920 J
What type of energy is Kinetic energy and potential energy combined?
Mechanical energy
What energies does the sun have? Try to list them in order. (There are three)
nuclear, radiant, thermal
If you double the speed of an object the kinetic energy will be _______ as much
4 times
A 220 kg car traveling at 60 m/s
KE= 1/2mv2
396,000 J
A 200 kg car on top of a 50 m parking deck
PE = mgh
gravity is 9.8
98,000 J
Energy cannot be created or destroyed. It can only be converted or transferred between objects.
What energies are used in a microwave. Try to list them in order (4 or5)
Electrical energy, radiant energy, thermal energy, mechanical energy, (possibly sound energy)
To increase the kinetic energy of a rollercoaster what could you do?
1. Increase the height
2. increase the mass
Basically increase potential energy