Potential Energy and Kinetic Energy Prelesson

Potential energy is energy:
1. That is stored
2. That is active
3. That is non-existent
4. That is most powerful
So if potential energy is stored energy, where is it stored?
1. In its position (how high it is)
2. How fast it is going
3. How big it is
4. How long it is
Potential energy (Ep) is energy of position. Which of these has the most Ep:
1. A ball 4 m up a ramp
2. A ball on the ground
3. A very heavy ball on the ground
4. A ball on a table 1 m high
Ep (Potential energy) increases as height increases. So which of the following has more Ep?
1. A heavy box 10 m up a ramp
2. A light box 10 m up a ramp
Ep increases as mass increases and as height increases. Which of the following will also increase Ep:
1. more gravity
2. more light
3. more density
4. more friction
To find potential energy (Ep) you need these three quantities: mass, height, and the acceleration of gravity.
What is the equation, then for Ep?
1. Ep = mgh
2. Ep = mg/h
3. Ep = mh/ g
4. Ep = mg + g
Ep = mgh.

Which of the following has more Kinetic Energy (Ek)
1. A fast bus
2. A slow bus
3. A stationary bus
So more velocity (speed) makes for more Ek (kinetic energy).

Which of the following has more kinetic energy:
1. A fast bus
2. A fast car
3. A fast penny
So, Ek increases with mass and increases with velocity.

What is the equation for Ek?
1. Ek = 1/2 mv²
2. Ek = mv²
3. Ek = mgh
4. Ek = 2m/v²
If a rock is sitting on a ledge, what kind of energy does it have?
1. Ep
2. Ek
If the rock is pushed off the ledge it will begin moving. What kind of energy is it gaining as it falls?
1. Ep
2. Ek
As the rock falls it will lose:
1. height
2. mass
3. velocity
If it is losing height while fallling, what kind of energy is it losing?
1. Ep
2. Ek
As it is falling, the rock will be:
1. slowing down
2. speeding up
3. falling at a constant speed
Because it is speeding up (gaining velocity), it will be gaining:
1. Ep
2. Ek
So, when an object falls, it is:
1. Gaining Ep and losing Ek
2. Losing Ep and gaining Ek
3. Losing both Ep and Ek
4. Gaining both Ep and Ek
When an object is thrown up into the air:
1. It gains Ep, but loses Ek
2. It gains Ek, but loses Ep
3. It gains both Ep and Ek
4. It loses both Ep and Ek
The Law of Conservation of Energy states: "Energy can never be created nor destroyed, only transformed into other forms."

If an object falling from a ledge loses Ep and gains Ek, which of the following is true:
1. The Ep turns into Ek.
2. The Ep is lost and the Ek comes from gravity.
3. The Ep isn't really lost, it is just stored again inside the object.
4. Ek becomes so big that the Ep becomes to small to notice.
Using the Law of Conservation of Energy, what happens to the energy of a ball thrown from the ground into the air?
1. The ball starts with Ep and gains Ek as it goes up.
2. The ball has all Ek when it is thrown, but gains Ep as it goes up.
3. The amount of Ep and Ek stays constant because of conservation of energy.
4. Ep changes, but Ek does not.