PS - Energy and Momentum

Termy Terms

KE = 1/2m*v^2

PE = m*g*h

Stuffy Stuff

100

The Law of __________ of Energy states that energy cannot be ____________ or ____________, only ________________.

The Law of CONSERVATION of Energy states that energy cannot be CREATED or DESTROYED, only CONVERTED OR TRANSFERED.

100

Kinetic Energy of any object depends on that objects _________ and ________.

Kinetic Energy of any object depends on that objects MASS and SPEED.

100

An objects Potential Energy depends on the object's ___________, _____________, AND ______________ due to Gravity

An objects Potential Energy depends on the object's MASS, POSITION (HEIGHT) and ACCELERATION due to Gravity.

100

This is the equation for Mechanical Energy.

KE + PE = ME

200

You will reuse words more than once.

When something is moving, it has ________1_______ energy.
When something has stored energy, usually from being up high, it has _______2________ energy.

When the object is halfway down a hill, half of the ________3_______ energy has been converted to _________4______ energy.

Both of these types of energy added together is called _________5______ energy.

When something is moving, it has ________1_______ energy.
When something has stored energy, usually from being up high, it has _______2________ energy.

When the object is halfway down a hill, half of the ________3_______ energy has been converted to _________4______ energy.

Both of these types of energy added together is called _________5______ energy.

1) Kinetic
2) Potential
3) Potential
4) Kinetic
5) Mechanical

200

This is the equation for Kinetic Energy

KE = 1/2m*v²

200

This is the equation for Potential Energy.

PE=mgh

200

Draw a rollercoaster with a high starting point and one hill.

Label where the following energy types are highest AND lowest:
GPE
KE

Top of track = Highest GPE, Lowest KE

Bottom of track = Lowest GPE, Highest KE

300

Explain why an object cannot rise higher than its initial position when no extra force is applied.

Where does energy "escape" to when objects are in motion?

Energy is lost as heat, sound, etc.

300

Calculate the Kinetic Energy: (1/2m*v²)
A ball with a mass of 13 kg moving at 20 m/s.

KE = 2600 J

300

Calculate the Potential Energy: (PE = mgh)
A bowling ball weighing 3 kg is sitting on a cliff 14 m high.

3*9.8*14 = 411.6 J

300

Calculate the energy when the cart is halfway down a hill.
A cart on a rollercoaster is halfway down a hill. The height of the hill is 121 meters and the cart weighs 45kg. (PE = mgh)

54*9.8*121 = 53,361 J
53,361 / 2 = 26,680.5 J

400

Calculate the Kinetic Energy: (1/2m*v²)
A Formula One car weighing 798 kg moving at 322 kmh.

KE = 41,369,916 J

400

Calculate the Potential Energy: (PE = mgh)
A diver weighing 52 kg is standing on a diving board 100 m high. They over rotate and accidentally do a belly flop. OUCH.

52*9.8*100 = 50,960 J

500

Calculate the Kinetic Energy: (1/2m*v²)
SpaceX which weighed 549,054 kg reached a speed of 20,496 kph while launching into space.
(HUGE NUMBER FOR AN ANSWER)

1.153249537 x 10^14
115,324,953,700,000 J

500

Calculate the Potential Energy: (PE = mgh)
Air Force One (Presidential Airplane) weighs 377,842 lbs. (convert to kg, 1 kg = 2.2 lbs.) is in flight 11,610 m in the air.
(HUGE NUMBER FOR AN ANSWER)

Calculate the Potential Energy: (PE = mgh)
Air Force One (Presidential Airplane) weighs 377,842 lbs. (convert to kg, 1 kg = 2.2 lbs.) is in flight 11,610 m in the air.

377,842 / 2.2 = 171746.37 kg
1.954095849 x 10^10 J
171746.37 * 9.8 * 11610 = 19,540,958,490 J