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PPT – Energy Problems PowerPoint presentation | free to download - id: 12ff52-NjFkM

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Energy Problems

- Review for Potential energy, Kinetic energy,

Total Energy work, power.

Conservation of energy

- Energy cannot be created or destroyed. It can be

transformed from one form to another, but the

total amount of energy never changes.

Example

- When a roller coaster goes down a hill some

energy is lost through friction. Not really, it

simply transforms to heat and sound.

Potential Energy

- PE mgh
- Where
- Pe Energy in Joules
- m mass (in kilograms)
- g gravitational acceleration of the earth (9.8

m/sec2) - h height above earth's surface (in meters)
- A cart is loaded with a brick and pulled at

constant speed along an inclined plane to the

height of a seat-top. If the mass of the loaded

cart is 3.0 kg and the height of the seat top is

0.45 meters, then what is the potential energy of

the loaded cart at the height of the seat-top?

Answer PE aprox 13.5 Joules

Kinetic Energy

- KE (1/2)mv2
- Where
- KE Energy (in Joules)
- m mass (in kilograms)
- v velocity (in meters/sec)
- Determine the kinetic energy of a 1000-kg roller

coaster car that is moving with a speed of 20.0

m/s.

Answer KE 200,000 Joules

Kinetic to Potential

- KE1000 PE500
- KE500 PE1000
- KE0 PE 1500

Total Energy

- TeKePe
- Where
- Te total energy
- Ke kinetic energy
- Pe potential energy
- A roller coaster starts falling from a height of

50 m. When the roller coaster hits the the 1st

drop it is still 20 meters above the ground. What

would the KE and PE energy be at this point? And

what is the velocity? - Roller coaster 200 kg

Work

- Work
- Two things enter into into every case where work

is done - The application of force
- And the movement of something
- WFD
- F force D Distance
- Work is measured in Joules
- Force in Newtons
- Distance in meters

Examples

- Carrying something up stairs, lifting anything,

etc. - How much work is a person using if he pushes a

block with a force of 6N for 10 meters? - F (6)(10)
- F60 Joules

Power

- The rate at which work is done
- Measured in Watts
- Power Work done/ time interval
- Examples- lifting weights, climbing stairs, etc.
- Question if a forklift is replaced with a new

forklift that has twice the power, how much

greater a load can it lift in the same amount of

time?

Quiz Questions

- How much work is done on a 100 N boulder you

carry horizontally across a 10 meter room? - No work . its carried horizontally
- How much work is done if the boulder is lifted 1

meter? - (100N)(1m) 100 J

Quiz Questions

- What's the power expended when a 500 Newton

barbell Is lifted 2.2 m in 2 sec? - Pwork/time interval
- W (2.2m)(500N) 1100 J
- P 1100J/ 2 sec 550 Watts

Questions

- What is the KE of 3kg toy that moves at 4m/s ?
- KE .5mv squared
- KE (.5) 3kg (4m/s) squared
- KE 24 J

Questions

- a 5kg toy is dropped from the top of a building.

Just before the toy hits the ground its KE is

7000 Js . How tall is the building? - SO.
- PE 7000 M 5kg H ? G 9.8
- 7000 5kg (9.8) (?)
- H 142.85 m

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