Potential and Kinetic Energy…

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Kinetic and Potential Energy

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Presentation transcript:

Potential and Kinetic Energy… http://www.youtube.com/watch?v=qZ4FFWvZtyo kinetic energy: is the energy which an object possesses due to its motion Potential energy: energy stored in a system because of its position.

Potential Energy

Gravitational Potential Energy Potential Energy is it has the ability to do work because of position or state. The energy of an object due to its position above the surface of the Earth. Ep = W Potential energy equal to work done! Ep = Fd http://www.youtube.com/watch?v=DMrnAcnsvKY

Example

Change in gravitational potential energy depends only on change in vertical height.

Elastic Potential Energy The energy from a spring being altered from its standard shape. k: spring constant x: distance spring is stretched or compressed. http://www.youtube.com/watch?v=Jnj8mc04r9E

Example 2 An apple of mass 0.10 kg is suspended from a vertical spring with spring constant 9.6 N/m. How much elastic potential energy is stored in the spring if the apple stretches the spring 20.4 cm?

Example 2 An apple of mass 0.10 kg is suspended from a vertical spring with spring constant 9.6 N/m. How much elastic potential energy is stored in the spring if the apple stretches the spring 20.4 cm?

Example 2 An apple of mass 0.10 kg is suspended from a vertical spring with spring constant 9.6 N/m. How much elastic potential energy is stored in the spring if the apple stretches the spring 20.4 cm?

Example 2 Follow-Up How much gravitational potential energy did the apple lose?

Example 2 Follow-Up How much gravitational potential energy did the apple lose?

Example 2 Follow-Up How much gravitational potential energy did the apple lose?

Example 2 Follow-Up How much gravitational potential energy did the apple lose?

Pg. 178 # 1-9

Kinetic Energy The energy due to the motion of an object http://www.youtube.com/watch?v=BGmUVoX5s58 begin at 43sec The energy due to the motion of an object A scalar quantity

A 0. 300kg ball is pushed horizontally at a velocity of 20. 0 m/s N A 0.300kg ball is pushed horizontally at a velocity of 20.0 m/s N. What the Ek of the ball as it moves?

The kinetic energy of a moving object is 950 J as it moves 14. 2 m/s The kinetic energy of a moving object is 950 J as it moves 14.2 m/s. What is its mass?

Example 6.5 On a highway, a car with mass of 1200kg and a Ek of 2500 J. What must the velocity of the car be?

Practice Pg. 179 # 4-5 Pg. 181 # 6-7 Pg. 182 #1-3, 5-7,