HON PHYSICS DAY 35 Energy again!.

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Presentation transcript:

HON PHYSICS DAY 35 Energy again!

REMIND ME Why did the roller coaster have fallback sometimes but other times did not? How did the coaster able to make it to the top usually?

Work/Energy Review…a set of ideas Remind Me: Kinetic Energy Idea: Equation: Grav. Potential Energy

The change of an energy type is called: In an isolated system, how should the total amount of energy compare before and after some time?

Kinetic Energy (1/2)m(v2) Gravitational Potential m(g)h System Energy At starting height Striking the floor

Lets Try Some In this coaster

Kinetic Energy (1/2)m(v2) Gravitational Potential m(g)h System Energy At A At B At C

THE SAME! No loss of system energy! Lets Try Some If this is an isolated system, how does the system energy at A compare to C? THE SAME! No loss of system energy!

A has MORE GPE because it is higher! Lets Try Some If this is an isolated system, how does the Potential energy due to gravity at A compare to C? A has MORE GPE because it is higher!

Lets Try Some Now lets come up with a sentence to describe what is happening to the system energy between: A and B also B and C

Would a heavier cart have more/less/same speed at C? Lets Try Some Would a heavier cart have more/less/same speed at C?

ACTIVITY

WORK! Work is not just a change in energy, but also a FORCE times a DISTANCE. We use tables to get it, usually.