PHYSICS DAY 35 Here we go! Today: 1) 2 forms of energy

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Presentation transcript:

PHYSICS DAY 35 Here we go! Today: 1) 2 forms of energy 2) Examples, using tables, math 3) Work as an idea 4) Energy bar graphs

Go to the handout. Lets fill in some basic things:

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?

Lets See and Draw a Roller Coaster This is the TOP THRILL DRAGSTER. Height of the coaster: 420 feet tall (130m) Accelerated to a speed of 120 mph (190 km/h) in 3.8 seconds and then begins to vertically climb. 17 seconds for the ride 18 riders per train, train mass is 15 tons (13,600kg) empty. Lets see it!

5 dots correspond to different parts of the ride.

So Lets DO A Bar Graph Lets compare the bottom and top

So Lets DO A Bar Graph Lets compare the bottom and halfway up.

BUT WHAT IF IT WAS NOT ISOLATED? What would happen?

So Lets DO A Bar Graph Lets compare the bottom and top.

Lets do Some HW to understand

First thing in your detector: SLOW CONSTANT SPEED and MECHANICAL of EARTH-BOOK. Does this system include the PERSON? So should this SYSETM be isolated?