Energy Review.

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Presentation transcript:

Energy Review

A car is traveling with an increasing velocity towards the west down a ramp. What is the energy’s Direction?

Energy does not have a direction

What units are used to measure energy?

Joules (J)

What does the law of conservation of energy state?

Energy can not be created or destroyed but can be transformed.

If you raise a 173 kg mass from sea level to 366 m above sea level, how much have you increased GPE?

620, 516 J

Find the kinetic energy of a 4 kg rock falling at 5 m/s.

50 J

If a suburban and a miata are going the same speed, the suburban weighs 3 times more, how much more kinetic energy does the suburban have?

3

Two Miatas are traveling down the road Two Miatas are traveling down the road. The silver one is going 3 x as fast as the red one. How many times more kE does the silver have than the red?

9

At which point does the ball have the most potential energy?

A

IF you apply 40 N of force on an object over 3 m, how much work have you done?

120 J

A 5 kg rock is sitting on the edge of a cliff A 5 kg rock is sitting on the edge of a cliff. If the PE is 1200 J, how far above the ground is the rock?

What is the mass of an object with KE of 254 What is the mass of an object with KE of 254.8 J and a velocity of 14 m/s?

2.6 kg

Some energy in every system or transformation is lost as _____________.

Thermal Energy

What formula would be used for finding kinetic energy just before an object hits the surface?

E k final = e g initial + E k Initial