Kinetic Energy Lesson

Explain the work-energy theorem, including the direction energy moves and how it relates to positive and negative work.

the work-energy theorem states that the change in kinetic energy is equal to the work done on the object. when velocity changes, kinetic energy also changes. when work is positive, environment did work on the object. the energy of the system increases

A 600 kg car is at rest, and then accelerates to 5 m/s. What is its original kinetic energy? J What is its final kinetic energy? J How much work was used? J

0, 7500, 7500

A 50 kg cheetah has 3,600 J of kinetic energy. What is its velocity? m/s

12

A 60 kg bicyclist going 2 m/s increased his work output by 1,800 J. What was his final velocity?

8

Kevin, whose mass is 80 kg, is moving along at a velocity of 4 m/s. He doubles his velocity by going down a hill. How much kinetic energy does he have after going down the hill? J

2560

A car with a mass of 600 kg is traveling at a velocity of 10 m/s. How much kinetic energy does it have? The car has __________J of kinetic energy.

30000

The velocity of a 1.3 kg remote-controlled car is plotted on the graph. The work of segment A is

585

An 80 kg skateboarder moving at 3 m/s pushes off with her back foot to move faster. If her velocity increases to 5 m/s, what is her change in kinetic energy as a result? __________J How much work did she perform? __________________J

640 640

An 82 kg jogger has 810 J of kinetic energy. What is the jogger's velocity? 4.4 m/s 9.9 m/s 19 m/s

A

The mass of car 2 is twice the mass of car 1. If both cars have the same velocity, how does the kinetic energy of car 2 compare to car 1? Car 2 has four times the kinetic energy. Car 2 has twice the kinetic energy. Both cars have the same kinetic energy. Both cars increase in kinetic energy if they slow down.

B

Assume the objects listed below have the same velocity. Which object has the most kinetic energy? a bus a car a plane a bicycle

C