Unit 4 Review

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What is the kinetic energy of a 44kg cheetah running at 31 m/s?

21,142J

Kinetic energy (KE)

the energy of an object due to the object's motion.

Gravitational Potential Energy (GPE)

Energy that is due to the gravitational forces between objects. One can also say GPE is energy due to position above the surface of the earth.

Elastic Potential Energy

Energy that is stored by compressing or stretching an object

Energy is measured in?

Joules (J)

Formula to solve for kinetic energy

KE= 1/2(mass x velocity^2)

When ever work is done, energy is _____________ or is _____________ from one system to another.

Transformed, or is Transferred.

A book weighing 14 N is lifted 2 meters. How much work is done?

W= Fd = (14N)(2m)= 28J

Units for power

Watt (W)

The Potential Energy Formula

PE= m x g x h

Chemical Potential Energy

Energy that is due to chemical bonds

The amount of kinetic energy an object has depends on 2 things

The mass of the object, and The velocity at which it is moving

If a 60 watt light bulb does 216,000 J of work, how long has it been turned on?

t=w/p 216,000J/60W = 3,600s

Energy

the ability to do work

Find the kinetic energy of a 50 kg swimmer, swimming at a speed of 4m/s.

400J

Find the potential energy of a 50 kg diver on a 15 meter cliff.

7,350J

System

A group of objects and the factors that affect those objects.

The Law of Conservation of Energy

Energy cannot be created or destroyed

If it takes you 10s to do 150 J of work on a box to move it up a ramp, what is your power output?

P= W/t= (150J)/(10s) = 15W

Formula for power

Power = work/time (P=W/t)

Power

The amount of work done in a certain period of time

Formula for work

Work = force x distance (W=Fd)

Potential energy

energy that is stored due to the interaction between objects.

What is work?

is done on an object when the object moves in the same direction in which the force is exerted.

Units for work

joules (j)


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