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Physics Terms

100

What is energy?

The ability to work.

200

Two types of mechanical energy

Kinetic and potential

300

Energy of an object in motion

kinetic energy

400

Two types of potential energy.

Gravitation and elastic

500

The rate of doing work.

Power

Work-Energy Formulas

100

The formula for calculating work.

W = Fd

200

Formula for kinetic energy

E_k = 1/2 mv²

300

Formula for gravitational potential energy.

E_p = mgh

400

Formula for elastic potential energy.

E_{pe =} 1/2 k x²

500

Work-Kinetic Energy Formula

W_net = change in E_k

Power

100

What is power?

Rate of doing work

200

What in the SI unit of power?

Watt

300

Basic Formula for calculating power

P = W/t

400

Alternate formula for calculating power

P = Fv

500

An object with a mass of 2.0 kilograms is raised 3.0 meters in 10 seconds by a person.  Find the power exerted by the person.

5.9 watts

Basic Energy-Work Problems

100

How much work is done on a object that has a force of 18 N applied to it and it moves 5.0 m in the direction of the force?

90 Joules

200

Calculate the kinetic energy of a ball with a mass of .50 kg that is moving at 6.0 m/s.

9.0 Joules

300

Calculate the potential energy of a rock with a mass of 10 kg that is raised 5.0 m above the surface of the earth.

490 Joules

400

Calculate the elastic potential energy stored in a spring whose force constant is 10 N/m when it is stretched 2.0 m.

20 Joules

500

Calculate the velocity of a rock that falls from a height of 10 m, just before it hits the ground.

14 m/s

Complicated Energy Problems

100

A force of 10 N is applied to an object at an angle of 60 degrees above the horizontal.  The object is moved 5.0 m.  Find the work done on the object.

25 joules

200

A rock with a mass of 10 kg is dropped from a height of 12 m.  What is it potential energy when it is 2.0 m high?  What is its kinetic energy?

potential is 196 J

kinetic is 980 J

300

A force of 10 N is applied to an object causing it to accelerate and reach a velocity of 5.0 m/s.  Find the power out of the force.

50 Watts

400

A mass of 10 Kg is attached to a spring with a force constant of 5.0 N/m, and dropped so that it stretches the spring .20 meters.  If the mass is moving at .10 m/s, find the total energy of the system.

.15 joules

500

Easy daily question:  Who is your Physics teacher?

Mr. Sauber (RAS)