Work is the product of a force moving an object a given distance

For a force to be doing work, it must act in the same ___________ as the ______________ of the object. directionforce

Work = force x distance w = f x d

joules

Power is the rate of doing work

Power = Work / Time

Watts

Potential Energy Energy that is stored and waiting to be used later Kinetic Energy Energy in motion

Gravitational Potential Energy Energy due to your position or height off the ground. Elastic Potential Energy Energy in an object that is stretched or compressed.

KE = ½ m∙v 2 Speed or velocity Mass of object Kinetic Energy KE = Joules (J) m = kg v = m/s

PE = m∙g∙h Height gravity Potential Energy PE = J m = kg g = 9.8 m/s 2 h = m Mass of object

The bowling ball has a mass of 70 kg and is 70 m in the air. How much potential energy does it have? 48,020 J

The bowling ball is dropped. After a few seconds the ball is traveling at 8 m/s. What is the ball’s kinetic energy at this point? 2,240 J

The bowling ball finally comes to rest on Mr. Holbrook’s car. What is the bowling ball’s kinetic energy at this point? 0 J

Mechanical: Energy associated with the motion and position of objects Thermal: Total potential and kinetic energy of all microscopic particles Chemical: Energy stored in the bonds of compounds Electrical: Energy associated with electric charges Electromagnetic: Energy that can travel thru space in the forms of waves Nuclear: Energy associated in the atomic nuclei

Energy can be converted from one form to another form

Energy can not be created or destroyed it can only change forms.

You serve a volleyball with a mass of 15 kg. The ball leaves your hand with a speed of 44 m/s. a.The ball has what type of energy? b.Calculate it. a. kinetic b.14,520 J

A car is traveling with a velocity of 54.4 m/s and has a mass of 1,235 kg. a.The car has what type of energy? b.Calculate it. a. kinetic b.1,827,404.8 J

There is a bell at the top of a tower that is 45 m high. The bell weighs 221 kg. The bell falls and travels at a velocity of 51 m/s. Calculate the potential and kinetic energy of the energy of the bell. PE = 97,461 J KE = 287,410.5 J

What type of energy is present on each letter below? The coaster starts from rest at point “w” and begins to move down the track.

Work = force x distance W = 5 N x 5 m W = 25 joules

Weight = mass x 9.8 m/s 2 Weight = 50 kg x 9.8 m/s 2 Weight = 490 newtons

Power = (force x distance) / time P = (20 N x 5 m) / 3 s P = watts

 Any Questions? Good Luck and Study !!