WORK and WORK and ENERGYENERGY

Working with ForcesFORMULAE

F = MA

W= mg

M = F/A

A = F/M

Constant:

Acceleration due to gravity

9.8 m/sec/sec

MATTERThe stuff that makes up all things is called matter.

Matter is defined as anything which:

takes up space and has mass.

Amount of substance in an object

Click on this link: http://www.youtube.com/watch?v=grWG_U4sgS8&feature=related

Weight Vs. Mass

Weight and Mass

Weight is a measure of the force of gravity on an object

Weight = Mass x acceleration due to gravity

w= mg

m

w

g

W = m x g

M = w /g

Mass kilogramsAcceleration m/sec/secforce newton (N)

1N = 1 kg x 1 m/sec/sec

Unit of Force

Work

Click on this link:

http://www.youtube.com/watch?v=IvcOYOO0Fvw&feature=related

WORKWORK

A force acting through a distance

Work = Force x Distance

FORCE

DISTANCE

Work = force x distance

W = F d

Work = F (N) x D (m)

= Newton-meter or joule (J)

WORKWORK

A force acting through a distance

Work = Force x Distance

FORCE

DISTANCE

Work = force x distance

W = F d

Work = F (N) x D (m)

= Newton-meter or joule (J)

Do you do more work going straight up a mountain or taking the longer scenic route around to the top?

AB

Work = Force (N) x D (m)

or W= Fd

“Kennon or Marcos Road?"

Title/Aim: Do you do more work going straight up a mountain or taking the longer scenic route around to the top?

Hypothesis

Variables

Procedure

Blank Tables

Table showing effect of Distance on Force

Distance D/m

Force of Car F/NWork

W= F x DTrial 1 Trial 2 Trial 3 Average

0.5      

0.60.7      

0.8      

0.9      

1.0      

SUMMARY OF CONCEPTS:

•If h is doubled, the GPE is doubled.

If H is tripled, the GPE is also tripled.

•If speed (velocity) is doubled (2x), the Kinetic Energy increases (4x or 22).

If speed (velocity) is tripled (3X), the KE increases 9x or 32.

• The GPE at the top changes to KE at the bottom.

GPE = w x h or GPE = mgh