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Equations WorkEnergy

ConservationOf

EnergyPower

Force is equal to…?

Mass x Acceleration

Work is equal to…?

Force x Displacement

½ mv2= ?

Kinetic Energy

Gravitational P.E. = ?

Mass x Gravity x Height

How much work is done on a vacuum cleaner pulled 3.0m by a

force of 50.0 N at an angle of 30.0 degree angle above the

horizontal?

W=50 x 3 x (cos 30.0o)=130 J

What is the SI units of work?

N/m or Joules (J)

If there is no movement then…

…no work is done!

Work is a scalar quantity, therefore it can be…

Positive (+) or negative (-)

Work is done only when components of force are…

Parallel to a displacement

If 2.0 J of work is done in raising a .180 kg apple, how far is it

lifted?

W=fd, so W/f=d2.0 J/ 1.80 N= 1.11 m

Kinetic Energy is associated with an object…

…in motion.

Potential Energy is associated with an object…

…at rest.

The net work of an object is equal to the difference in what?

Kinetic Energy

When an external force compresses or stretches a spring, what type of energy is stored in

the spring?

Elastic Potential Energy

If a 4.00 kg object is traveling at 3 m/s, what is it’s K.E.?

K.E.=1/2 (4)(3)2

=16

State the Conservation of Energy.

Energy can not be created or destroyed, it can just change

forms.

When something is conserved, it is said that the object remains…

…constant.

Mechanical Energy of an object is equal to the sum of…

K.E. and all forms of P.E.

In the absence of _____, the total M.E. remains the same at any

point.

What is friction?

If the initial M.E. is equal to 1000 J, what is final M.E. equal to…(in the absence of friction)

1000 J

Power is measured in what units?

Watts or J/s

1 Hp is equal to _____ Watts.

What is 746

Power is determined by…

Work done over time

Power tells us ‘how _____ work is done.’

What is fast

How much power is produced by a machine that produces 1000 J

over a 6 second interval?

166.67 Watts