Sub title 500 100 200 300 100 300 200 300 200 100 200 500 300 100 400 Potential Energy Work Work-...

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Transcript of Sub title 500 100 200 300 100 300 200 300 200 100 200 500 300 100 400 Potential Energy Work Work-...

Sub title

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Potential Energy

WorkWork-Energy

Theorem

Kinetic Energy

Power

200

Work-Power-Energy

If a force of 1000 N is exerted on a building that does not

move how much work is done?

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No work is done because there is no

displacement.

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The equation for work is ________________?

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W = F d

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What is the correct unit for work and its abbreviation?

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joule (J)

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How much work is done if you raise a 2 N weight 1.5 m above the ground?

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3 J

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Who does more work:A 40 kg man who climbs 2.0 m or a 35 kg woman

who climbs 2.5 m?

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The woman did 857.5 J of work and the man did 784 J of work.

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The unit for power is _________?

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Watt

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In order to find power you must have 2

variables. What are they?

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Work and time

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The unit of power is the watt. What is the unit

equivalent to one watt?

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One joule per second

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How much power is developed by an electric motor that moves a 200 N load a distance of 80

m in 7 s.

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2285.6 W

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How much power is generated by a machine

in lifting 100 kg a distance of 125 m in

38 s.

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3,223 W

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The unit for Kinetic Energy is __________?

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joule (J)

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If velocity doubles what happens to the total amount of KE?

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It quadruples

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A 5 kg mass moving at 10 m/s has how

much KE?

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250 J

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In order to find the KE of a 2kg skateboard traveling a

distance of 100m, what measuring device would

you need?

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A stopwatch

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A child has a mass of 35 kg and total KE of 180 J, what is their velocity?

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3.2 m/s

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Change in KE is equal to ______________?

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Work

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KE final minus KE initial is equal to what?

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Change in KE or delta KE

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If a 2kg ball starts at rest and then accelerates to 5m/s, how much work was done on the ball?

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25 J

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If work done on an object is negative, what

is happening to it’s velocity?

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The velocity is decreasing.

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If a 1000kg car starts at 20m/s and then

speeds up to 35m/s how much work has

the engine done?

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412,500 J

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The symbol for gravitational potential energy is _________?

And for elastic potential energy? __________

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PEg

&

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Does a large mass or a small mass held at the same height have

more PE?

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The large mass has more PE

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Name the 3 components needed to calculate

gravitational PE & the 2 components to calculate

elastic PE.

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Mass (m), acceleration due to gravity (g) and height (h) & spring constant (k) and

distance stretched or compressed (x)

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A 45kg diver is at the top of a 10m

platform. What is her PEg?

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4410 J

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A spring has a spring constant of 52.4 N/m and

is stretched 8 m. How much PEelastic is stored in

the spring?

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1676.8 J

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