Physics WPE Flashcards

1
Q

Conservative Force

A

Dosen’t interfere with energy of a system

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2
Q

Non conservative force

A

Takes away or adds to the energy of a system

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3
Q

What are the only two conservative forces

A

Gravity and Spring

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4
Q

Unit for work

A

Joules

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5
Q

Unit for power

A

Watts

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6
Q

Who does more work when climbing stairs?

A

Everyone does the same amount of work if the stairs are the same height

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7
Q

Who has more power when climbing up stairs?

A

The person with more mass and in less time

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8
Q

If a force increases KE, it does______ work

A

Positive

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9
Q

If a force decreases KE, it does ______ work

A

Negative

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10
Q

Work formula

A

Force x displacement

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10
Q

Work energy theorem

A

PE + KE + W = PEf + KEf

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11
Q

PE formula

A

Mass x height x gravity

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12
Q

KE formula

A

1/2 x mass x Velocity squared

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13
Q

Is work scalar or vector

A

Scalar

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14
Q

Is power scalar or vector

A

Scalar

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15
Q

Is energy scalar or vector

A

Scalar

16
Q

Scalar

A

Only magnitude not direction

17
Q

Vector

A

Magnitude and direction

18
Q

Formula for power

A

Work divided by time

19
Q

As an object goes up it’s PE ______

A

Increases

20
Q

As an object goes down it’s KE _____

A

Increases

21
Q

On the ground PE is always

A

0

22
Q

For staircase problems, if the object moves off the top, how do you find its PEf

A

Add the number of Joules to the total PE

23
Q

What happens if an object speeds up

A

It loses PE and gains KE

24
Q

When does a force not do work

A

If it gets cancelled out or the object doesn’t move

25
Q

If displacement and force are the same

A

Energy is added and work is positive

26
Q

If displacement and force are in opposite directions

A

Energy is remove and work is negative

27
Q

how to find work

A

N x Distance

28
Q
A