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Physics: P2 > P2.2 The kinetic energy of object speeding up or slowing down > Flashcards

P2.2 The kinetic energy of object speeding up or slowing down Flashcards

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1
Q

When a force causes an object to move through…

A

A distance work is done

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2
Q

What is the equation for work done?

A

W = F x d

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3
Q

What does w stand for?

A

Work done

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4
Q

What is work done measured in?

A

Joules

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5
Q

What does the d stand for?

A

The distance moved in the direction of the force in metres

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6
Q

What is transferred when work is done?

A

Energy

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7
Q

What is power?

A

The work done or energy transferred in a given time

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8
Q

What is the equation fro power?

A

E
P = —–
t

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9
Q

What is power measured in?

A

Watts

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10
Q

What does the E stand for?

A

The energy transferred in joules

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11
Q

What happens when an object is raised vertically?

A

Work is done against gravitational force and the object gains gravitational potential energy

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12
Q

What is the equation for change in gravitational potential energy?

A

Ep = m x g x h

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13
Q

What does Ep stand for?

A

Change in gravitational potential energy in joules

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14
Q

What does g stand for?

A

Gravitational field strength in N/kg

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15
Q

What does h stand for?

A

Change in height in metres

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16
Q

What does the kinetic energy of an object depend on?

A

Its mass and its speed

17
Q

What is the equation to find the kinetic energy?

A

1
Ek = —– x m x v2
2

18
Q

What does Ek stand for?

A

Kinetic energy in joules

19
Q

What does v stand for?

A

Speed in m/s

20
Q

What is momentum?

A

The tendency of a moving object to keep moving in the same direction, it is a property of moving objects

21
Q

What is the equation for momentum?

A

p = m x v

22
Q

What does the p stand for?

A

Momentum in kilograms metres per second, kg m/s

23
Q

In a closed system what is the total momentum before an event compared to the total momentum after the event?

A

Equal / the same

24
Q

What is the name for when the total momentum is the same before and after?

A

Conversion of momentum

Physics: P2 (6 decks)

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