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PE - Year 13 > 4.1 Linear motion > Flashcards

4.1 Linear motion Flashcards

1
Q

Define scalar quantity

A

Quantities that just have size

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2
Q

Define vector quantities

A

Quantities that have size and direction

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3
Q

Define mass

A

The quantity of matter the body possesses

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4
Q

Define weight

A

The gravitational force exerted on an object

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5
Q

How is weight calculated?

A

Mass x gravity (9.8)

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6
Q

Define distance

A

The path a body takes as it moves from start to finish

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7
Q

Define displacement

A

The shortest route in a straight line between the start and finish points

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8
Q

What quantity is displacement?

A

Vector

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9
Q

Define speed

A

The rate of change of direction

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10
Q

How is speed calculated?

A

Distance / time

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11
Q

Define velocity

A

The rate of change of displacement

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12
Q

How is velocity calculated?

A

Displacement / time

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13
Q

How is the gradient of a graph calculated?

A

Change in y axis / change in x axis

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14
Q

Define acceleration

A

Rate of change of velocity (m/s/s)

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15
Q

How is acceleration calculated?

A

Change in velocity / time

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16
Q

How is change in velocity calculated?

A

Final velocity - initial velocity / time

17
Q

How is momentum calculated?

A

Momentum (kgm/s) = mass x velocity

18
Q

What quantity is momentum?

A

Vector

19
Q

What are the 2 types of forces?

A

External - comes from outside the body

Internal - generated by the skeletal muscles

20
Q

What are the vertical forces?

A

Weight - the gravitational force exerted on an object

Reaction force - occurs when 2 bodies are in contact with one another

21
Q

What are the horizontal forces?

A

Friction - occurs when 2 or more bodies are in contact with one another

Air resistance - a force that acts in the opposite direction to the motion of a body travelling through the air

22
Q

What factors affect friction?

A
  • Surface characteristics
  • Temperature of surfaces
  • Mass of the sliding objects
23
Q

What factors affect air resistance?

A
  • Velocity of moving body
  • Cross sectional area of moving body
  • Shape and surface characteristics
24
Q

What is net force?

A

The resultant force acting on a body when all other forces have been considered

25
Q

Define impulse

A

The time taken for a force to be applied to an object

26
Q

How is impulse calculated?

A

Force x time

27
Q

Define net impulse

A

Combination of positive and negative impulses

PE - Year 13 (15 decks)

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