P9 Motion Flashcards

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1
Q

What does the gradient of a line on distance-time graph represent?

A

Speed

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2
Q

State the equation linking distance, speed and time

A

distance = speed x time
distance (m), speed (m/s), time (s)

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3
Q

How to calculate speed for an object moving at constant speed

A

speed = distance / time
speed (m/s), distance (m), time (s)

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4
Q

Why can an object travelling at a constant speed in a circle not have a constant velocity?

A
  • Speed is a scalar quantity
  • Velocity is a vector quantity which means it can only be constant if the direction is constant
  • In circular motion, the direction is constantly changing
  • So its velocity is not constant even if its speed is constant
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5
Q

How to calculate acceleration

A

acceleration = change in velocity / time taken for change
acceleration (m/s²), change in velocity (m/s), time (s)

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6
Q

What is velocity?

A

Speed in a given direction

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7
Q

How can distance travelled by an object be calculated from a velocity-time graph?

A

Distance travelled is equal to the area under the graph

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8
Q

What is acceleration?

A

The rate of change of velocity

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9
Q

What is deceleration?

A

The change of velocity per second when an object slows down

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10
Q

How can acceleration of an object be calculated from a velocity-time graph?

A

Acceleration is equal to the gradient of the line

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