Speed Flashcards

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1
Q

What is the difference between a distance and a displacement?

A

Distance is a scalar quantity and only has a magnitude (size)
Displacement is a vector quantity and has both magnitude and direction

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2
Q

What is the difference between speed and velocity?

A

Speed is a scalar quantity and only has a magnitude (size), velocity is a vector quantity and has both magnitude and direction

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3
Q

What factors can affect the speed at which someone walks, runs or cycles?

A

Age, fitness, terrain and distance travelled

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4
Q

What are typical speeds for a person walking, running and cycling?

A

Walking - 1.5 m/s
Running - 3.0 m/s
Cycling - 6.0 m/s

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5
Q

What are typical speeds of a car and a train?

A

Car - 13-30 m/s

Train - 50 m/s

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6
Q

What is the typical speed for sound travelling in air?

A

330 m/s

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7
Q

What is acceleration?

A

Change in velocity of an object per second

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8
Q

What is the unit of acceleration?

A

m/s^2

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9
Q

How can an object be accelerating even if it is travelling at a steady speed?

A

If it is changing direction

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10
Q

What is happening to an object if it has a negative acceleration?

A

It is slowing down

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11
Q

What information does the gradient of the line in a distance-time graph provide?

A

Speed

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12
Q

What information does the gradient of the line in a velocity-time graph provide?

A

Acceleration

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13
Q

How can the distance travelled by an object be found from its velocity-time graph?

A

Calculate the area under the graph

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14
Q

What is the acceleration of a free-falling object due to gravity?

A

~9.8 m/s^2

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15
Q

What is the name for the steady speed a falling object reaches when the resistive force is equal to its weight?

A

Terminal velocity

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16
Q

What is the general name for the frictional forces an object experiences when moving through a fluid (liquid or gas)?

A

Drag

17
Q

In which direction does the drag on an object always act?

A

In the direction opposite to which the object is moving

18
Q

What happens to the drag on an object as its speed increases?

A

Drag increases

19
Q

What can be done to reduce the drag on an object?

A

Streamlining