Speed, Velocity and Acceleration Flashcards

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1
Q

What are the units for mass?

A

The units for mass are kilograms. Newtons are the units of force.

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2
Q

What is the formula for average speed?

A

The formula for average speed is distance moved ÷ time taken. Time taken ÷ distance moved does not give us a useful value.

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3
Q

What is the vertical axis in a distance-time graph?

A

The vertical axis in a distance-time graph is the distance travelled from the start. This often has metres for units but not always.

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4
Q

What does a steep line correspond to in a distance-time graph?

A

A steep line in a distance-time graph does corresponds to a fast steady speed. The units are often metres per second. Acceleration is shown by a line that curves upwards.

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5
Q

How is velocity different from speed?

A

Velocity is speed in a given direction

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6
Q

What is the formula for acceleration?

A

The formula for acceleration is change in velocity ÷ time taken and not time taken ÷ change in velocity

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7
Q

What is the vertical axis in a speed-time graph?

A

The vertical axis in a speed-time graph is the velocity of the object. This is often, but not always, measured in metres per second.

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8
Q

What does a downwards line correspond to in a speed-time graph?

A

A downwards line in a speed-time graph corresponds to constant deceleration. This is often measured in metres per second.

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9
Q

What does the area beneath a velocity-time graph represent?

A

The area below a velocity-time graph represents the distance travelled. This is usually measured in metres.

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10
Q

If a car increases in velocity from +5 m/s to +15 m/s in three seconds, what is its acceleration?

A

The formula for acceleration is change in velocity ÷ time taken. So 10 m/s divided by 3 s is +3.3 m/s2. You have probably misplaced your decimal point.

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