P4 - Speed Flashcards

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1
Q

Why are averages for speed used?

A

This is because cars can never maintain a constant speed, as they accelerate when starting up and the speed is affected by traffic. This means an average is used.

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2
Q

What is the formula for speed?

A

Speed = distance / time

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3
Q

How can instantaneous speed be found?

A

White lines are used to show the distance covered by a car in set time by a speed camera, allowing speed to be calculated.

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4
Q

Describe displacement…

A

This is the distance with a direction from its given point at a given time. This can be shown on a displacement graph and is positive or negative.

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5
Q

Describe velocity…

A

This is the speed in a set direction, such as 20 km/h due North. This is negative when a car turns around and travels in an opposite direction.

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6
Q

What is instantaneous velocity?

A

This is the speed in a set direction at a given time.

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