Describing Motion Along a Line Flashcards

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1
Q

state what is meant by distance

A

how far an object has travelled

distance is a scalar quantity

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2
Q

state what is meant by displacement

A

how far an object has travelled in a straight line from the starting point to the finishing point and the direction of that line
it is a vector quantity

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3
Q

explain velocity

A

the speed in a given direction

it is a vector quantity so it has both magnitude and direction

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4
Q

state some typical speeds of everyday situations: walking, running, cycling

A

walking - 1.5m/s
running - 3m/s
cycling - 6m/s

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5
Q

state the typical value for the speed of sound in air

A

330m/s

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6
Q

state what is meant by instantaneous speed

A

the speed of an object in a given moment in time

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7
Q

what are distance time graphs used for?

A

to represent the motion of an object

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8
Q

describe what is meant by acceleration

A

the rate of change of velocity

since velocity is a vector, so is acceleration

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9
Q

explain why a skydiver falls at a steady speed

A

when they jump out of a plane, they may receive terminal velocity

at terminal velocity, the skydiver’s weight is equal in size and opposite in direction to the air resistance on the skydiver

as there is no resultant force, there is no acceleration and the skydiver will fall at a steady speed

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