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Physics- year 8 > Forces and Motion > Flashcards

Forces and Motion Flashcards

1
Q

What is the equation which links speed, distance and time?

A

Speed= distance / time

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2
Q

What is a very common unit of speed?

A

metres per second

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3
Q

What is the equation to calculate average speed?

A

Average Speed = Total Journey distance ÷ Total time taken

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4
Q

What is the speed of sound in the air?

A

330m/s
1188 km/h

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5
Q

What is the speed of light in the air?

A

299,792,458m/s
or 1079252848.8 km/h
Or 300,000,000m/s

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6
Q

What is the equation to find out the time taken?

A

time taken = distance travelled ÷ speed

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7
Q

How much is 1m into km, cm, and mm

A

.001km, 100cm, 1000mm

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8
Q

How much is one hour in minutes, seconds, and days?

A

60 minutes, 3600 seconds, 0.41666 days

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9
Q

What is accuracy?

A

how close your measurement is to the true/accepted value.

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10
Q

What is precision?

A

How close your measurements are to each other, having more significant figures makes it more precise.

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11
Q

How do you calculate percentage error?

A

(our value)-(True value) divided by true value, then x by 100.

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12
Q

What are reaction times?

A

Normally human reaction time is from 0.2 secs and above.

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13
Q

What does a straight line mean in a distance time graph?

A

stationary (not gay)

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14
Q

Does the steepness of the line effect the gradient?

A

yes, the steeper the line the bigger the gradient, and the bigger the gradient, the faster the speed

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15
Q

What does a horizontal line mean in a distance time graph?

A

zero gradient = zero speed

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16
Q

What is the equation to find the gradient in a distance time graph?

A

Gradient = (change in distance) divided by (change in time)
Or
(change in y value) divided by (change in x axis)

17
Q

What does the slope/line of a distance/time graph represent?

A

speed

18
Q

What does a straight, upwards-sloping line mean in a distance time graph?

A

steady speed

Physics- year 8 (2 decks)

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