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Science > Forces and pressure > Flashcards

Forces and pressure Flashcards

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1
Q

What is the equation to work out the acceleration in a velocity-time graph?

A

V - U
—— = A
T

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2
Q

What does a horizontal straight line represent in a velocity time graph?

A

Constant speed

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3
Q

What does a straight ascending line in a velocity time graph represent?

A

Acceleration

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4
Q

When does a straight descending line in a velocity time graph represent?

A

Deceleration

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5
Q

How would you work out the distance traveled in a velocity time graph?

A

Work out the area

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6
Q

What units is acceleration measured in?

A

2

M/S

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7
Q

What is a moment?

A

A moment is a turning effect of a force, forces can make objects turn if there is a pivot

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8
Q

What are the units of measurement used for moments?

A

Nm, newton meters

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9
Q

On a distance time graph what does an ascending straight line represent?

A

Going away from starting point

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10
Q

In a distance time graph what does a horizontal line represent?

A

Stationary

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11
Q

What does a descending line in a distance time graph represent?

A

Going back to starting point or going past it if negative

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12
Q

What do scientists use to measure pressure?

A

A barometer

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13
Q

Is there more atmospheric pressure on a mountain or at sea level? Why?

A

At sea level because the weight of the air above compresses the air below, tighter and tighter

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14
Q

Which weather is usually associated with low pressure?

A

Wet and windy

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15
Q

What is the equation to work out pressure

A

Pressure= force divided by area

I.e.Force= newtons
Area= m2
Pressure= Pa

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16
Q

What is the conversion rate for N/m2 into Pa

A

1 N/m2=1Pa

17
Q

A block weighing 10 N rests on the floor what pressure does the block exert with dimensions of 0.1 m times 0.1 m

A

1000 Pa

18
Q

What is the unit of pressure

A

Pa

19
Q

If a metal block applies a force of 20 N and an area of 5 cm² find the pressure being applied by the block

A

4 N/cm2

20
Q

What pressure does an elephant of weight of 40,000 N exert on the ground if each of his 4 feet have a surface area of 200 cm²

A

500,000 Pa

Science (14 decks)

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