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Science > Year 9 Physics Test > Flashcards

Year 9 Physics Test Flashcards

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1
Q

Independent variable

A

(The cause) The variable that is changed to test the effects on the dependent variable. Plotted on the x-axis.

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2
Q

Speed

A

Distance divided by time

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3
Q

Control variable

A

A variable that must be kept the same to prevent it affecting your results.

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4
Q

How do the gas particles move in a ballon?

A

The gas particles in a balloon move randomly.

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5
Q

Decelerates

A

Gets slower

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6
Q

Accelerates

A

Gets faster

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7
Q

A marathon runner runs the marathon (42.2km) in 2.5 hours. Calculate their average speed. Show your working.

A 
Speed = ??
Distance =42.2 km
Time=2.5 hours 
Speed=distance divided by time 
Speed=42.2km divide by 2.5
Speed=16.88km/hour
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8
Q

Dependent variable

A

The effect. A variable being tested and measured in a science experiment.
Plotted on the y-axis.

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8
Q

Lever

A

A rigid body capable of lifting a heavy load with a small effort.

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9
Q

Moment of force

A

The moment of force is the turning effect of a force.

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10
Q

Moment

A

Moment=force x perpendicular distance

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12
Q

Low pressure

A

Wide tyres on a tractor
Skiing
Flat-footed camel
Working with snow shoes

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13
Q

What do the particles do with the sides of the balloon?

A

The particles collide with the inside/side/walls of the balloon.

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14
Q

What is exerted on the walls of the balloon?

A

This causes a force to be exerted on the walls of the balloon.

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15
Q

This is the pressure that keeps the balloon inflated.

A

This is the pressure that keeps the balloon inflated.

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16
Q

What is the Pressure From solids?

A

Pressure is the force per unit that an object can exert.

17
Q

Pressure

A

Pressure=force divided by area

18
Q

The weight of 28N games console is spread over 0.25m squared. Calculate the pressure exerted by the games console. Show your workings

A 
P=? 
P=force divided by area 
Force=28N
Area=0.25m squared 
P=28 divided by 0.25
P=112/m squared
19
Q

High pressure

A

Studded football boots
Stapling paper
Biting an apple
Using scissors

20
Q

Constant speed

A

Stays at the same speed.

21
Q

When area increases?

A

Pressure decreases

22
Q

What pressure does a 4000N horse exert on the ground if each foot is 10cm squared?

A

100 N/cm squared

23
Q

How can you lie on a bed of nails?

A

Because your weight is distributed evenly over a large area.

24
Q

Where would you find the largest pressure?

A

At the bottom of the ocean.

25
Q

How do you calculate pressure?

A

Pressure = force/area

26
Q 
Which of these animals would probably cause the greatest pressure on the ground? 
A fat cow with big feet
A fat cow with small feet
A calf with big feet 
A calf with small feet
A

A fat cow with small feet

27
Q

A runner races in the 100 meter dash. It takes her 10 seconds to finish. What is her average speed?

A

10 m/s

28
Q

What is speed?

A

How much distance is covered over a period of time.

29
Q

What is the formula to calculate speed?

A

Speed=distance divided by time

V = s/t

30
Q

How do you calculate moment of force?

A

Moment = force x distance

31
Q

What is the difference between particles in a gas and a solid?

A

Gas particles have more kinetic energy than solid particles.

32
Q

When force increases?

A

Pressure increases

33
Q

Total distance divided by total time is?

A

Average speed

34
Q

What is a control variable?

A

A variable that must be kept the same.

35
Q

What is an independent variable?

A

The variable you change to see what happens.

36
Q

What are the factors that will not affect your reaction times?

A

Brake condition

Science (15 decks)

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