Year 9 Physics Test

Question 1

Independent variable

Answer 1

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

Question 2

Speed

Answer 2

Distance divided by time

Question 3

Control variable

Answer 3

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

Question 4

How do the gas particles move in a ballon?

Answer 4

The gas particles in a balloon move randomly.

Question 5

Decelerates

Answer 5

Gets slower

Question 6

Accelerates

Answer 6

Gets faster

Question 7

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

Answer 7

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

Question 8

Dependent variable

Answer 8

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

Question 8

Lever

Answer 8

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

Question 9

Moment of force

Answer 9

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

Question 10

Moment

Answer 10

Moment=force x perpendicular distance

Question 12

Low pressure

Answer 12

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

Question 13

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

Answer 13

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

Question 14

What is exerted on the walls of the balloon?

Answer 14

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

Question 15

This is the pressure that keeps the balloon inflated.

Answer 15

This is the pressure that keeps the balloon inflated.

Question 16

What is the Pressure From solids?

Answer 16

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

Question 17

Pressure

Answer 17

Pressure=force divided by area

Question 18

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

Answer 18

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

Question 19

High pressure

Answer 19

Studded football boots
Stapling paper
Biting an apple
Using scissors

Question 20

Constant speed

Answer 20

Stays at the same speed.

Question 21

When area increases?

Answer 21

Pressure decreases

Question 22

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

Answer 22

100 N/cm squared

Question 23

How can you lie on a bed of nails?

Answer 23

Because your weight is distributed evenly over a large area.

Question 24

Where would you find the largest pressure?

Answer 24

At the bottom of the ocean.

Question 25

How do you calculate pressure?

Answer 25

Pressure = force/area

Question 26

``` 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 ```

Answer 26

A fat cow with small feet

Question 27

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

Answer 27

10 m/s

Question 28

What is speed?

Answer 28

How much distance is covered over a period of time.

Question 29

What is the formula to calculate speed?

Answer 29

Speed=distance divided by time | V = s/t

Question 30

How do you calculate moment of force?

Answer 30

Moment = force x distance

Question 31

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

Answer 31

Gas particles have more kinetic energy than solid particles.

Question 32

When force increases?

Answer 32

Pressure increases

Question 33

Total distance divided by total time is?

Answer 33

Average speed

Question 34

What is a control variable?

Answer 34

A variable that must be kept the same.

Question 35

What is an independent variable?

Answer 35

The variable you change to see what happens.

Question 36

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

Answer 36

Brake condition