Independent variable

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

Speed

Distance divided by time

Control variable

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

How do the gas particles move in a ballon?

The gas particles in a balloon move randomly.

Decelerates

Gets slower

Accelerates

Gets faster

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

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

Dependent variable

The effect. A variable being tested and measured in a science experiment.

Plotted on the y-axis.

Lever

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

Moment of force

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

Moment

Moment=force x perpendicular distance

Low pressure

Wide tyres on a tractor

Skiing

Flat-footed camel

Working with snow shoes

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

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

What is exerted on the walls of the balloon?

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

This is the pressure that keeps the balloon inflated.

This is the pressure that keeps the balloon inflated.

What is the Pressure From solids?

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

Pressure

Pressure=force divided by area

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

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

High pressure

Studded football boots

Stapling paper

Biting an apple

Using scissors

Constant speed

Stays at the same speed.

When area increases?

Pressure decreases

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

100 N/cm squared

How can you lie on a bed of nails?

Because your weight is distributed evenly over a large area.

Where would you find the largest pressure?

At the bottom of the ocean.

How do you calculate pressure?

Pressure = force/area

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 fat cow with small feet

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

10 m/s

What is speed?

How much distance is covered over a period of time.

What is the formula to calculate speed?

Speed=distance divided by time

V = s/t

How do you calculate moment of force?

Moment = force x distance

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

Gas particles have more kinetic energy than solid particles.

When force increases?

Pressure increases

Total distance divided by total time is?

Average speed

What is a control variable?

A variable that must be kept the same.

What is an independent variable?

The variable you change to see what happens.

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

Brake condition