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
