The easy way to remember Speed, Distance and Time D T S Speed Distance Time Dad Stopped Thinking X ÷

A lorry leaves Hastings travelling at 30kmph it arrives at Battle. It has travelled 10km. How long has it taken to reach Battle. The calculation is 10km (D) ÷ 30kmph (S) So what is the answer?? 20mins (T)

Things are streamlined to reduce air resistance. Of course the diver on the previous page is more streamlined, this is because he has stretched out his arms and his legs causing less air resistance. Direction of travel And Gravitational Pull Air Resistance

The air resistance slows him down. The diver is aerodynamic. The particles of air around him start to move out of his way as he hits them. The air resistance is an opposite force to the Gravitational Pull. This boy is not aerodynamic there for he will travel slower than the diver.

Mass is a measure of how much matter an object has. Weight is a measure of how strongly gravity pulls on that matter. So if you were to travel to the moon your weight would change because the pull of gravity is weaker there than on Earth but, your mass would stay the same because you are still made up of the same amount of matter.

An RAF air craft is on fire. The pilot has decided to leave the plane via a parachute. He straps into the parachute and jumps out of the plane. His parachute opens. The pilot wonders while he is falling why has he not just plummeted to the ground.

When he lands he goes and talks to a Scientist. The scientist explains why he did not plummet to his death. The parachute opened out giving you a larger surface area. All the air rushing past you slowed down as it hit the parachute. The air acted as a cushion and delivered you safely to the ground. When a bird flies it opens its wings giving it a larger surface area meaning it can glide in the air.

Cars and other vehicles take time to stop depending on the speed they are going. Generally the slower the speed the shorter the distance. This rule can be altered by the amount of friction. In this case the rougher the road the longer it will take. The Highways Agency have these stopping times and distances.

Have you heard of Friction before if so click yes and I will give you a more brief description. If no I will start with basics.

Friction is the "evil" of all motion. No matter which direction something moves in, friction pulls it the other way. Move something left, friction pulls right. Move something up, friction pulls down. It appears as if nature has given us friction to stop us from moving anything. Friction is actually a force that appears whenever two things rub against each other. Although two objects might look smooth, microscopically, they're very rough and jagged.

As they slide against each other, their contact is anything BUT smooth. They both kind of grind and drag against each other. This is where friction comes from. But friction is not all bad. In fact, it has a lot to do with life as we know it here on Earth. Without it, we wouldn't be able to walk, sit in a chair, climb stairs, or use a mouse to surf the web. Everything would just keep slipping and falling all over the place. Continue

Friction is the force between two objects. It is equal and opposite. Do you understand if so don’t click here If not click here and you can read a More Basic explanation.

So next time you are in Sainsbury's and skid on the floor its because it is very smooth meaning there is less Friction.

Newton's are what force is measured in. Newton's were invented by Sir Isaac Newton. Newton’s are the units in which we measure forces. Newton's= weight Using scales= mass 1kg on earth= 10n

Objects float in water when their weight is balanced by the upthrust from the water. The object will sink until the weight of the water it pushes out of the way is the same as the weight of the object.

Gravity is pulling the books down. The table is pushing them up. The forces are equal.

This bumper car is a balanced force as it is not speeding up, slowing down or changing direction. The bumper car has a weight due to the force of gravity.

What will happen if these buggies collide? Will the blue one go to the left or the right? Left Right

Well done the blue car will move to the right because the forces become unbalanced. Continue

Hard luck! When the red car hits the blue the forces become unbalanced making the blue car move to the right. Continue

Unbalanced forces make objects speed up, slow down or change direction. In this tower drop ride this lift is held up by a rope. The force in it at the moment is balanced.

If the rope was taken away the lift would go down because the force is now unbalanced.

Between the parachute and the lift the lift will drop faster as there is less are resistance. The more air resistance the slower it will fall.

This boat is balanced in the water.

Well done you have just learnt one of Newton’s laws!!!

T S X ÷ D B

Its D T S X ÷ Speed Distance Time Dad Stopped Thinking

Well done have a shiny star!!

Rough Surface Smooth Surface

Correct Well done have a shiny star!! Continue

A ball will roll faster on a smooth surface, this is because less friction is created. In this case the more friction the slower an object will go.

What is the push or pull on an object that can cause it to accelerate called? A: mass B: force C: density D: speed

What is the unit of measure for force? A: Amp B: Seconds C: Newton D: Erg

Are mass and weight the same? A: Yes B: No

What is the push or pull on an object that can cause it to accelerate called? Force What is the unit of measure for force? Newton's Are mass and weight the same? No