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# KS3 Forces Motion

### KS3 Forces and effect on movement

What is a force ? a force is a push or pull movement
What unit measures force? newtons
name contact forces friction, upthrust, air resistance
name non-contact forces gravity, magnetic field
Define upthrust upthrust is the upward force that a liquid or gas use on a body floating in it.
Define gravity is the force that attracts a body towards the centre of the earth
what is friction? friction is a force that slows you down, created when one object rubs against another!
what is air resistance? air resistance is the opposite force to movement and air resistance is created by particles!
Explain why air resistance increases when you move faster? more particles
Which force pulls you down when sky-diving? gravity
Which force slows you down while sky-diving? air resistance
When you drive in a car, which force hits against a car? air resistance
Where does upthrust occur? in water
Which force keeps us on the ground so we don’t float away? gravity.
In which direction does gravitational force apply downwards
Suggest what would happen to the weight and to the mass of an astronaut who travelled to space the weight will be the different because only the mass does not change but when you are in space your weight changes it becomes lighter.
Describe and explain what happens to air resistance as you move faster air resistance increases as there are more particles to hit you
Why do dolphins have a streamlined shape it enable them to move through water with the least possible water resistance.
What happens to the air resistance when the parachute is opened when the parachute opens the air resistance will become much greater which slows the person riding it
What happens to the forces on a skydiver when the parachute opened for a few seconds As his speed reduces the air resistance will become less and eventually the forces will be the same again.
When you jump out of a plane and you open your parachute, describe the forces on you and your speed after a few minutes opening it? forces (air resistance and gravity) are balanced and you are moving at a constant speed.
Explain the difference between mass and weight Weight is the force that pulls you down; mass is the Number of atoms in the body
What will be different on the moon than on the earth: mass or weight? The weight! The mass measures the number of atoms in a body. That will NOT change on the Moon: you stay the same mass!
What is the force that keeps you afloat in water? Upthrust
What can you do to make a car go faster? Streamlining
Forces can make things change shape, speed or direction true or false True
When are forces balanced? Forces are balanced when they are equal in SIZE but opposite in DIRECTION: the forces cancel each other out.
When are forces unbalanced? Forces are unbalanced when two forces are opposite in DIRECTION and one has a bigger SIZE than the other
Which of either the moon or the earth has more gravity? The Earth
fill in the blank: if the forces on an object are balanced and the object is ............., then it will remain stationary answer is stationary
What is the effect of unbalanced forces on a moving object? direction may change, or the object may slow down, or it may accelerate(go faster)
This person is pushing down on the chair with force of 650N. What other force is acting to make it balanced Reaction of the floor
In a tug of war, when one team is pulling with a force of 100 N to the left and the other 80 N to the right, what is the net force? Answer: 20N to the left
A car is moving at a constant speed and the thrust of the engine is 500N forward. How big is the friction? because the car is moving at a constant speed, it means that the forces are balanced. So friction is 500N backwards.
A car is moving faster (accelerating) and the thrust of the engine is 700N forward. How big is the friction? because the car is moving FASTER, it means that the forces are UNbalanced. So friction is less than 700N backwards.
A car is slowing down (decelerating). Compare the SIZE of thrust of the engine and friction because the car is moving SLOWER, it means that the forces are UNbalanced. As the car is slowing down, it means that the backwards force is bigger: so friction is more than the thrust of the engine.
What are the 4 forces on a car moving at a steady/constant speed Gravity, Push of the floor, Thrust of engine, Air resistance/friction
Compare the size of the 4 forces on a car moving at a STEADY/CONSTANT speed Gravity is the same size as Push of the floor. Thrust of engine, is the same size as Air resistance/friction
What are the 2 forces on a stationary car Gravity, Push of the floor
Compare the SIZE of the 2 forces on a stationary car Gravity and Push of the floor are the same SIZE
Created by: ursulinephys