KS3 Forces and effect on movement
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| What is a force ? | a force is a push or pull movement
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| What unit measures force? | newtons
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| name contact forces | friction, upthrust, air resistance
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| name non-contact forces | gravity, magnetic field
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| Define upthrust | upthrust is the upward force that a liquid or gas use on a body floating in it.
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| Define gravity | is the force that attracts a body towards the centre of the earth
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| what is friction? | friction is a force that slows you down, created when one object rubs against another!
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| what is air resistance? | air resistance is the opposite force to movement and air resistance is created by particles!
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| Explain why air resistance increases when you move faster? | more particles
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| Which force pulls you down when sky-diving? | gravity
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| Which force slows you down while sky-diving? | air resistance
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| When you drive in a car, which force hits against a car? | air resistance
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| Where does upthrust occur? | in water
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| Which force keeps us on the ground so we don’t float away? | gravity.
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| In which direction does gravitational force apply | downwards
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| 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.
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| Describe and explain what happens to air resistance as you move faster | air resistance increases as there are more particles to hit you
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| Why do dolphins have a streamlined shape | it enable them to move through water with the least possible water resistance.
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| 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
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| 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.
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| 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.
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| Explain the difference between mass and weight | Weight is the force that pulls you down; mass is the Number of atoms in the body
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| 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!
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| What is the force that keeps you afloat in water? | Upthrust
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| What can you do to make a car go faster? | Streamlining
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| Forces can make things change shape, speed or direction true or false | True
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| When are forces balanced? | Forces are balanced when they are equal in SIZE but opposite in DIRECTION: the forces cancel each other out.
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| When are forces unbalanced? | Forces are unbalanced when two forces are opposite in DIRECTION and one has a bigger SIZE than the other
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| Which of either the moon or the earth has more gravity? | The Earth
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| fill in the blank: if the forces on an object are balanced and the object is ............., then it will remain stationary | answer is stationary
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| 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)
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| 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
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| 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
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| 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.
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| 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.
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| 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.
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| 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
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| 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
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| What are the 2 forces on a stationary car | Gravity, Push of the floor
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| Compare the SIZE of the 2 forces on a stationary car | Gravity and Push of the floor are the same SIZE
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