KS3 Speed Pressure and Moments
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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| What unit is used for the moments | the unit is N.m (N x m)
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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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| Why would you stay the same speed in a moving car? | because the forces on you are balanced.
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| Describe a force. | A force is push, pull or twist.
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| What force keeps us on the earth? | Answer: Gravity
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| How would you measure a force? | Answer: With Newtons
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| How do you work out Moments | Answer: Mass x distance to pivot
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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? | Answer: The weight
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| In a tug of war, when one team is pulling with a force of 100 N to the leftand the other 80 N to the right, what is the net force? | Answer: 20N to the left
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| What is the force that keeps you afloat in water? | Answer: Upthrust
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| Which of these will help a car go faster? | Answer: Streamlining
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| What is the equation to work out the pressure? | force divided by area
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| What is the equation to work out the area? | force divided by pressure
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| What is the equation to work out the force? | pressure times the area
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| What unit measures force? | newtons
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| What is the equation to work out the distance? | speed times the time
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| What is the equation to work out the time? | distance divided by speed
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| What is the equation to work out the speed? | distance divided by time
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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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| What is a force ? | a force is a push or pull movement
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| Name three types of forces? | gravity, up thrust and air resistance
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| Is gravity a push or pull force? | pull
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| Is up thrust a push or pull force? | push
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| Is air resistance a push or pull force? | push
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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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| Where does upthrust occur? | in water
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| When you drive in a car which force hits against a car? | air resistance
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| Which force keeps us on the ground so we don’t float away? | gravity.
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| Forces can make things change shape, speed or direction true or false | True
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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 which direction does gravitational force apply | downwards
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| Suggest what would happen to the weight of an astronaut who travelled to space | the weight will be the different because only the mass does not change but when you’re in space your weight changes it becomes lighter.
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| 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 after the parachute is open for 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 sheley Rudman won her gold medal in the bobsleigh skeleton suggest one thing she have done to make sure she went fast as possible | by making smaller surface area
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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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| what does weight mean? | pull of gravity
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| list 2 common units you can measure speed? | mph,km
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| fill in the blank |
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| if the forces on an object are balanced and the object is .............it will remain stationary | answer is stationary
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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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| what is friction? | friction is a force that slows you down, created when one object rubs against another!
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| What type of line of a distance graph shows that the moving object has stopped? | A straight horizontal line
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| What is a stationary object? | An object that isn’t moving
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| Complete the sentence “The smaller the surface area, the more ...” | Pressure
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| Air Resistance is created out of ... | Particles hitting the moving object
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| How do you work out the moment? | mass x distance
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| Which of either the moon or the earth has more gravity? | The Earth
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| True or false; Your body would float in water? | True
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| How do you work our pressure? | force over area
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| How do you work out the area? | Force over pressure
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| How do you work out the force? | pressure times area
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| Complete the sentence “Air resistance ... the car down.” | slows
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| Complete the sentence “The more ... the more pressure” | force
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| Define up thrust | up thrust is the upward force that 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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| 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 one has a bigger force than the other
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| What would an accelerating object look like on a speed time graph? | Sloping upwards.
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| Which direction does air resistance go? | Opposite to the movement.
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| How will a see-saw balance? | When the distance x weight on both sides is the same.
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| On the can experiment, why did the can collapse? | Because of there was more pressure on the outside of the can than there was pressure inside the can
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| On a distance vs time graph, what does a straight line mean? | The object is going at the same speed
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| On a distance vs time graph, what does a flat line mean? | The object is not moving
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| What does BLAST stand for? | Best fit Label Axis Scale Title
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| If a slope on a line graph is steeper in the second part of a journey, what does it mean? | The object is moving faster in the second part of the journey
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| If the force on a submarine porthole at a depth of 10m is 5000n, and the area of the porthole is 100m squared. What is the pressure? | pressure=force/area= 5000N divided 100m squared =50N/m squared
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| Explain why have camels big feet? | so they don’t sink into soft sand because they have a large area so the pressure is large.
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| If a box weighs 100N. it exerts a pressure of 25 N/m2 on a table. What is the area of the box in contact with the table | area=force/pressure=4m2
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