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UNIT 5: FORCES
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Balanced forces, weigh > upthrust:
sink
Balanced forces, weight= upthrust:
float
...is the ability of an object to float in a liquid.
Buoyancy
Archimedes, and Ancient Greek scientist, discovered...
upthrust
An object with a... mass and a... volume, has.. upthrust.
large, small, less
An object with a... mass and a... volume, has... upthrust.
small, big and a lot of.
The... and... of an object influence the amount of....
mass, volume and upthrust.
Upthrust...
is a force applied by water and air. It pushes objects in air and water up, It is an opposite force to gravity.
Weight...
is a force. It's mass x gravity. Weight is measured in newtons (N).
Mass...
is the amount of matter in an object. It's measured in kilograms (kg).
Big objects has a....pull towards their centre than...objects.The Earth has a....pull on the Moon that the Moon has on the Earth.
stronger, smaller, stronger.
Because of gravity...
we stay on the ground, every thing that goes up comes back down.
Gravity...
is a non-contact force that pulls towards the centre of objects. This force is only noticeable with very large objects.
Some poles of a magnet...
repel
Opposite poles of a magnet...
attract
Magnets create a....around them. We cannot see these forces but they....objects made of......
magnetic field, iron and steel.
Because of magnetism...
the boy can't push the magnets together, the nails move towards the magnet. the fridge magnet stays on the door.
Magnets have a force called....This can be a... force....... is a..... force because a magnet moves an object.......
Magnetism, push or pull, non-contact force, without touching it.
Unbalanced forces examples...
push and pull force speed up the wing, chocolate breaks, a push force stops the ball...
The two opposite forces applied to the table are not equal.
Unbalanced forces
The two forces applied to the table are opposite and equal.
Balanced forces
Push and pull forces are...This means they move objects without touching them.
non-contact force
The finger applies a force to the marble...
contact force
Push and pull forces are...This means one object or person moves another by touching it.
Contact forces
There are two types of forces...
contact and non-contact forces
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