How gears can help us | Science | Quizalize & Oak National Academy

Starter quiz

What effect do simple machines have?

they make it harder to perform tasks

they make it easier to perform tasks ✓

some make it easier and some make it harder to perform tasks
Both of these simple machines are useful for lifting things. Match the name to the description.

lever

⇔

a rigid bar resting on a turning point called a pivot ✓

pulley

⇔

a grooved wheel with a rope threaded through it ✓
Which of these images show a lever ?

a cart wheel

a window blind

removing a lid using a screwdriver ✓

a see-saw ✓
What is the name of the point along a lever around which it turns?

'pivot' ✓
With this pulley, in which direction is the effort compared to the movement of the load?

same

opposite ✓

it depends how you use it
Which word is used to describe the force needed to move a load using a simple machine?

'effort' ✓

Gears are simple mechanisms or machines which are useful for ______ things.

lifting

lowering

turning ✓
What is the name of the rod that holds a gear in place?

load

pivot

stick

axle ✓

axis
What is the name for the bits which stick out on the edge of a cog?

ridges

wheels

teeth ✓

zig-zags
If you have two gears, in which direction does the second one turn compared to the first?

the same direction

the opposite direction ✓

it depends how you turn it
Gears can change the size of a force. They allow a smaller force to have a ______ effect.

'greater' ✓
Match the size of the gears to the size of the force.

small gear turning a larger gear

⇔

gear turns more slowly with a greater force. ✓

larger gear turning a smaller gear

⇔

gear turns more rapidly with less force. ✓

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Gears are simple mechanisms or machines which are useful for turning things.
Gears are wheels with teeth that slot together and turn on an axle.
Gears can change the direction of a force. When one gear is turned, the other gear turns in the opposite direction.
Gears of different sizes working together can be used to change the size of a force and reduce the effort required.
A smaller gear will turn rapidly with less force, whereas a larger gear will turn more slowly with a greater force.

Gears only exist in bicycles and cars.

Explicit teaching of what gears are and where they are found.

Gear - A gear is a simple machine which is useful for turning things.
Cogs - A cog is a toothed wheel, often used in gear systems.
Axle - An axle is a rod that goes through the centre of the wheel to help it move and stay in place.
Clockwise - To turn clockwise means to turn in the same direction as the hands of a clock move round.
Force - A force is a push or a pull. Forces can make objects move, slow down, change direction or change shape.