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' ✓
Exit quiz
- 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. ✓
Worksheet
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Presentation
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Lesson Details
Key learning points
- 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.
Common misconception
Gears only exist in bicycles and cars.
Explicit teaching of what gears are and where they are found.
Keywords
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.
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