Starter quiz
- What does rigid mean?
- Hard to lever
- Hard to bend ✓
- Hard to slide
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- A see-saw usually creates the following type of movement:
- Round and up
- Round and down
- Up and down ✓
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- What is a mechanism?
- A set of connected moving parts that make something happen. ✓
- A set of connected parts that do not move.
- A set of unconnected parts that do not move.
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- Which part of a wheelbarrow is the fulcrum?
- Handle
- Barrow
- Wheel ✓
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- Where on a see-saw do you usually see a fulcrum?
- On top and in the middle of the rigid bar.
- Under and in the middle of the rigid bar. ✓
- On top and on the end of the rigid bar.
- Under and on the end of the rigid bar.
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- Where would you find the fulcrum on a pair of scissors?
- Handle
- Middle ✓
- End of the blade
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Exit quiz
- On a lever, the fulcrum is ...
- the point where the lever is weakest.
- the point the lever pivots on. ✓
- the point where force is applied to the lever.
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- The force we use to make the lever work is called ...
- the load.
- the effort. ✓
- the fulcrum.
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- Which of these is a class two lever?
Wheelbarrow ✓
Tweezers
Scissors
- A reverse motion linkage uses ...
- one fixed pivot and one moving pivot.
- one fixed pivot and two moving pivots. ✓
- two fixed pivots and one moving pivot.
- two fixed pivots and two moving pivots.
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- Which of the following were used as pivots in the making activity?
- Card
- Split pins ✓
- Scissors
- Pencils
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- What is the movement that affects the output of a mechanism?
- 'The input' ✓
Worksheet
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Presentation
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Video
Lesson Details
Key learning points
- Levers are rigid bars that create movement by turning on a pivot point.
- Linkages are systems that create movement using one or more levers.
- Reverse motion linkages use a fixed pivot to change the direction of input so that the output goes the opposite way.
- Making a reverse motion linkage can help with understanding its features and movement.
Common misconception
Levers are always used to make things move easier.
Some levers are designed to to move things faster or further, a pair of tweezers for example.
Keywords
Mechanism - a set of moving parts that make something happen
Lever - a mechanism which creates movement
Pivot point - a point around which an object moves or rotates
Linkage - a mechanism connecting levers together
Reverse motion linkage - a linkage that creates movement in opposite directions
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