Starter quiz
- Which of these is not the result of there being a resultant force acting on an object?
- A stationary object starts to move.
- The shape of an object changes.
- A stationary object remains stationary. ✓
- A moving object changes direction.
- A moving object speeds up or slows down.
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- Which of these objects do not make use of levers?
- see-saw
- screwdriver
- door
- hose pipe ✓
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- What name is given to the force that is applied to make a lever move?
- effort ✓
- load
- pulling force
- pushing force
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- What name is given to the force that is exerted by a lever?
- effort
- pushing force
- pivot
- load ✓
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- Levers are often used as force __________ as they produce larger load forces than the effort force used to move them.
- multipliers ✓
- expanders
- boosters
- accelerators
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- Which of these units can the size of the load force be measured in?
- grams
- newtons ✓
- kilograms
- kilonewtons ✓
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Exit quiz
- Match the keywords and phrases to the explanations.
- newton-metre (Nm)⇔a unit for the turning effect of a force for large distances ✓
- newton-centimetre (Ncm)⇔a unit for the turning effect of a force for small distances ✓
- moment⇔the size of the turning effect of a force ✓
Which of these describes the conditions needed for two people to balance on a seesaw?- The weight of the people on each side must be the same.
- The distance from the people to the pivot on each side must be the same.
- The distances to the pivot multiplied by the weights must be the same. ✓
- The total weight must add up to zero.
- They must be on the same side of the seesaw.
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Six masses are hung 5 cm from the left on this balance beam. Where on the right side should the three masses be hung to make the beam balance?- 1 cm
- 4 cm
- 5 cm
- 8 cm
- 10 cm ✓
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- A 4 N weight is placed 0.5 m from a pivot on a balance beam. Where should an 8 N weight be placed to balance the beam?
- 0.5 m on the opposite side of the pivot
- 1.0 m on the opposite side of the pivot
- 0.25 m on the opposite side of the pivot ✓
- 0.25 m on the same side of the pivot
- 0.5 m on the same side of the pivot
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- Starting with the largest, put the following forces and distances from a pivot into order of decreasing size of the moment they will cause.
- 1⇔distance = 1 m, force = 5 N
- 2⇔distance = 1 m, force = 4 N
- 3⇔distance = 50 cm, force = 2 N
- 4⇔distance = 20 cm, force = 3 N
- 5⇔distance = 25 cm, force = 2 N
A pupil tests different combinations of force and distance on opposite sides of a balance beam. Which rows show combinations that will balance the beam?- A
- B
- C ✓
- D
- E ✓
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Worksheet
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Presentation
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Video
Lesson Details
Key learning points
- A moment causes turning.
- Moment = force × (perpendicular) distance from the pivot.
- Moments are measured in Newton-metres (Nm).
Common misconception
The turning effect is a force (it is often wrongly called a turning force).
Correct any use of the erroneous term ‘turning force’ and use examples of the turning effect caused by force with a lever.
Keywords
Balanced - A beam is balanced if it is not starting to rotate about its pivot.
Newton-metre - One unit for the turning effect of a force is the newton-metre (N m).
Newton-centimetre - Another unit for the turning effect of a force is the newton-centimetre (N cm).
Moment - The turning effect of a force is called a moment.
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