Give the equation which links momentum, mass, and velocity.
Give the equation which links change in momentum, time, and force.
Describe the main safety features of a car.
In the required practical which investigates the effect of force on acceleration, state what is used to calculate acceleration.
Calculate the speed of a car in metres per second that travels 54.3 kilometres in 35.1 minutes. Give your answer to 3 significant figures.
Calculate the power needed to raise a 50 kg object 15 metres in the air, in 10 seconds.
Define moment.
When is an object in equilibrium?
Define pivot.
How is distance from the pivot measured?
Give the equation for moment.
Define moment.
When is an object in equilibrium?
Define pivot.
How is distance from the pivot measured?
Give the equation for moment.
1. Which of the following equations is incorrect?
2. State the units for moment.
3. If the barrel has a mass of 90 kg, what is the mass of the box?
4. When the supports are removed, which of the following will happen?
We do - Explain why the object in the image is not balanced.
Both bricks exert a _____________ force on the lever. The pivot causes the left-hand force to make the lever want to turn _________________, while the right-hand force makes the lever want to turn _________________.
The right-hand mass is _________________ the left-hand mass, so its weight is ______________.
However, the left-hand mass is ___________ as far from the pivot as the right-hand mass.
Because moment equals force times distance, the moment of the right-hand mass is ____________ than the moment of the left-hand mass, so the lever turns ________________________.
You do - Explain why the object in the image is balanced.
1. Calculate moment on a lever if a force of 77 newtons is applied 40 metres from the pivot.
2. Calculate moment on a lever if a force of 69 kilonewtons is applied 99 centimetres from the pivot.
3. Calculate the distance from the pivot a force is applied if the force is 66 newtons and the moment is 28 newton-metres.
4. Calculate the force on a turning object if the moment is 88 newton-metres and the force is applied 5 centimetres from the pivot.
1. Calculate moment on a lever if a force of 27 newtons is applied 28 metres from the pivot.
2. Calculate moment on a lever if a force of 29 newtons is applied 66 metres from the pivot.
3. Calculate moment on a lever if a force of 82 kilonewtons is applied 27 metres from the pivot.
4. Calculate moment on a lever if a force of 64 kilonewtons is applied 30 centimetres from the pivot.
5. Calculate moment on a lever if a force of 9 newtons is applied 15 millimetres from the pivot.
6. Calculate the distance from the pivot a force is applied if the force is 34 newtons and the moment is 26 newton-metres.
7. Calculate the distance from the pivot a force is applied if the force is 21 newtons and the moment is 15 newton-metres.
8. Calculate the distance from the pivot a force is applied if the force is 11 centinewtons and the moment is 27 newton-metres.
9. Calculate the distance from the pivot a force is applied if the force is 62 newtons and the moment is 82 newton-metres.
10. Calculate the force on a turning object if the moment is 47 newton-metres and the force is applied 95 metres from the pivot.
11. Calculate the force on a turning object if the moment is 25 newton-metres and the force is applied 67 centimetres from the pivot.
12. Calculate the force on a turning object if the moment is 10 newton-metres and the force is applied 14 kilometres from the pivot.
13. Calculate the force on a turning object if the moment is 70 newton-metres and the force is applied 19 millimetres from the pivot.
14. Calculate the force on a turning object if the moment is 87 newton-metres and the force is applied 56 metres from the pivot.
1. The units for moment are newtons.
2. Moment equals force times mass.
3. A pivot is a point about which an object rotates.
4. Distance equals moment divided by force.
5. Distance is measured perpendicular to the force, from the pivot to the force.