12984858
Description
Flashcards by Ellie James, updated more than 1 year ago
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Created by Ellie James
about 6 years ago
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| Question | Answer |
| What is a scalar quantity? | A quantity that only has a magnitude or size |
| Give 3 examples of scalar quantities | Density, speed, mass , temperature, distance, energy |
| What is a vector quantity? | A quantity that has both magnitude and an associated direction |
| Give 3 examples of vector quantities | Displacement, force, weight, velocity, acceleration, momentum |
| How do you work out speed? | Distance/ time |
| How do you work out acceleration? | Change in velocity/ time taken |
| When will an object accelerate? | When a resultant force acts on it |
| What keeps the planet in orbit around the Sun? | Gravitational attraction provides a centripetal force that keeps planets in orbit |
| What is Newtons first law of motion? | An object stays in the same state of motion unless a resultant force acts on it |
| What happens if the forces acting on an object are balanced? | The resultant force will be zero |
| What is Newtons second law of motion? | Resultant force = mass x acceleration |
| What is inertial mass? | A measure of how difficult it is to change the velocity of an object |
| What is Newtons third law of motion? | Every reaction has an equal or opposite reaction |
| How do you work out weight? | Mass x gravitational field strength |
| How do you work out force? | Change in momentum/ time taken |
| How do you work out momentum? | Mass x velocity |
| Work done is the same as... | Kinetic energy |
| How do you work out kinetic energy? | 0.5 x mass x (velocity)squared |
| How do you work out stopping distance? | Thinking distance + breaking distance |
| What happens when a car breaks? | There is work done by the friction between the wheels and the breaks which reduces the kinetic energy of the vehicle |
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