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Description
Flashcards by Amelie Mataskova, updated more than 1 year ago
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Created by Amelie Mataskova
over 10 years ago
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| Question | Answer |
| What can forces do? | Make a still object move Make an object speed up Make an object slow down Make an object stop Make an object change direction Make an object change shape |
| Friction is ... | A contact force which occurs between two moving objects. When we rub our hands together there is friction. Friction makes heat or noise. It can be a help or a hindrance. We can reduce friction by using lubricants like oil or grease. This is Lubrication. |
| Formula for density is ... | |
| Density of water is ... | 1g/cm cubed |
| What are balanced and unbalanced forces? | We say a force is balanced when there is no overall force acting on it. |
| What is the formula for speed? | |
| What is the stopping distance made up of? | The thinking distance and the braking distance. |
| What is the thinking distance? | The time in-between the driver seeing an obstacle and hitting the brakes. |
| What is the braking distance? | The time in-between hitting the brakes and coming to a halt. |
| Describe when the object goes slowly, goes quickly and stops. | The object goes quickly from A-B. Stops from B-C. Goes slowly from C-D. |
| What does gravity do? | It pulls you down. |
| Where does gravity differ? | In the size of planets. The smaller, the less gravity. |
| What unit are forces measured in? | Newtons (N) |
| How are they measure in a classroom? | With a Forcemeter |
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