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force and work
| Question | Answer |
|---|---|
| name 5 types of forces (there are many) | pulling, pushing, weight, friction, tensing, stretching, compression, electric and magnetic forces. |
| what is a force | something that causes an object to accelerate or change velocity |
| what is force measured in? | Newtons (N) |
| what are the main effects of forces | speed, direction, shape or size of objects. |
| how can forces be measured | with a spring balance or newton-meter |
| what effect does gravity have | downward pull on objects. |
| can weight vary on different parts of the earth | yes |
| what is 1 N equal to in kg's | 10Kg |
| what is friction | a force which always tries to resist movement between any two surfaces in contact. |
| what is the name of something if it returns back to its original shape when streched | elastic |
| what is Hooke's law | the extension of a spring directly proportional to the force streching it |
| what kind of a graph is directly proportional | straight line graph |
| what is work | when a force moves an object |
| how do you find the mount of work done | force x distance moved |
| what is energy | the ability to do work |
| how is work & energy measured | Joules (J) |
| what is power measured in? | watts (W) |