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Friction
Question | Answer |
---|---|
definition of friction | A force that opposes motion between 2 surfaces that are touching |
What are two factors that determine the amount of friction? | the force pushing the surfaces together and the roughness of the surface. |
what is acceleration? | rate of velocity change over time |
Give examples of balanced forces | Sitting still on a still chair. |
Give examples of unbanlenced foces | bouncing a ball |
what is a way to increase friction ? | adding salt and sand to icy roads |
What is a way to reduce friction ? | use ice blades to skate so it melts a thin layer of water |
give an example of how friction can be helpful | wheels on a lawn mower make it easier to push the mower |
give an example of how friction can be harmful | friction between engine parts wears out the engine |
what are 2 things do you have to know how to calculate speed? | distance/time |
what are the 2 kinds of frictions? | static, and kinetic |
What is kinetic friction? | is moving friction |
What is the 2 kinds of kinetic friction? | rolling, and sliding |
what is static friction? | is a still friction |