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9K speeding up
9K speeding up AJHS nz
Question | Answer |
---|---|
mean speed | The total distance something travels divided by the total time taken allows you to calculate the thing’s mean or average speed. |
speed | How fast something is moving. Often measured in metres per second (m/s), miles per hour (mph) or kilometres per hour (km/h). |
accelerate | Change speed. |
air resistance | A force that tries to slow down things that are moving through the air. It is a type of friction. |
balanced forces | When two forces are the same strength, but working in opposite directions. |
friction | A force that tries to slow things down when two things rub against each other. |
unbalanced forces | When two forces working in opposite directions are not the same strength. |
drag | Another name for air resistance or water resistance. |
streamlined | Giving something a smooth shape to reduce the air resistance or water resistance. |
water resistance | A force that tries to slow down things that are moving through water. It is a type of friction. |
distance–time graph | A graph that shows how far something has moved in a certain time. |
terminal velocity | The maximum speed of an object. Usually only applies to falling objects when the downward force is balanced by drag. |