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Science ch 2
lesson 2
Question | Answer |
---|---|
What factors affect friction? | the types of surfaces involved, and how hard the surfaces are pushed together |
What is Friction? | force that two surfaces exert on each other when thy rub against each other |
What is Sliding Friction? | occurs when two solid surfaces slide over each other, makes object slow down |
What is Static Friction? | acts between objects that aren't moving |
What is Fluid Friction? | occurs when a solid object moves through a fluid or gas |
What is Rolling Friction? | object rolls across a surface |
What is an example of Sliding Friction? | fireman down a pole |
What is an example of Static Friction? | couch on a carpet |
What is an example of Fluid Friction? | animal in water or mid air |
What is an example of Rolling Friction? | a bike's wheel down a road |
What factors affect gravity? | mass and distance |
What is Gravity? | the force that pulls objects toward eachother |
What is the Law of Universal Gravitation? | that the force of gravity acts between all objects in the universe that have mass |
What is mass? | measure of the amount of matter in an object |
What is the SI unit of mass? | kilogram |
What is weight? | measure of force of gravity on an object |