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chpt 5
chapter 5 notes
Question | Answer |
---|---|
What is wieght? | a measure of teh gravitional force exerted on an object; it's value can change with the location of the object of the universe |
What is Mass? | A measure of the amout of matter in an object |
What is friction? | A force that opposies motion between 2 surfaces that are in contact |
What surfaces help friction | The rougher the surfaces the greater the friction |
What is Kinetic friction? | Kinetic=moving, between 2 moving forces |
What is Static friction | When a force is applied to an objectbut doesn't 'cause the object to move, static= not moving |
What are some ways to apply friction? | Make surfaces rougher.Sand put on icy streets.increase force |
What is Gravity? | A force of attraction between objects that is due to thier masses |
What is Motion? | An object's change in position relative to a reference point |
What is Speed? | The distance traveled divided by teh time interval during which the motion occured |
What is Velocity? | The speed of an object in a certain direction |
What is Acceleration? | The rate at which velocity changes, an object accelerates if it's speed,direction,or both change |
What is a newton? | the SI unit for force |
What si the symbol for newton? | N |
What is net force? | The combonation of all of teh forces acting on an object |