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Nick Curtis 55 terms

QuestionAnswer
Motion When an object changes position over time when compared with a reference point
Speed The rate at which an object moves
Average Speed Formula Average speed= Total distance/total time
Velocity The speed of an object in a particular direction
What can cause velocity to change? (2 things) Speed or direction
Acceleration The rate at which velocity changes
Acceleration is how fast what changes? Velocity
Acceleration Formula Acceleration=5m/s
Positive Acceleration & Examples acceleration at witch velocity increases Ex: a plane taking off, a race car starting a race, a hoarse at a race
Negative Acceleration & Examples acceleration at which velocity decreases Ex: A car stopping at a stop sign, a plane landing, a bus stopping at a stop
Centripetal Acceleration & Example Acceleration that always occurs in a circular motion ex: wind mill
Force a push or pull
Newton (N) the units used to express force
Net Force The force that occurs from combining all forces exert on an object
Why are unbalanced forces necessary to cause movement? They create changes in movement
Balanced Forces Create no change in motion
Friction a force that opposes motion between two surfaces that are touching
Sources of Friction – when any object is rough
Relationship between greater force & friction They create more friction
Sliding Friction – When something is slid on another object
Rolling Friction When something uses wheels to roll across another object
Fluid Friction When fluids make an object have less friction
Ways to reduce friction – lubricants –substances that are applied to objects to stop friction
Ways to reduce friction – sandpaper – An object use to create friction
Ways to increase friction – Make the object rougher and use more force
Section 4
Gravity a force between two objects that is due to their masses
Why must force be used to lift objects? Because gravity is pulling it down
What does the Law of Universal Gravitation state? (3 parts) All objects in the universe attract each other by gravitational pull,
Created by: PhySciLewis1
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