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JA 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 equals 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 – final velocity minus starting velocity/time it takes to change velocity
Positive Acceleration & Examples – velocity increases: plane taking off
Negative Acceleration & Examples – velocity decreases: skating
Centripetal Acceleration & Example the acceleration toward the center that holds a satellite in elliptical orbit: the Earth and the Moon
Force a push or pull
Newton (N) – unit to express force
Net Force – the force that results from combining all the forces exerted on an object
Why are unbalanced forces necessary to cause movement? It produces movement
Balanced Forces when the forces applied to an object produce a net force of zero
Friction The resistance that one surface or object encounters when moving over another
Sources of Friction the roughness of any object
Relationship between greater force & friction the amount of friction depends on the force pushing the surfaces together
Sliding Friction moving for a short distance then stopping
Rolling Friction the friction between a rolling object and the surface
Fluid Friction when a liquid reduces friction
Ways to reduce friction – lubricants
Ways to reduce friction – sandpaper
Ways to increase friction make surfaces rougher
Gravity – a force of attraction between objects that is due to their masses
Why must force be used to lift objects? the earth pulls everything to its center therefore force must be used to lift an object
What does the Law of Universal Gravitation state? (3 parts)
Created by: PhySciLewis1
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