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Chapter 5 terms AE

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 total distance/total time
Velocity The speed of an object in a particular direction
What can cause velocity to change ? (2 things) Speed Direction
Acceleration the rate at which velocity changes
Acceleration is how fast what changes ? Velocity
Acceleration Formula –final velocity starting velocity/time it takes to change velocity
Positive Acceleration & Examples When velocity increases, a plane taking off
Negative Acceleration & Examples When velocity decreases, a car stopping at a stop sign
Centripetal Acceleration & Example Circular motion, a windmill
Force push or pull
Newton (N) unit used 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 ? They cause a change in motion
Balanced Forces The net force is a zero so there is no movement
Friction a force that opposes motion between two surfaces that are touching
Sources of Friction Roughness of surfaces and force pushing surfaces together
Relationship between greater force & friction Rougher surfaces and greater force make more friction
Sliding Friction The force that causes objects to stop moving
Rolling Friction Less friction that sliding friction because there is less friction between the wheels and the floor
Fluid Friction The fluid is now between your feet and the floor so there is less friction
Ways to reduce friction lubricants lubricants are applied to substances to reduce friction between them
Ways to reduce friction sandpaper Rubbing sandpaper on an object makes to smoother
Ways to increase friction Putting sand on an icy road, textured batting gloves
Gravity the force if attraction between objects that is due to their masses.
Why must force be used to lift objects? Gravity pulls down on objects
What does the Law of Universal Gravitation state? (3 parts) All objects in the universe attract each other through gravitational force. The size of the force depends of the mass of the objects and the distance between them.
Created by: PhySciLewis1
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