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Chapter5TermsJD

Josh Drexler

QuestionAnswer
Motion when an object changes position over time when compared with a reference point.
Speed The rate at which the object travels.
Average Speed Formula Average speed 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 the velocity changes.
Acceleration is how fast what changes ? velocity
Acceleration Formula acceleration equals final velocity – starting velocity/time it take to change velocity
Positive Acceleration & Examples When the velocity is increased. A plane taking off
Negative Acceleration & Examples When the velocity is decreased. A car stopping.
Centripetal Acceleration & Example The acceleration that occurs in circular motion
Force A push or pull.
Newton (N) How scientists 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 ? Because they make a change in motion.
Balanced Forces when an objects net force is at 0
Friction A force that opposes motion between two surfaces that are touching.
Sources of Friction When the surface of any object is rough.
Relationship between greater force & friction The amount of friction depends on the force pushing the surfaces together. The stronger the force the greater the friction
Sliding Friction The force is large.
Rolling Friction The force is smaller and easier to overcome.
Fluid Friction The force is less than sliding friction.
Ways to reduce friction lubricants
Ways to increase friction sandpaper
Gravity A force of attraction between objects that is due to their masses.
Why must force be used to lift objects? Because all objects have gravity and you must do it to overcome the gravitational pull.
What does the Law of Universal Gravitation state? (3 parts) Gravitational pull is small between objects with smaller masses. Gravitational force is larger between objects with larger masses. If the space between the 2 objects is increased then the gravitational force pulling them together is reduced.
Created by: PhySciLewis1
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