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Ch 5 terms

ch 5 terms

QuestionAnswer
Motion When an object changes position over time when compared to a reference point the object is in
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 or direction can both change this.
Acceleration The rate at which velocity changes.
Acceleration is how fast what changes ? velocity is how fast what changes?
Acceleration Formula m/s- m/s divided by s
Positive Acceleration & Examples When velocity increases. Riding your bike faster after each second.
Negative Acceleration & Examples When velocity decreases. The skating example.
Centripetal Acceleration & Example The acceleration that occurs in circular motion.
Force a push or pull
Newton (N) a unit expressing force.
Net Force the force that results from combining all the forces on an object.
Why are unbalanced forces necessary to cause movement ? so they don’t cancel each other out.
Balanced Forces the forces applied to an object equal a net force of 0.
Friction a force that opposes motion between two surfaces that are touching.
Sources of Friction
Relationship between greater force & friction creates more friction because the hills and valleys can come into closer contact.
Sliding Friction If you push an eraser across your desk the eraser will slide for a minute and then come to a stop.
Rolling Friction The friction between the wheels and the floor is an example of rolling friction.
Fluid Friction opposes the motion of objects traveling through a fluid.
Ways to reduce friction – lubricants substances that are applied to surfaces to reduce the friction between them.
Ways to reduce friction – sandpaper rub this against a surface to make it smoother and reduce the amount of friction.
Ways to increase friction make surfaces rougher to do this.
Gravity a force of attraction between objects that is due to their masses.
Why must force be used to lift objects? because gravity is pushing the force back down to earth.
What does the Law of Universal Gravitation state? (3 parts) part 1: Gravitational force is small between objects with small masses. Part 2: Gravitational force is larger between objects with larger masses. Part 3: If the distance between two objects is increased, the gravitational force pulling them together is re
Created by: AD12398
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