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# 6th Science Cha 5

### Chapter 5 Science Test - Matter in Motion

TermDefinition
Motion When an object changes position over time relative to a reference point
Reference Point A moving or nonmoving object used to see a changing position (Ex. earths surface, trees, buildings
Speed The distance traveled divided by the time taken to travel that distance
How to determine speed Total distance / Total time
Velocity The speed of an object in a particular direction
Difference between speed and velocity? Direction (N, S, E, W)
Acceleration The rate at which velocity changes (speed, direction or both) over time
Difference between velocity and acceleration How fast the change (speed or direction) is
Force A push or a pull exerted on an object in order to change the motion of the object. Has both size and direction.
Net Force The combination of all of the forces acting on an object
How can net force (same direction) be determined? Add the forces
How can net force (opposite direction) be determined? Subtract the smaller force from the larger force
Balanced Force Net Force of 0 N, will not cause a change in the motion of a moving object. Does not cause a nonmoving object to start moving
Unbalanced Force Net Force not equal to 0 N. will product a change in motion. Necessary to cause a nonmoving object to start moving
Friction A force that opposes motion between two surfaces that are in contact
Kinetic Friction Friction between two moving objects (Applying brakes on a bike or write with a pencil)
Static Friction When a force is applied to an object but does not cause the object to move (ex box on a table)
How is friction harmful? Causes holes in your socks, top soil to blow away
How is friction helpful? Pencils to write on paper, keeps us from slipping and falling when we walk
Ways to reduce friction Use lubricants, switch from sliding to rolling kinetic friction, make surfaces smoother
Ways to increase friction Make surfaces rougher, increase the force pushing the surfaces together
Gravity A force of attraction between objects that is due to their masses
How can you over come gravity? You must apply forces
Law of Universal Gravitation: Part 1 Gravitational force increases as mass increases
Law of Universal Gravitation: Part 2 Gravitational force decreases as distance increases
Difference between mass and weight The mass of an object does not change
Weight A measure of the gravitational force exerts on an object (its value can change with the location of the object in the universe)
Mass A measure of the amount of matter in an object
Created by: RoperFive