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# Chap. 5 Motion

### Chapter 5 Vocabulary

Motion An object's change in position over time in relation to a reference point.
Most common reference point Earth
Speed Distance traveled by an object divided by how long it took to travel that distance
Speed Formula S(speed)=d(distance)/t(time)
SI Units for Speed m/s, km/hr , ft/s
Velocity Speed in a given direction
Combining Velocities Same direction: add to find resultant velocity Different direction: subtract to find resultant velocity
Acceleration Rate of change in velocity over time
Acceleration Formula Acceleration=Final Velocity-Initial Velocity/Time
Centripetal Acceleration Acceleration that occurs in a circle. Constantly accelerating because it is always changing direction.
Force A push or pull
Unit used to express force Newton(N)
Net Force Combination of all forces acting on an object
Balanced force Net force = zero. No movement
Unbalanced force Net force does not = zero. Produces a change in motion
Friction Force that opposes motion between to surfaces that are in contact
Effect of force on friction Friction depends on how much force is pushing the two surfaces together. Changing the weight will increase friction. Changing surface area will not.
Kinetic friction Friction between moving objects
Static friction Friction that keeps objects from moving when a balanced force is applied
Lubricants Substances that reduce friction between two surfaces (ex. wax, oil, grease)
Gravity Attractive force between two objects because of their masses
Law of universal gravitation Created by Sir Issac Newton. States that all objects in the universe attract each other through gravitational force. The size of the force depends on the objects' masses and how far apart they are.
Weight How much gravity is pulling on an object. Can change due to its location.
Created by: Soo123