Chapter 10 Measuring Motion Flashcards
Motion
an object’s change in position relative to a reference point.
Reference Point
A basis or standard for comparison of an objects motion
Displacement
the change in the position of an object.
Speed
the distance traveled divided by the time interval during which the motion occurred. Speed describes how fast an object moves.
Average Speed
The average Speed of all the time with a certain distance, calculated as distance divided by time.
Instantaneous Speed
The speed at a given point in time.
Velocity
the speed of an object in a particular direction.
Resultant Velocity
Combination of velocities in an equation
Acceleration
The rate at which velocity changes over time.
Centripetal Acceleration
The rate of change of tangential velocity
Constant Acceleration
Change in velocity that doesn’t vary over a given length of time
Force
An action exerted on a body in order to change the body’s state of rest or motion; force has magnitude and direction
Net Force
The combination of all the forces acting on an object
Balanced Forces
Do not cause an object at rest to start moving. They do not cause a change in motion of a moving object either
Friction
A force that opposes motion between two surfaces that are in contact
Sliding Friction
The friction that occurs when objects slide past each other
Rolling Friction
The friction that occurs when a round object rolls over a flat surface. Less than sliding surface
Fluid Surface
The friction that occurs when any object moving through a fluid. Such as air encounters friction between the air and the surface of a moving object
Static Friction
The force that resists the initiation of sliding motion between two surfaces that are in contact and at rest
Kinetic Friction
The force that opposes the movement of two surfaces that are in contact and are sliding over each other
