Chapter 11Motion

Frame of reference______________________________________, a

frame of reference is needed.

11.1 Distance and Displacement

Relative Motion –_______________________________

________________________________________________

DistanceThe length of a path between two points.Measured with the ________.

Displacement_________________________________________________________________________________________________________________________– a quantity that as

magnitude and direction. The magnitude can be size, length, or amount.

Add displacements using vectors.

Displacement along a straight line.

Displacement that isn’t along a straight path

Displacement that isn’t along a straight path

Resultant vector – _________

______________________________________________________

Red line

11.2 Speed and Velocity

Speed______________________________________________________________________________________________Measured in ____________

Ex: Speed of your car

________________– computed for the entire duration of the trip.

Instantaneous speed – __________________________

________________________________________________Your car’s speedometer.

Graphing Motion

________________________to describe motion.Slope of a line on a distance-time graph is speed.

Car not at constant motion.Slope of straight portions = periods of constant speed.

VelocityA description of both

___________________________________________________________________________Velocity is a vector.

Combining VelocitiesTwo or more velocities add by vector

______________.

11.3 Acceleration

Acceleration______________________________________________Changes in speed, changes in direction, or

changes in both.

Changes in SpeedAcceleration –

_________________________________________________________– car traveling at

constant speedNo longer pushed into seat.

_______________________– acceleration that slows an object’s speed.Car coming to stoplight – pulled away from

seat.

__________________________The movement of an object toward Earth solely

because of gravity.Objects falling near the Earth’s surface

accelerate downward at a rate of _______________________

Changes in DirectionYou can accelerate even if your

___________________Riding a bicycle around a curve.Your change in direction means you are

accelerating.

Changes in Speed and DirectionExample – roller coaster ride

Car on windy road.

Roller coaster physics clip.

Constant Acceleration______________________________________________Airplane’s acceleration at takeoff.

Calculating Acceleration

You can calculate acceleration for straight-line motion by dividing the change in velocity by the total time.

Graphing AccelerationSpeed-time graphs -

_____________________________________________________________________________

Distance-time graph – ___________________________

________________________________________________Curve connects the data points that are

plotted.

Instantaneous Acceleration______________________________________________

_________________________________________________

Skateboarder on a half-pipe. At every moment she has an instantaneous acceleration, even if she is standing still and the acceleration vector is zero.