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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.