definitions of motion
calculation fun
pot pourri
graphs of velocity and acceleration
Labs/quizzes
100
the study of motion of objects
What is Mechanics
100
If sam throws a baseball to his friend standing 20 meters away. The baseball's speed is 12 m/s. How long does it take the ball to reach the friend?
1) draw the triangle 2) s = d/t so time = d/s 3) 20/12 = 1.6 s
100
Examples of units of acceleration
What is m/s2 meters per second per second • km/h2 kilometers per hour per hour
100
The slope of the line in a position vs time graph will tell you the__________
What is the velocity or speed of the object
100
How do you calculate slope?
What is (Slope=rise/run) (Y2-Y1)/(X2-X1)
200
The science of describing motion
What is kinematics
200
I walk 10 meters north and then 5 meters east. What is my displacement? Full correct answer only receives credit
What is √125 = 11.18 or meters NE
200
the rate at which velocity changes
What is Acceleration
200
A horizontal straight line at 2 m/s on a velocity vs time graph means __________ acceleration
zero (0)
200
Draw this position vs time graph: I am walking TO the detector. I start out slowly and then my speed increases.
Curved line starting high in the y-axis with a small slope and as it travels towards the x-axis, the slope increases.
300
A quantity, such as mass, length, or speed, that is completely described by its magnitude and has no direction
What is a scalar
300
How long would my trip take if I travel 225 km at a speed of 95 km/hr
What is 2.37 hours
300
describes both speed and direction
What is Velocity
300
coordinates on a graph of velocity vs time (5,10) (16, 32) My acceleration is
32-10 = 22 16-5 = 11 2 m/s2
300
find the velocity of this line given the coordinates (0, 7) and (6,25) on a position vs time graph
25 -7 = 18 (Y) and 6-0 = 6 (X) Y/X = 3 m/s
400
A quantity, such as mass, length, or speed, that is completely specified by its magnitude and has direction
What is vector
400
A car drive 50 km north then turns around and drives 40 km south. Its displacement is_____________
1) 50 - 40 = 10 2) draw picture and the straight-line distance from start to stop = 10 km north
400
I dropped an object from a very tall building. The object is in free-fall. After 15 seconds, its change in velocity is __________?
1) formula is delta v = g x t 2) 9.8 x 15 = 147 m/s
400
graph on postion vs time of constant increasing speed followed by stopping for 5 seconds
45 degree line followed by a flat line imgscr="
400
draw a constant acceleration (increasing) graph on a velocity (y-axis) vs time (x-axis) labels
straight line at a 45 degree slope
500
Motion describing an object that covers the same distance every regular interval of time
What is constant speed
500
A bicycle is heading East traveling 5000 meters. It turns around and travels west 1000 meters. The total journey time is in 5 minutes. Its velocity in m/s is ___?
1) must change minutes to seconds 5 X 60 =300 sec 2) 5000 - 1000 = 4000 meters 3) 4000/300 = 13.3 m/s E
500
An moving object moves from 10 m/s to 65 m/s in 6 seconds. What is its final velocity after 11 seconds if the acceleration rate continues? Hint: 2 step problem
1) calculate acceleration 65 - 10 / 6 = 9.17 m/s/s 2) vf = (at) + vi ==> (9.17 x 11) + 10 =110.8 m/s
500
Graph of position vs time of velocity that is fast to slow moving to the motion detector
curved steep line flattening out heading from y to x
500
My speed challenge lab had me hopping 10m in 4.5 seconds. Based on this speed, how long would it take me to hop 30 m?
1) Find speed s = d/t so 10/4.5 = 2.22 m/s 2) Use new equation s=d/t Use 2.22 m/s for speed and 30 m for distance 3) 30/2.22 = 13.51 sec
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