Physics of Motion. Physics of Motion. Frame of Reference- background or object that shows a change in position. Ex. Earth or the Horizon Fixed in place. If an object is moved from here we have had some kind of motion. What is the difference between speed and acceleration?
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Frame of Reference- background or object that shows a change in position.
Ex. Earth or the Horizon
Fixed in place. If an object is moved from here we have had some kind of motion.
Can a car be speeding very fast and have zero acceleration?
S = D/ T
cm/sec, light years/century etc.
average speed = total distance/time
S = distance/time = D/T =
480 km/ 6.0 h = 80. km/h (note that it’s two significant figures)
S x T
When solving problems, always write the symbolic equation first
When solving problems, always write the symbolic equation first. Then an equal sign, then put in the known numbers, then solve.
How long does it take for the Metroliner train to go from NY to Boston, which are 520 km apart, if it averages 127 km/hr?
Courtesy of CobraCountry.com
t = Vf-Vi/a
Vf = (a x t) + Vi
Vi = Vf – (a x t)
UNITS MUST MATCH!
Answer: 5 km/h/s
Courtesy Dan Heller Photography
Gravity takes speed away on the way up at 9.8 m/s/s and then gives it back on the way down, at the same rate
5 m/s, average of 0 and 10
5m = 5 m/s x 1s
15 m/s, average of 10 and 20
15m = 15m/s x 1s
20m = 5m + 15m
d = 1/2gt2
Now if the object is in motion, then you have to account for that as well.
d= vit + 1/2gt2
A person is standing on top of a roof, holding two objects. The person drops item A and at the same time throws item b straight up over the edge of the building with an initial speed of 25 m/s. If the building itself is 450 m high, how long will it take both objects to hit the ground and at what speed will they hit the ground with?
1. A Helicopter is rising 5.0 m/s and someone drops a bag from it. After two seconds, what is the bags velocity, how far has the bag fallen and how far below the helicopter is the bag?
2. The helicopter in problem one now descends 5.0 m/s. After two seconds, what is the bags velocity, how far has the bag fallen and how far below the helicopter is the bag?
A weather balloon is floating upward at 2.5 m/s above the Earth when it releases a pack of instruments.
A. If the pack hits the ground with a velocity of 73.5 m/s how far did the pack fall?
B. How long did it take for the pack to fall?