Linear Motion

you can be at rest relative to Earth, but moving about 107,00 km/h relative to the sun
how can you be both at rest and also moving about 107,00o km/h at the same time
yes
speed = d/t
you cover 10 meters in a time of 1 second. is your speed the same if you cover 20 meters in 2 seconds
instantaneous speed
does the speedometer of a car read instantaneous speed or average speed

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distance covered = average speed x travel time
average speed= distance covered / travel time. do some algebra and multiply both sides ot this relation by travel time. what does the result say about distance covered
velocity – has both magnitude and direction
speed only has magnitude
what is a vector quantity, speed or velocity? defend your answer
accelerator and brake
steering wheel
what two controls on a car cause a change in speed? what control causes only a change in velocity?
10 km/h/s
what is the acceleration of a car moving along a straight path that increases its speed from zero to 100 km/h in 10 s
2 km/h
4 km/h
10 km/h
by how much does the speed of a vehicle moving in a straight line change each second when t is accelerating at 2 km/h/s? at 4 km/h/s? at 10 km/h/s?
once for speed change and another for time change
why does the unit of time enter twice in the unit of acceleration
fall is free of air drag and forces other than gravity
what is the meaning of free fall
50 m/s
60 m/s
(g=10)
for a freely falling object dropped from rest what is the instantaneous speed at the end of the fifth second of fall?
10 at all time
how far will a freely falling fall from rest in five seconds? six seconds?
125 m
180 m
how far will an object move in one second if its average speed is 5 m/s?
5 m
how far will a freely falling object have fallen from a position of rest when its instantaneous speed is 10 m/s?
5 m
what does the slope of the curve on a distance-versus-time graph represent
speed
what does the slope of the curve on a velocity-versus-time graph represent
acceleration
does air resistance increase or decreases the acceleration of a falling object
decrease
what is the appropriate equation for how fast an object freely falls from a position of rest? for how far that object falls
v=gt
d= 1/2gt^2
for a freely falling object dropped at rest, what is the acceleration at the end of the fifth second of fall? the sixth second? at the end of any elapsed time t?

David
Tucker

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