meh Flashcards
suppose you are given a position versus time graph. the slope of this graph describes what quantity?
velocity
suppose you are in a car that is going around a curve. the speedometer reads a constant 30 miles per hour. which of the following is not true?
your velocity is constant
when a car’s velocity is negative and its acceleration is negative, what is happening to the car’s motion?
the car speeds up
which of the following line segments on a position versus time graph is physically impossible?
a vertical line
speed is
all of the above
a ball is thrown upwards and caught when it comes back down. In the absence of air resistance, the speed of the ball when caught would be:
the same as the speed it had when thrown upwards
when you look at the speedometer in a moving car, you can see the car’s:
instantaneous speed
a ball is thrown straight up. at the top of it’s path it’s acceleration is:
-9.8m/s^2
which of the following situations represents a negative displacement?
a cat jumps from a tree limb to the ground
in the graph above, a toy car rolls from +3 m to +5 m. which of the following statements is true?
x(i)=+3m
if you know the acceleration of a car, its initial velocity, and the time interval, which of the following can you predict?
all of the above
acceleration due to gravity is also called:
free-fall acceleration
suppose an object is in free fall. each second the object falls:
a larger distance than the second before
when a car’s velocity is positive and its acceleration is negative, what is happening to the car’s motion?
the car slows down
poop question
44.1
