meh Flashcards
(21 cards)
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
if you drop a feather at the same time in a stube filled with air, which will reach the bottom of the tube first?
the coin
acceleration is defined as the change in
velocity divided by the time interval
the graph above describes the motion of a ball. at what point is the velocity of the ball equal to its velocity at b?
none
the graph above describes the motion of a ball. at what point is the speed of the ball equal to its speed at b?
d
what is the SI unit of acceleration?
m/s^2
what is the speed of an object at rest?
0.0m/s
