Physics unit 3

A ball is thrown straight up. At the top of its path its acceleration is

-9.8 m/s^2

According to the graph above, during which interval does the cat have the greatest positive velocity

0.0-5.0

According to the graph above, the cat has the fastest speed during which interval?

10.0-15.0

Acceleration due to gravity is also called

free-fall acceleration

The graph above describes the motion of a cyclist. The graph illustrates that the acceleration of the cyclist

is constant

What is the SI unit of acceleration?

m/s/s

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

Suppose you are given a position versus time graph. The slope of this graph describes what quantity

velocity

Acceleration is defined as the CHANGE in

velocity divided by the time interval

In the graph above, a toy car rolls from +3 m to +5 m. Which of the following statements is true?

xi=+3m

Zander is walking in the quad minding his own business when all of a sudden he feels something hit his head. Chase starts to laugh and tells Zander that a bird just pooped on him. Chase noticed that the poop fell for 3 seconds. How high above the ground was the bird when he made the decision to bomb Zander.

44.1 m

According to the graph above, during which interval is the

5.0-10.0 s

Which of the following situations represents a negative displacement? (Assume positive position is measured vertically upward along a y-axis.)

A cat jumps from a tree limb to the ground.

The graph above describes the motion of a ball. At what point does the ball have a velocity of zero?

C

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

suppose an object is in free fall. each second the object falls

a larger distance than in the second before

which of the following line segments on a position versus time graph is physically impossible

a vertical line

In the absence of air resistance, objects fall at constant

acceleration

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

Speed is

all of the options

The graph above describes the motion of a cyclist. During the interval shown, the cyclist is

speeding up

In the graph above, how does the acceleration at A compare with the acceleration at B

the acceleration at A and B are each zero

What does the graph above illustrate about acceleration?

the acceleration varies

When a car's velocity is positive and its acceleration is negative, what is happening to the car's motion?

the car slows down

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