##### Motion in one dimentsion

11th grade, 12th grade

Acceleration is

a. displacement

b. the rate of change of displacement

c. velocity

d. the rate of change of velocity

d. The rate of change of velocity

When velocity is positive and acceleration is negative, what happens to the objects motion?

a. the object slows down

b. the object speeds up

c. nothing happens to the object

d. the object remains at rest

a. the object slows down

Acceleration due to gravity is also called

a. negative velocity

b. displacement

c. free-fall acceleration

d. instantaneous velocity

c. free fall acceleration

A baseball catcher throws a ball vertically upward and catches it at the same spot as it returns to the mitt. At what point in the ball's path does it experience zero velocity and nonzero acceleration at the same time?

a. midway on the way up

b. at the top of its trajectory

c. at the instant it leaves the catchers hand

d. the instant before it arrives at the catcher's

mitt.

b. at the top of its trajectory

When there is no air resistance, objects of different mass

a. fall with equal acceleration with equal

displacements

b. fall with different accelerations with

different displacements

c. fall with equal acceleration with

different displacements

d. fall with different accelerations with

similar displacements

a. fall with equal acceleration with equal

displacements.

Which would hit the ground first if dropped from the same height in a vacuum, a feather or a metal bolt?

a. the feather

b. the bolt

c. they would hit the ground at the same time

d. they would be suspended in a vacuum

c. they would hit the ground at the same time

Which would fall with greater acceleration in a vacuum, a leaf or a stone?

a. the leaf

b. the stone

c. they would accelerate at the same rate

d. it is difficult to determine without more

information

c. they would accelerate at the same rate.

If an object has constant acceleration, its

a. displacement changes at a constant rate

b. velocity changes at a constant rate

c. acceleration changes at a constant rate

d. acceleration must be zero

b. velocity changes at a constant rate

When someone flies completely around the world:

a. they have traveled a great displacement

b. they have traveled no total distance

c. they have traveled no total displacement

d. their distance traveled and displacement are

equal

c. they have traveled no total displacement

In a graph of displacement vs time, the slope of the line at any point:

a. is the displacement

b. is the velocity

c. is the acceleration

d. has no physical significance

b. is the velocity

The area under the velocity-time graph between any two time intervals is

a. the displacement

b. the velocity

c. the acceleration

d. has no physical significance

a. the displacement.

A ball is thrown vertically upward near the surface of the Earth. While the ball is upward its acceleration is

a. 0

b. in the same direction as its velocity

c. opposite to its velocity

d. equal to its change in velocity

e. in the same direction as its displacement

c. opposite to its velocity

A ball is thrown vertically downward near the surface of the Earth. While the ball is going downward its acceleration is

a. 0

b. in the same direction as its velocity

c. opposite to its velocity

d. equal to its change in velocity

e. in the same direction as its initial velocity

b. in the same direction as its velocity

A ball is thrown vertically upward near the surface of the Earth. While the ball is at maximum altitude its acceleration is

a. 0

b. in the same direction as its velocity

c. opposite its velocity

d. equal to its change in velocity

e. opposite to its displacement

e. opposite to its displacement

A racecar traveling in a straight line with a negative velocity experiences a positive acceleration. The speed of the racecar

a. increases

b. decreases

c. remains constant

c. decreases

A stone is thrown straight up and reaches a height H before falling back to the ground T seconds later. Its average velocity during the time T is

a. 0

b. H/2T

c. H/T

d. 2H/t

a. 0

A ball is thrown upwards. After it has left the had its acceleration

a. remains constant

b. decreases

c. increases

d. is zero

a. remains constant

An object is dropped from rest. If it falls a distance s1 during the first second and an additional distance s2 during the next second, the ratio s2/s1 is

a. 1

b. 2

c. 3

d. 5

c. 3

A stone is thrown straight up and reaches a height H before falling back down to ground T seconds later. Its average speed during the interval T is

a. 0

b. H/2T

c. H/T

d. 2H/t

d, 2H/T

A stone of mass m1 is dropped from the roof of a tall building. At the same instant, another stone of mass m2 is dropped from a window 10 m below the roof. The distance between the two stones during their flight

a. decreases

b. remains 10 m throughout

c. increases

d. depends on the ratio of m2/m1

b. remains 10 m throughout.