quiz 5 questions projectiles

Question 1

A ___________________ is a body in free fall subject only to the forces of ___________________ and __________________ __________________.

Answer 1

projectile
gravity
and air resistance

Question 2

Which of the following affects the time that a horizontally projected object remains in the air?

projection height
all of these answers are correct
weight
mass

Question 3

Once a projectile is airborne, it is affected by which of the following?
Question 4 options:

air resistance

release velocity

all of these answers are correct

gravity

both gravity and air resistance

Question 4

Which of the following represents vertical acceleration of a projectile?
Question 1 options:

-9.81 m/s 2

0 m/s 2

-9.81 m/s

0 m/s

Question 5

At the apex of the trajectory of a projectile, vertical velocity is at its maximum.
Question 2 options:
True
False

Question 6

Which of the following factors typically exerts the most influence on the horizontal displacement obtained by a projectile?
Question 3 options:

relative height of projection

initial speed of projection

initial acceleration of projection

projection angle

Question 7

The highest point in the trajectory of a projectile is the ___________________.
Question 4 options:

Question 8

Which of the following is/are true regarding the apex in the trajectory of a projectile?
Question 5 options:

direction changes

both it is the highest point in the flight and vertical velocity is 0

it is the highest point in the flight

all of these answers are correct

vertical velocity is 0

Question 9

During a 5-km race, a runner averaged 15 km per hour. What was her final time?
Question 6 options:

A)

45 minutes

B)

3 hours

C)

0.33 hours

D)

0.36 minutes

Question 10

Velocity is –1 m/s if initial position was 0.05 m, final position 0 m, and change in time 0.05 s.

Question 7 options:
True
False

Question 11

Calculate the apex of a projectile relative to the ground if the initial vertical velocity of the object was 3 m/s and the height of release was 1 m above the ground.
Question 8 options:

A)

45.1 m

B)

1.15 m

C)

0.46 m

D)

1.46 m

Question 12

nstantaneous velocity is represented by the slope of a line tangent to the position–time curve.

Question 9 options:
True
False

Question 13

Zero acceleration indicates that velocity is
Question 10 options:

A)

positive.

B)

decreasing.

C)

constant.

D)

increasing.