quizz 6

Question 1

A ball is tossed vertically upward from a height of 2 m with an initial velocity of 10 m/s. Just before the ball hits the ground, its velocity will be what?

Question 1 options:

slower than 10 m/s

10 m/s

not possible to predict

faster than 10 m/s

Answer 1

greater than 10m/s
11.2m/s

Question 2

Which of the following represents vertical acceleration of a projectile?
Question 2 options:

-9.81 m/s

-9.81 m/s 2

0 m/s

0 m/s

Answer 2

-9.81 m/s2

Question 3

Which of the following components of projectile motion is affected by gravity?
Question 3 options:

horizontal component

depends on the individual situation

both vertical component and horizontal component

vertical component

Answer 3

vertical only

Question 4

The shape of a projectile’s trajectory is influenced by which of the following?
Question 4 options:

all of these answers are correct

speed of projection

angle of projection

both angle of projection and air resistance

air resistance

Answer 4

all of them

Question 5

Which of the following is an example of projectile motion?
Question 5 options:

a long jumper while in the air

a badminton shuttlecock during flight

none of these answers is correct

both a badminton shuttlecock during flight and a long jumper while in the air

Answer 5

D)

Question 6

Which of the following represents horizontal acceleration of a projectile?
Question 6 options:

-9.81 m/s

0 m/s 2

-9.81 m/s 2

0 m/s

Answer 6

b=0m/s2

Question 7

Once a projectile is airborne, it is affected by which of the following?
Question 7 options:

air resistance

both gravity and air resistance

gravity

release velocity

all of these answers are correct

Answer 7

b) both gravity and air resistance

Question 8

Which of the following affects the time that a horizontally projected object remains in the air?
Question 8 options:

projection height

mass of projectile

weight of projectile

all of these answers are correct

Answer 8

all of them

Question 9

The highest point in the trajectory of a projectile is the ___________________.

Question 10

Which of the following is/are true regarding the apex in the trajectory of a projectile?

vertical velocity is 0

all of these answers are correct

it is the highest point in the flight

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

direction changes

Question 11

Neglecting the effect of air resistance, which of the following is/are true regarding the horizontal component of projectile velocity?
changes according to gravitational acceleration

equal to 0

both remains constant throughout flight and changes according to gravitational acceleration

remains constant throughout flight

Question 12

When a long jump performance is analyzed, which of the following is likely to be of the most interest?

the instantaneous velocity of the jumper at landing

the average velocity of the jumper during the flight

the average velocity of the jumper during the run-up

the instantaneous velocity of the jumper at takeoff

Question 13

Why do elite long jumpers have take-off angles far less than the optimal 45°?
Question 5 options:

both take-off velocity is higher during lower take-off angles and relative take-off height is zero

take-off velocity is higher during lower take-off angles

none of these answers is correct

relative take-off height is zero

Question 14

A ___________________ is a body in free fall subject only to the forces of ___________________ and __________________ __________________.
Question 6 options:
Blank # 1
Blank # 2
Blank # 3

Question 15

Which of the following affects the time that a horizontally projected object remains in the air?
Question 7 options:

projection height

weight

all of these answers are correct

mass

Question 16

Which of the following represents vertical acceleration of a projectile?
Question 8 options:

0 m/s

0 m/s 2

-9.81 m/s 2

-9.81 m/s

Question 17

At the apex of the trajectory of a projectile, vertical velocity is at its maximum.
Question 9 options:
True
False