QUESTION 1 A boy throws a football. After the ball leaves his hand, which of the

Question

QUESTION 1

A boy throws a football. After the ball leaves his hand, which of the following are forces that could be acting on the ball? (Assume air resistance is negligible.)

Gravitational force

Applied force

Normal force

No forces acting on the ball

1 points   

QUESTION 2

A box slides rightward at constant velocity on a slick (frictionless) table. Which of the following forces could be included in the freebody diagram of the box?

Normal force

Gravitational force

Applied force

No forces acting on the box

1 points   

QUESTION 3

A box slides rightward speeding up on a slick (frictionless) table. Which of the following forces could be included in the freebody diagram of the box?

Normal force

Gravitational force

Applied force

No forces acting on the box

1 points   

QUESTION 4

A box slides rightward on a table slowing down. In which direction is the net force?

Up

Down

Left

Right

Net force is zero.

1 points   

QUESTION 5

A box slides rightward at constant velocity. In which direction is the net force?

Up

Down

Left

Right

Net force is zero.

1 points   

QUESTION 6

A man jumps out of a plane. After a few moments of falling downwards, he deploys his parachute and begins to slow down. In what direction is the net force?

Up

Down

Left

Right

Net force is zero.

1 points   

QUESTION 7

Given the following freebody diagram for a stationary object, find the magnitude of the unknown force F

1.5 points   

QUESTION 8

Given the following freebody diagram for a stationary object, find the angle of the unknown force F.

1.5 points   

QUESTION 9

A book sits motionless on a table. There are two forces acting on the book, an upward normal force by the table acting on the book and a downward gravitational force by the earth acting on the book. Newton's third law says that for every force there is an equal and opposite reaction force.

Since the normal force and gravitational force are equal and opposite, they form Newton's third law force pair.

True

False

I need answe ASAP PLEASE

Gravitational force

Applied force

Normal force

No forces acting on the ball

Explanation / Answer

1. after the ball leaves the hand, only the force of gravit is acting on the ball

hence

option A

2. for the block moving towards right on a slick surface

The free body diagram should have

Normal force

Gravitaitnoal force

hence option A, B

3. for a speeeding up block on slick surface, the applied force has to be non zero

hence

option A, B, C

4. for a block slowing down, the net force is opposite to the direction of motion

hence left

option c

5. for a block sliding at constant velocity

net force = 0 ( newtons second law)

hence

optoin E

6. for the man who is slowing down

the net acceleration is upwards and hence so is thwe total force

so

option A

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