A 5-kg weight is hung from a hook. What do we know for certain about the forces

Question

A 5-kg weight is hung from a hook. What do we know for certain about the forces on the weight and the hook.

The force on the weight on the hook is exactly the same as the force of the hook on the weight.

The force on the weight on the hook is greater than the force of the hook on the weight.

The force on the weight on the hook is less than the force of the hook on the weight.

The force on the weight on the hook is the same strength but opposite in direction to the force of the hook on the weight.

There are no forces here at all.

10 points   

QUESTION 2

I use a certain amount of force to accelerate a box on the floor at 24 m/s^2. How should I change the force to change the box's acceleration to only 6 m/s^2?

Use 4x the original force

Use 2x the original force

Leave the force the same

Use 1/2 the original force

Use 1/4 the original force

10 points   

QUESTION 3

If an object feels a net force upward, what can we say for certain?

The object is accelerating upward

The object is moving upward

The biggest force on the object is upward

The object also feels a counter-force downward

Both A & B

10 points   

QUESTION 4

If I see a cart smoothly turn to from moving north to west, what can I say for certain about the car during its turn?

The net force on the car was to the north

The net force on the car was to the west

The net force on the car was to the east

The net force on the car was zero

The net force on the car was downward (into the ground)

10 points   

QUESTION 5

Which of the following best approximates the weight on Earth of a 30-kg mass?

3 N

20 N

30 N

300 N

3000 N

10 points   

QUESTION 6

Forces directly affect an object's acceleration, not its velocity.

True

False

10 points   

QUESTION 7

Single forces can be positive or negative in direction, but a net force is always positive.

True

False

10 points   

QUESTION 8

If the net force on an object is zero, than a position vs. time graph of the object could only show a flat line.

True

False

10 points   

QUESTION 9

Whenever two objects interact, by Newton's 3rd Law there will always have equal and opposite accelerations.

True

False

10 points   

QUESTION 10

Under equal amounts of net force, a more massive object accelerates slower than a less massive object.

True

False

A.

The force on the weight on the hook is exactly the same as the force of the hook on the weight.

B.

The force on the weight on the hook is greater than the force of the hook on the weight.

C.

The force on the weight on the hook is less than the force of the hook on the weight.

D.

The force on the weight on the hook is the same strength but opposite in direction to the force of the hook on the weight.

E.

There are no forces here at all.

Explanation / Answer

1)

The force on the weight on the hook is the same strength but opposite in direction to the force of the hook on the weight.

2)

Use 1/4 the original force

3)

The object is accelerating upward

4)

The net force on the car was to the west

5)

300 N

6) False

7) False

8) False

9) True

10) True

D.

The force on the weight on the hook is the same strength but opposite in direction to the force of the hook on the weight.

2)

E.

Use 1/4 the original force

3)

A.

The object is accelerating upward

4)

B.

The net force on the car was to the west

5)

D.

300 N

6) False

7) False

8) False

9) True

10) True

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