Q: According to Newton's 2nd Law, what is the correct formula for calculating acceleration when the net force $$F_{\text{net}}$$ and mass $$m$$ are known?

$$a = \frac{F_{\text{net}}}{m}$$

Q: A 10 kg box is pushed to the right with a force of 100 N and to the left with a force of 30 N. What is the acceleration of the box? (Assume right is positive.)

$$a = \frac{100 - 30}{10} = 7\ \text{m/s}^2$$

Q: A 6 kg box is pushed to the right with 20 N and to the left with 20 N. What is its acceleration?

$$a = \frac{20 - 20}{6} = 0\ \text{m/s}^2$$

Q: A 2 kg object is acted upon by a net force of $$12\ \text{N}. $$What is its acceleration?

$$a = \frac{12}{2} = 6\ \text{m/s}^2$$

Q: A box is pushed to the right with $$20\ \text{N}$$ and to the left with $$10\ \text{N}. If $$its mass is $$5\ \text{kg}$$, what is its acceleration?

$$a = \frac{20 - 10}{5} = 2\ \text{m/s}^2$$

Q: A 10 kg box is pushed to the right with $$70\ \text{N}$$ and to the left with $$100\ \text{N}. $$What is the acceleration of the box? (Assume right is positive.)

$$a = \frac{70 - 100}{10} = -3\ \text{m/s}^2$$

Question 1

According to Newton's 2nd Law, what is the correct formula for calculating acceleration when the net force $$F_{	ext{net}}$$ and mass $$m$$ are known?

Accepted Answer

$$a = \frac{F_{	ext{net}}}{m}$$

Question 2

A 10 kg box is pushed to the right with a force of 100 N and to the left with a force of 30 N. What is the acceleration of the box? (Assume right is positive.)

Accepted Answer

$$a = \frac{100 - 30}{10} = 7\ 	ext{m/s}^2$$

Question 3

Which statement best describes inertia according to Newton's 1st Law?

Accepted Answer

Inertia is the resistance of an object to changes in its velocity unless acted upon by a net force.

Question 4

A 6 kg box is pushed to the right with 20 N and to the left with 20 N. What is its acceleration?

Accepted Answer

$$a = \frac{20 - 20}{6} = 0\ 	ext{m/s}^2$$

Question 5

If a 10 kg box accelerates to the right at $$5\ 	ext{m/s}^2$$ and is pushed by two forces, one of which is $$30\ 	ext{N} to $$the left, what is the magnitude of the other force?

Accepted Answer

$$60\ 	ext{N}$$

Question 6

A 10 kg box accelerates to the left at $$6\ 	ext{m/s}^2$$, pushed by two forces. If the box is pushed right with $$70\ 	ext{N}$$, calculate the other force. Assume the direction of positive is to the right.

Accepted Answer

$$130\ 	ext{N}$$

Question 7

Which of the following best describes the direction of acceleration when solving $$F_{	ext{net}} = ma$$?

Accepted Answer

The sign of acceleration indicates the direction relative to the chosen positive axis.

Question 8

A 2 kg object is acted upon by a net force of $$12\ 	ext{N}. $$What is its acceleration?

Accepted Answer

$$a = \frac{12}{2} = 6\ 	ext{m/s}^2$$

Question 9

If the net force on an object is zero, what happens to its velocity?

Accepted Answer

It remains constant.

Question 10

A 5 kg box is at rest. Two forces act on it: $$F_1 = 8$$\ 	ext{N}$$ to the right and F_2$ = 8\ 	ext{N} to $$the left. What is the acceleration of the box?

Accepted Answer

$$a = 0\ 	ext{m/s}^2$$

Question 11

Which of the following is true about the net force acting on an object?

Accepted Answer

Net force is the sum of all forces acting on an object, considering their directions.

Question 12

A 3 kg object is pushed to the right with $$12\ 	ext{N}. $$What is its acceleration?

Accepted Answer

$$a = 4\ 	ext{m/s}^2$$

Question 13

If a heavier object and a lighter object are both acted upon by the same net force, which statement is correct?

Accepted Answer

The heavier object will accelerate less than the lighter object.

Question 14

A box is pushed to the right with $$20\ 	ext{N}$$ and to the left with $$10\ 	ext{N}. If $$its mass is $$5\ 	ext{kg}$$, what is its acceleration?

Accepted Answer

$$a = \frac{20 - 10}{5} = 2\ 	ext{m/s}^2$$

Question 15

Which of the following is the correct unit for force in the SI system?

Accepted Answer

newton ($$	ext{N})$$

Question 16

A 10 kg box is pushed to the right with $$70\ 	ext{N}$$ and to the left with $$100\ 	ext{N}. $$What is the acceleration of the box? (Assume right is positive.)

Accepted Answer

$$a = \frac{70 - 100}{10} = -3\ 	ext{m/s}^2$$

Question 17

When expanding $$\sum F$$, how should you write forces that are ALONG the positive direction?

Accepted Answer

With a positive sign

Question 18

A box is moving at $$5\ 	ext{m/s}$$ with no forces acting on it. What will happen to its motion?

Accepted Answer

It will continue moving at $$5\ 	ext{m/s}$$ indefinitely.

Question 19

Which of the following is NOT a step in solving force problems as outlined in the study materials?

Accepted Answer

Ignore the direction of forces

Forces and Newton's Laws: Study Notes

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