50+ forces and newtons laws of motion worksheets on Quizizz | Free ... - Free Printable

Let's go through each question one by one and solve them with explanations.

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1. What is Newton's First Law known as? The Law of

A) Mass
B) Gravity
C) Friction
D) Inertia

✔ Correct Answer: D) Inertia

👉 Explanation:
Newton's First Law of Motion states that an object at rest stays at rest, and an object in motion stays in motion at constant speed and in a straight line unless acted upon by an unbalanced force. This property of objects to resist changes in motion is called inertia. So, Newton’s First Law is also known as the Law of Inertia.

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2. Because of inertia, a resting object _________.

A) will remain at rest
B) is unbalanced
C) will move at a constant speed
D) will eventually move

✔ Correct Answer: A) will remain at rest

👉 Explanation:
Inertia is the tendency of an object to resist changes in its state of motion. So, if an object is at rest, it will stay at rest unless a net (unbalanced) force acts on it. That’s exactly what inertia means.

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3. As more unbalanced force is applied to an object, its acceleration:

A) decreases
B) stays the same
C) increases

✔ Correct Answer: C) increases

👉 Explanation:
According to Newton’s Second Law of Motion:
F = m × a, so a = F / m
If mass stays constant and force increases, then acceleration increases proportionally.

So, more force → more acceleration.

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4. What is the formula for force?

A) F = A/M
B) F = M/A
C) F = M * A
D) F = M * F

✔ Correct Answer: C) F = M * A

👉 Explanation:
The formula for force is derived from Newton’s Second Law:
Force = Mass × Acceleration
So, F = m × a

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5. A 20 kg bike accelerates at 10 m/s². What was the force?

A) 30 Newtons
B) 200 Newtons
C) 2 Newtons
D) 10 Newtons

✔ Correct Answer: B) 200 Newtons

👉 Explanation:
Use the formula:
F = m × a
= 20 kg × 10 m/s²
= 200 N (Newtons)

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6. An object in motion stops when.....

A) It never stops
B) It falls off an edge
C) It is eaten
D) It is acted upon by an outside force

✔ Correct Answer: D) It is acted upon by an outside force

👉 Explanation:
Newton’s First Law says that an object in motion will continue in motion unless acted upon by an unbalanced external force. So, friction, air resistance, or any other external force can stop it. Without such forces, it would keep moving forever.

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7. The force that prevents a ball rolling on the ground from continuing on its path forever is...

*(Note: Question is cut off, but based on context, likely asking for the force that stops the ball)*

✔ Answer: Friction

👉 Explanation:
Even though the question is incomplete, the intended answer is friction.
Friction between the ball and the ground opposes motion and gradually slows the ball down. Without friction (and air resistance), the ball would keep rolling forever due to inertia.

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✔ Summary of Answers:

| Q# | Answer |
|----|--------|
| 1 | D) Inertia |
| 2 | A) will remain at rest |
| 3 | C) increases |
| 4 | C) F = M * A |
| 5 | B) 200 Newtons |
| 6 | D) it is acted upon by an outside force |
| 7 | Friction *(most likely expected answer)* |

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