Let's go through each question one by one and solve them with explanations.
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1. Newton’s Law of Inertia (first law) describes the motion of-
A Objects in motion only
B Objects that accelerate
C Objects at rest and objects that are in motion
D Objects at rest only
✔ Correct Answer: C. Objects at rest and objects that are in motion
Explanation:
Newton’s First Law, also known as the Law of Inertia, states that an object at rest stays at rest, and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force. So it applies to
both objects at rest and objects in motion.
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2. Which one of Newton’s Laws of Motion best explains why the dishes do not move when the tablecloth is removed?
✔ Correct Answer: B. Law of Inertia
Explanation:
When the tablecloth is pulled quickly, the dishes tend to stay at rest due to inertia. Since they have mass and resist changes in motion, they remain in place if the pull is fast enough (minimizing friction). This is a classic demonstration of
inertia — the tendency of objects to resist changes in their state of motion.
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3. Which law best explains why the coin sitting on top of the ring falls directly into the jar below because it wants to remain at rest?
✔ Correct Answer: A. Law of Inertia
Explanation:
The coin is initially at rest. When the ring is flicked away, the coin tends to stay at rest due to inertia. Gravity then pulls it down into the jar. The key idea here is that the coin resists the change in motion — it doesn’t move horizontally with the ring, so it drops straight down. This is again
inertia at work.
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4. Which law best explains why people remain in motion when a car crashes, if they are not wearing a seat belt?
✔ Correct Answer: B. Law of Inertia
Explanation:
When a car crashes, it stops suddenly. But the people inside continue moving forward at the same speed due to inertia — the tendency to maintain their original state of motion. Without a seat belt, they keep moving until stopped by something (like the dashboard or windshield). This is a direct application of
Newton’s First Law (Inertia).
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5. Which law best explains why more force must be applied to the bowling ball to make it accelerate at the same rate as the tennis ball?
(Note: The image shows 45 N applied to a bowling ball, and 2 N to a tennis ball — indicating the comparison.)
✔ Correct Answer: D. Law of Acceleration (Newton’s Second Law)
Explanation:
Newton’s
Second Law states:
F = ma → Force = mass × acceleration
To achieve the
same acceleration, a larger mass (like a bowling ball) requires a
larger force than a smaller mass (like a tennis ball). This is exactly what the question is illustrating — more force is needed for the heavier object to accelerate at the same rate. Hence, this is explained by the
Law of Acceleration.
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✔ Final Answers:
1.
C – Objects at rest and objects that are in motion
2.
B – Law of Inertia
3.
A – Law of Inertia
4.
B – Law of Inertia
5.
D – Law of Acceleration
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Parent Tip: Review the logic above to help your child master the concept of law of inertia worksheet.
