Great! Let's go through
Question 2 and
Question 3 step by step, using the context of
Newton's First Law of Motion.
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✔ Q.2: Use the words in the box to complete sentences about Newton's first law of motion.
The key terms are:
- unbalanced force
- in motion
- at rest
- balanced force
Let’s analyze each part:
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#### a) An object at rest tends to stay
at rest.
✔ Correct.
This is part of Newton’s First Law: an object will remain at rest unless acted upon by an unbalanced force.
> 🔹 *Explanation:* If no net force acts on an object, it will not start moving if it's already at rest.
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#### b) An object in motion tends to stay
in motion.
✔ Correct.
Again, this is Newton’s First Law: an object in motion will continue moving with constant velocity (same speed and direction) unless acted upon by an unbalanced force.
> 🔹 *Explanation:* This is why seatbelts are important — without a force (like a seatbelt), your body continues moving forward during a sudden stop.
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#### c) An object acted upon by
balanced force stays at rest.
✔ Correct.
When forces are balanced (equal in size, opposite in direction), there is
no net force, so the object does not accelerate. If it was at rest, it remains at rest.
> 🔹 *Explanation:* In the image, two people pushing equally on a box from both sides cancel each other out → balanced forces → no motion.
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#### d) An object acted upon by
unbalanced force changes speed and direction.
✔ Correct.
An unbalanced force causes acceleration (change in velocity), which includes changes in speed or direction.
> 🔹 *Explanation:* One person pushing the box while no one opposes → net force → the box accelerates (starts moving).
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✔ So, all answers you filled in are
correct!
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✔ Q.3: Which of the following terms is defined as the tendency of objects to resist changes in their state of motion?
Options:
a) Speed
b) Inertia
c) Force
d) Mass
➡️ The correct answer is:
b) Inertia
> 🔹
Explanation:
Inertia is the property of matter that resists changes in its state of motion. It's directly related to
mass — the greater the mass, the greater the inertia.
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Speed is how fast something moves.
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Force is a push or pull that can change motion.
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Mass is the amount of matter, but
inertia is the *tendency* to resist change.
> 📌 Example: A heavy truck has more inertia than a bicycle — it’s harder to start, stop, or turn.
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✔ Final Answers:
Q.2:
a) at rest
b) in motion
c) balanced force
d) unbalanced force
Q.3: b) Inertia
Let me know if you'd like a diagram or further explanation!
Parent Tip: Review the logic above to help your child master the concept of newton laws worksheet answers.
