Laws of Motion (11 Physics)
Study Newtons three laws of motion and their applications to understand how objects move and interact.
TL;DR: Study Newtons three laws of motion and their applications to understand how objects move and interact.
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Study Newtons three laws of motion and their applications to understand how objects move and interact.
Laws of Motion MCQs with Answers & Explanations
Q1. What does Newtons First Law state?
- F = ma
- Objects move in straight lines
- An object at rest stays at rest unless acted upon by force ✓ (correct)
- Energy is conserved
Q2. What is inertia?
- Force on an object
- Property that resists change in motion ✓ (correct)
- Acceleration of an object
- Energy of motion
Q3. What does Newtons Second Law state mathematically?
- F = v × t
- F = m × a ✓ (correct)
- a = v²/r
- v = u + at
Q4. If a 2 kg object experiences a force of 10 N, what is its acceleration?
- 5 m/s² ✓ (correct)
- 20 m/s²
- 2 m/s²
- 0.2 m/s²
Q5. What does Newtons Third Law state?
- F = ma
- For every action, there is an equal and opposite reaction ✓ (correct)
- Objects fall due to gravity
- Force equals momentum
Q6. What is the normal force?
- Weight of object
- Perpendicular contact force between surfaces ✓ (correct)
- Force due to gravity
- Applied force
Q7. What is tension in a string or rope?
- Weight of object
- Pulling force transmitted along string ✓ (correct)
- Force due to friction
- Compressive force
Q8. How do you find the net force on an object?
- Sum of all masses
- Vector sum of all forces ✓ (correct)
- Largest force only
- Average of forces
Q9. What does friction force depend on?
- Only the normal force
- Normal force and coefficient of friction ✓ (correct)
- Only mass
- Only velocity
Q10. What is an inertial frame of reference?
- Any frame of reference
- Frame with gravity
- Frame where Newtons laws apply ✓ (correct)
- Rotating frame
Frequently Asked Questions
Why does a passenger lurch forward when a car suddenly brakes?
This demonstrates Newtons First Law. The passenger wants to continue moving forward due to inertia. The car decelerates but the passenger continues until friction or seat restraint acts.
What is the difference between mass and weight?
Mass is the amount of matter (constant everywhere, measured in kg). Weight is gravitational force (W = mg, varies with gravity, measured in Newtons).
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