Force and Motion (8 Science)
Learn about forces, motion, Newton's laws, and friction. These fundamental concepts explain how objects move and interact with their environment.
TL;DR: Learn about forces, motion, Newton's laws, and friction. These fundamental concepts explain how objects move and interact with their environment.
Written & reviewed by the Syllab.in Academic Team (CBSE/NCERT subject experts) · Updated
Learn about forces, motion, Newton's laws, and friction. These fundamental concepts explain how objects move and interact with their environment.
Force and Motion MCQs with Answers & Explanations
Q1. What is force?
- Energy of an object
- A push or pull that changes motion ✓ (correct)
- Speed of an object
- Resistance of an object
Q2. Which of Newtons laws states that an object at rest will remain at rest unless acted upon by a force?
- First law of motion ✓ (correct)
- Second law of motion
- Third law of motion
- Law of gravitation
Q3. What is friction?
- A force that aids motion
- A force that opposes motion between surfaces in contact ✓ (correct)
- The tendency to remain in motion
- The weight of an object
Q4. How does friction affect the motion of objects?
- Increases speed
- Decreases speed ✓ (correct)
- Has no effect
- Increases mass
Q5. According to Newtons Second Law, what is the relationship between force, mass, and acceleration?
- F = m / a
- F = m + a
- F = m x a ✓ (correct)
- F = m - a
Q6. What is the SI unit of force?
- Kilogram
- Newton ✓ (correct)
- Meter per second
- Joule
Q7. What does Newtons Third Law of motion state?
- F = ma
- Action equals reaction
- For every action there is an equal and opposite reaction ✓ (correct)
- Force causes acceleration
Q8. What is the difference between speed and velocity?
- No difference
- Speed has direction but velocity does not
- Velocity has direction but speed does not ✓ (correct)
- Velocity is always greater
Q9. How can friction be reduced?
- Increase surface roughness
- Apply lubricants ✓ (correct)
- Increase pressure
- Reduce weight
Q10. What is acceleration?
- Speed of an object
- Change in velocity per unit time ✓ (correct)
- Distance traveled
- Time taken
Frequently Asked Questions
Why is friction sometimes helpful and sometimes harmful?
Friction is helpful for walking, writing, and braking vehicles. It is harmful when it causes energy loss in machinery and engines. Understanding friction helps us use it appropriately.
What is the difference between static and kinetic friction?
Static friction prevents an object from moving when a force is applied. Kinetic friction acts when an object is already moving. Static friction is usually greater than kinetic friction.
More 8 Science MCQs
- Light Reflection and Refraction
- Electricity
- Acids Bases and Salts
- Life Processes
- Carbon and its Compounds
- Metals and Non-metals
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