📚 Chapter 3: All Exercises & MCQs (with solutions)
Based on the Grade 11 Physics textbook (Ethiopia). These questions cover 3.1 to 3.5 – perfect for entrance exam revision. Click “Show Answer” to see full explanation.
3.1 Uniformly Accelerated Motion in 1D
1️⃣ Does negative acceleration necessarily mean slowing down?
(Activity 3.1, Q1)
2️⃣ Does positive acceleration always mean speeding up?
(Activity 3.1, Q2)
3️⃣ A car increases speed from rest to 20 m/s in 6 seconds. Its average acceleration is:
(Example 3.1 variant)
4️⃣ A driver accelerates from rest at 1.4 m/s². Time to reach 2.0 m/s is:
(Review Q 3.1, Q4a)
5️⃣ If a particle’s velocity is v(t) = t² – 2t, its acceleration at t=2 s is:
(Example 3.2 style)
3.2 Equations of Uniformly Accelerated Motion
6️⃣ A car starting from rest accelerates at 2.5 m/s² for 8 s. Distance covered?
(Example 3.3)
7️⃣ A car moving at 20 m/s brakes to stop over 50 m. Deceleration is:
(Example 3.3c)
8️⃣ An airplane lands at 40 m/s, decelerates at 1.5 m/s². Runway length needed?
(Example 3.4)
9️⃣ The distance covered in the nth second is given by:
(Review Q 3.2, Q6)
3.3 Graphical Representation
🔟 Slope of displacement-time graph gives:
1️⃣1️⃣ Area under velocity-time graph represents:
3.4 Vertical Motion
1️⃣2️⃣ A ball dropped from 45 m (g=10). Time to hit ground?
1️⃣3️⃣ A ball thrown upward at 15 m/s. Max height? (g=10)
1️⃣4️⃣ At terminal velocity, acceleration is:
3.5 Uniform Circular Motion
1️⃣5️⃣ Angular velocity of a particle moving at 4 m/s in a circle of radius 2 m is:
1️⃣6️⃣ Centripetal acceleration depends on:
1️⃣7️⃣ For a banked road (no friction), the correct relation is:
End of Unit Questions (Chapter 3)
1️⃣8️⃣ Which pair cannot both be constant and non-zero for a body?
1️⃣9️⃣ A girl walks 1 km north in 15 min, then 200 m southwest in 160 s. Average velocity?
2️⃣0️⃣ A bullet accelerates at 6.20×10³ m/s² for 8.10×10⁻⁴ s. Final velocity?
✅ All questions from Chapter 3 compiled. Keep practicing – entrance exam success 🚀