የ ስንተኛ ክፍል ተማሪ ናችሁ?

Try these questions on conservation of mechanical energy and linear momentum! Put reactions if you want the explanation and answers😉!

1. Which of the following best explains the law of conservation of mechanical energy?
A. Energy cannot be created or destroyed, but mass can.
B. The total mechanical energy of an isolated system remains constant if only conservative forces act.
C. Momentum is always conserved regardless of energy loss.
D. The kinetic energy of a system is always greater than potential energy.

2. In the absence of non-conservative forces, when a ball is thrown upward, its mechanical energy:
A. Increases until it reaches the top.
B. Decreases as it slows down.
C. Remains constant throughout its motion.
D. Becomes zero at the highest point.

3. Which of the following statements about impulse is correct?
A. Impulse is the rate of change of acceleration.
B. Impulse equals the product of force and distance.
C. Impulse is a vector and equals change in momentum.
D. Impulse only occurs in elastic collisions.

4. Momentum is conserved in a system when:
A. Only kinetic energy is conserved.
B. The system is open and friction is present.
C. There is no net external force acting on the system.
D. Energy is not converted to heat or sound.

5. In a perfectly inelastic collision, which quantity is always conserved?
A. Kinetic energy
B. Potential energy
C. Momentum
D. Mechanical energy



Calculation-Based Multiple Choice Questions

6. A 2 kg object falls from a height of 5 m. What is its speed just before hitting the ground?
(Take g = 10 m/s²)
A. 5 m/s
B. 7 m/s
C. 10 m/s
D. √(2 × 10 × 5) = 10 m/s

7. A 0.2 kg ball moving at 15 m/s hits a wall and rebounds with the same speed. What is the change in momentum?
A. 0
B. 3 kg·m/s
C. 6 kg·m/s
D. 9 kg·m/s


8. A 0.1 kg bullet is fired at 400 m/s from a 4 kg gun. What is the recoil velocity of the gun?
A. -10 m/s
B. -1 m/s
C. -0.5 m/s
D. -0.1 m/s

9. A 5 kg object moving at 6 m/s collides and sticks with a 3 kg object at rest. What is their common velocity after the collision?
A. 2.5 m/s
B. 3.75 m/s
C. 5 m/s
D. 6 m/s

10. A spring has a spring constant of 100 N/m and is compressed by 0.2 meters.
What is the potential energy stored in the spring?

A. 1 J
B. 2 J
C. 3 J
D. 4 J

Answers

1. B – The total mechanical energy of an isolated system remains constant if only conservative forces act.


2. C – Mechanical energy remains constant throughout the motion (as long as there's no friction or air resistance).


3. C – Impulse is a vector and equals the change in momentum (Impulse = Δp).


4. C – Momentum is conserved when there's no net external force on the system.


5. C – In perfectly inelastic collisions, momentum is conserved, though kinetic energy is not.





Calculation-Based Questions – Answers

6. D – v = √(2gh) = √(2 × 10 × 5) = √100 = 10 m/s


7. C – Δp = m(v_f - v_i) = 0.2(–15 – 15) = –6 → magnitude = 6 kg·m/s



8. B – m_bullet × v_bullet = m_gun × v_gun → 0.1×400 = 4×v → v = –10/1 = –10 m/s


9. B – (5×6 + 3×0)/(5+3) = 30/8 = 3.75 m/s

10. PE = (1/2) × 100 × (0.2)²
PE = 50 × 0.04
PE = 2 J

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Skeletal System Questions

1. 🧠 What is the main function of the skeletal system?
a) Digestion
b) Blood circulation
c) Support and protection
d) Oxygen transport

2. 🦴 How many bones does an average adult human skeleton have?
a) 106
b) 206
c) 306
d) 406

3. 🛡️ Which bone protects the brain?
a) Femur
b) Skull
c) Spine
d) Ribs

4. 🔄 What connects bones to each other at joints?
a) Ligaments
b) Tendons
c) Cartilage
d) Muscles

5. 💉 Where is blood produced in the skeletal system?
a) Bone marrow
b) Skull
c) Ligaments
d) Cartilage


💪 Muscular System Questions

6. 💪 What type of muscle is responsible for voluntary movement?
a) Cardiac muscle
b) Smooth muscle
c) Skeletal muscle
d) Involuntary muscle

7. ❤️ What type of muscle makes up the heart?
a) Smooth muscle
b) Skeletal muscle
c) Cardiac muscle
d) Voluntary muscle

8. 🔗 What connects muscles to bones?
a) Ligaments
b) Cartilage
c) Tendons
d) Joints

9. 🧬 What is the basic unit of a muscle called?
a) Bone cell
b) Muscle fiber
c) Ligament
d) Myelin

10. 🤸‍♀️ Which of the following is an example of a voluntary muscle movement?
a) Breathing
b) Beating of the heart
c) Digesting food
d) Raising your hand

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A quiet, helpful space with no pressure


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