⚡ Mechanics

Chapter: Physics · Level ★★★ · Time: 25 min

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NameClassDate

After this worksheet you can

Apply kinematics equationsState Newton's three lawsUse momentum conservationCalculate work/energy/power

📚 Quick Recap

🎯 What you'll practice: The four kinematics equations, Newton's laws, momentum, and work-energy-power.

🧮 Section B · Problem Solving ● INTERMEDIATE 2 + 3×3 = 11

5Newton's law states that every action has an equal and opposite reaction.

6Efficiency = useful output ÷ total input × %.

7A car accelerates from 0 to 20 m/s in 5 s. Find its acceleration using v = u + at.

8A 2 kg object moves at 5 m/s. Calculate its kinetic energy.

9State the law of conservation of momentum in your own words.

🚀 Section C · Challenge ● CHALLENGE 5

10A rocket expels gas downward to accelerate upward. Explain this using Newton's third law and momentum conservation together.

💭 Reflection — the most useful thing I learned:

A ___/4 B ___/11 C ___/5 Total ___/20 Teacher's Signature Parent's Signature

✂ answer key — fold or cut before handing out

1-B 2-A 3-C 4-A | 5 = third 6 = 100 7 = a = (v−u)/t = (20−0)/5 = 4 m/s² 8 = KE = ½(2)(5²) = 25 J 9 = in a closed system with no external forces, the total momentum before an event (e.g. collision) equals the total momentum after | 10 = The rocket pushes exhaust gas downward with a large force; by Newton's third law, the gas pushes back on the rocket with an equal and opposite (upward) force. Because momentum is conserved for the rocket+gas system, the downward momentum given to the expelled gas is balanced by an equal upward momentum gained by the rocket, accelerating it forward even in the vacuum of space where there is nothing external to push against.

📄 Need offline practice?Print this worksheet or open the one-page cheat sheet.

🗒 Cheat Sheet

🧠 Section A · Concept Check ● BEGINNER 4 × 1 = 4

🧮 Section B · Problem Solving ● INTERMEDIATE 2 + 3×3 = 11

🚀 Section C · Challenge ● CHALLENGE 5