Physics Worksheet

🎱 Momentum

Chapter: Mechanics · Level ★★☆ · Time: 30 min

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NameClassDate

After this worksheet you can

Understand: Momentum DefinitionUnderstand: Units of MomentumUnderstand: Conservation of MomentumUnderstand: Elastic vs. Inelastic Collisions

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

1Find momentum of a 7 kg object at 9 m/s.

2Find momentum of a 20 kg object at 1.5 m/s.

3A 3 kg ball at 8 m/s hits a stationary 5 kg ball and they stick together. Find final velocity.

4A 2 kg ball moving at 10 m/s collides with a 3 kg ball moving at -4 m/s (opposite direction). Find total momentum before collision.

🧮 Section B · Problem Solving ● INTERMEDIATE 4 × 3 = 12

5What additional quantity is conserved in an elastic collision, beyond momentum?

6Why does kinetic energy typically decrease in an inelastic collision?

7A 1500 kg car moving at 20 m/s crashes into a stationary 1500 kg car and they lock together. Find their common velocity after impact.

8Why is momentum considered a vector rather than a scalar quantity?

🚀 Section C · Challenge ● CHALLENGE 2 × 2 = 4

9A 4 kg object moving at 5 m/s has its momentum measured. What are the units of this measurement?

10In a game of billiards, one ball strikes another and transfers most of its motion. What physical principle governs this transfer?

💭 Reflection — the most useful thing I learned:

A ___/4 B ___/12 C ___/4 Total ___/20 Teacher's Signature Parent's Signature

✂ answer key — fold or cut before handing out

1 = 63 kg*m/s 2 = 30 kg*m/s 3 = 24=8v, v=3 m/s 4 = 2*10+3*(-4)=20-12=8 kg*m/s | 5 = Kinetic energy 6 = Some kinetic energy converts into other forms, such as heat, sound, or deformation of the objects 7 = 30000=3000v, v=10 m/s 8 = It depends on both mass (a scalar) and velocity (a vector), so momentum inherits a direction | 9 = kg*m/s 10 = Conservation of momentum (and approximately conservation of kinetic energy, since billiard collisions are nearly elastic)