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Physics Worksheet
🍎 Newton's Laws
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After this worksheet you can
Understand: Newton's First Law (Inertia)Understand: Newton's Second LawUnderstand: Newton's Third LawUnderstand: Net Force🧠 Section A · Concept Check ● BEGINNER 4 × 1 = 4
1A 8 kg object has net force 40 N. Find acceleration.
2A 3 kg object accelerates at 7 m/s^2. Find net force.
3A 50 kg person stands still on a scale. What is the reaction force pair here (Newton's third law)?
4A car engine applies 2000 N force, and the car (mass 1000 kg) experiences 500 N of friction. Find the net force and acceleration.
🧮 Section B · Problem Solving ● INTERMEDIATE 4 × 3 = 12
5Why does a heavier object require more force to achieve the same acceleration as a lighter one?
6A book rests on a table without moving. What does this tell you about the net force on it?
7If a 1000 kg car needs to accelerate at 2 m/s^2, what net force is required?
8What law explains why passengers lurch forward when a car suddenly stops?
🚀 Section C · Challenge ● CHALLENGE 2 × 2 = 4
9A 6 kg object accelerates at 0 m/s^2. What can you conclude about the net force?
10Give a real-world example of Newton's Third Law.
💭 Reflection — the most useful thing I learned:
A ___/4 B ___/12 C ___/4 Total ___/20
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✂ answer key — fold or cut before handing out
1 = 5 m/s^2 2 = 21 N 3 = The person pushes down on the scale, and the scale pushes up on the person with equal force 4 = Net force=1500N, a=1500/1000=1.5 m/s^2 | 5 = F=ma means force needed is directly proportional to mass for a given acceleration 6 = The net force is zero (gravity and the table's normal force balance) 7 = 2000 N 8 = Newton's First Law (inertia) -- the passengers' bodies resist the sudden change in motion | 9 = The net force is 0 N 10 = Any valid example, e.g. walking (pushing backward on the ground, ground pushes you forward) or a swimmer pushing water backward to move forward