Which Law online exercise for - Free Printable
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Step-by-step solution for: Which Law online exercise for
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Step-by-step solution for: Which Law online exercise for
Let's solve this worksheet step by step. The goal is to:
1. Fill in the missing words in Newton’s three laws of motion.
2. Identify which law (First, Second, or Third) applies to each of the 10 scenarios.
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#### Newton’s First Law of Motion:
> An object at rest stays at rest, or an object that is moving at a constant speed in a straight line keeps moving at that speed unless another force acts on it.
✔ This is the Law of Inertia.
---
#### Newton’s Second Law of Motion:
> The amount of force needed to make an object change its motion depends on the mass of the object and the acceleration required.
✔ Formula: $ F = ma $
---
#### Newton’s Third Law of Motion:
> For every action (or force), there is an equal and opposite action (or force).
✔ "For every action, there is an equal and opposite reaction."
---
Now let’s go through each example and determine which law applies.
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1. A frog leaping upward off his lily pad is pulled downward by gravity and lands on another lily pad instead of continuing on in a straight line.
- The frog was moving upward but gravity changed its motion.
- This shows that a force (gravity) changes motion — but more importantly, it doesn't continue in a straight line because of gravity.
- However, the key idea here is that the frog would keep going in a straight line if no force acted — but gravity pulls it down.
- This illustrates inertia being overcome by a force → First Law.
✔ Answer: First Law
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2. As the fuel in a rocket ignites, the force of the gas expansion and explosion pushes out the back of the rocket and pushes the rocket forward.
- The rocket pushes gas backward, and the gas pushes the rocket forward.
- Action-reaction pair → Third Law
✔ Answer: Third Law
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3. When you are standing up in a subway train, and the train suddenly stops, your body continues to go forward.
- Your body wants to keep moving at the same speed due to inertia.
- This is a classic example of First Law.
✔ Answer: First Law
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4. After you start up your motorbike, as you give it more gas, it goes faster.
- Increasing force (more gas) increases acceleration.
- Relates to $ F = ma $ → Second Law
✔ Answer: Second Law
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5. A pitched baseball goes faster than one that is gently thrown.
- More force applied → greater acceleration → higher speed.
- Again, relates to Second Law.
✔ Answer: Second Law
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6. A swimmer pushes water back with her arms, but her body moves forward.
- She pushes water backward (action), water pushes her forward (reaction).
- Third Law
✔ Answer: Third Law
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7. As an ice skater pushes harder with his leg muscles, he begins to move faster.
- Greater force → greater acceleration.
- Second Law
✔ Answer: Second Law
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8. When Bobby, age 5, and his dad are skipping pebbles on the pond, the pebbles that Bobby's dad throws go farther and faster than his.
- Dad applies more force → greater acceleration → faster/farther.
- Difference in force affecting motion → Second Law
✔ Answer: Second Law
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9. When you paddle a canoe, the canoe goes forward.
- You push water backward with the paddle → water pushes canoe forward.
- Action-reaction → Third Law
✔ Answer: Third Law
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10. A little girl who has been pulling a sled behind her in the snow is crying because when she stopped to tie her hat on, the sled kept moving and hit her in the back of her legs.
- Sled was moving and continued moving even after she stopped.
- Inertia — object in motion stays in motion → First Law
✔ Answer: First Law
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| Number | Answer |
|--------|--------|
| 1 | First Law |
| 2 | Third Law |
| 3 | First Law |
| 4 | Second Law |
| 5 | Second Law |
| 6 | Third Law |
| 7 | Second Law |
| 8 | Second Law |
| 9 | Third Law |
| 10 | First Law |
---
- First Law: Objects resist changes in motion (inertia).
- Second Law: Force causes acceleration; $ F = ma $.
- Third Law: Every action has an equal and opposite reaction.
Let me know if you'd like this formatted for printing or as a completed worksheet!
1. Fill in the missing words in Newton’s three laws of motion.
2. Identify which law (First, Second, or Third) applies to each of the 10 scenarios.
---
🔹 Step 1: Fill in the blanks for Newton’s Laws
#### Newton’s First Law of Motion:
> An object at rest stays at rest, or an object that is moving at a constant speed in a straight line keeps moving at that speed unless another force acts on it.
✔ This is the Law of Inertia.
---
#### Newton’s Second Law of Motion:
> The amount of force needed to make an object change its motion depends on the mass of the object and the acceleration required.
✔ Formula: $ F = ma $
---
#### Newton’s Third Law of Motion:
> For every action (or force), there is an equal and opposite action (or force).
✔ "For every action, there is an equal and opposite reaction."
---
🔹 Step 2: Match Each Scenario to the Correct Law
Now let’s go through each example and determine which law applies.
---
1. A frog leaping upward off his lily pad is pulled downward by gravity and lands on another lily pad instead of continuing on in a straight line.
- The frog was moving upward but gravity changed its motion.
- This shows that a force (gravity) changes motion — but more importantly, it doesn't continue in a straight line because of gravity.
- However, the key idea here is that the frog would keep going in a straight line if no force acted — but gravity pulls it down.
- This illustrates inertia being overcome by a force → First Law.
✔ Answer: First Law
---
2. As the fuel in a rocket ignites, the force of the gas expansion and explosion pushes out the back of the rocket and pushes the rocket forward.
- The rocket pushes gas backward, and the gas pushes the rocket forward.
- Action-reaction pair → Third Law
✔ Answer: Third Law
---
3. When you are standing up in a subway train, and the train suddenly stops, your body continues to go forward.
- Your body wants to keep moving at the same speed due to inertia.
- This is a classic example of First Law.
✔ Answer: First Law
---
4. After you start up your motorbike, as you give it more gas, it goes faster.
- Increasing force (more gas) increases acceleration.
- Relates to $ F = ma $ → Second Law
✔ Answer: Second Law
---
5. A pitched baseball goes faster than one that is gently thrown.
- More force applied → greater acceleration → higher speed.
- Again, relates to Second Law.
✔ Answer: Second Law
---
6. A swimmer pushes water back with her arms, but her body moves forward.
- She pushes water backward (action), water pushes her forward (reaction).
- Third Law
✔ Answer: Third Law
---
7. As an ice skater pushes harder with his leg muscles, he begins to move faster.
- Greater force → greater acceleration.
- Second Law
✔ Answer: Second Law
---
8. When Bobby, age 5, and his dad are skipping pebbles on the pond, the pebbles that Bobby's dad throws go farther and faster than his.
- Dad applies more force → greater acceleration → faster/farther.
- Difference in force affecting motion → Second Law
✔ Answer: Second Law
---
9. When you paddle a canoe, the canoe goes forward.
- You push water backward with the paddle → water pushes canoe forward.
- Action-reaction → Third Law
✔ Answer: Third Law
---
10. A little girl who has been pulling a sled behind her in the snow is crying because when she stopped to tie her hat on, the sled kept moving and hit her in the back of her legs.
- Sled was moving and continued moving even after she stopped.
- Inertia — object in motion stays in motion → First Law
✔ Answer: First Law
---
✔ Final Answers:
| Number | Answer |
|--------|--------|
| 1 | First Law |
| 2 | Third Law |
| 3 | First Law |
| 4 | Second Law |
| 5 | Second Law |
| 6 | Third Law |
| 7 | Second Law |
| 8 | Second Law |
| 9 | Third Law |
| 10 | First Law |
---
📝 Summary of Newton’s Laws:
- First Law: Objects resist changes in motion (inertia).
- Second Law: Force causes acceleration; $ F = ma $.
- Third Law: Every action has an equal and opposite reaction.
Let me know if you'd like this formatted for printing or as a completed worksheet!
Parent Tip: Review the logic above to help your child master the concept of basic skills physical science 6 8 worksheet answers.
