# 4º ESO. Newton´s laws. Worksheet.

Newton´s first law (law of inertia)

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1. Write down Newton´s first law.
2. Use Newton´s first law to explain why seat bells are necessary.

Newton´s second law

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3. Write down (with words) Newton´s second law.
4. Write down Newton´s second law using a mathematical formula. Also, write down the units in the SI for all the magnitudes that appear on this formula.
5. Explain the difference between weight and mass.
6. Write down the formula to calculate the weight. Also, write down the units in the SI for all the magnitudes that appear in this formula.
7. What would happen if you drop a flat page and a crumpled page from the same height? Would they reach the floor at the same time? Why?

8. What would happen if you drop a flat page and a crumpled page from the same height on a vacuum? Would they reach the floor at the same time? Why?

Newton´s third law (law of action-reaction)

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9. Write down Newton´s third law.
10. How do space vehicles use Newton´s third law to lift off?

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