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Chapter 3-3
Pressure and Gravity
Question | Answer |
---|---|
What is gravity? | The force of attraction between all objects in the universe. |
What is pressure? | The force particles of a fluid exert over a certain area due to their weight and motion. |
Why do your ears hurt when you dive to the bottom of a pool? | Because there is more pressure at the bottom of the pool than at the surface of the water. |
How do you convert your weight on Earth to your weight on the moon? | Multiply your weight by 1/6. |
Why do divers have to rise slowly? | Because nitrogen bubbles will develop in your blood. |
Why do you think that dams have to be thicker at the bottom? | Because the water pressure is higher at the bottom. |
Why do your ears sometimes hurt when you're flying in a plane? | Because the amount of air pressure is higher at higher altitudes. |
Calculate how much you would weigh on the moon if you weigh 133.5 lbs on Earth. | 22.25 lbs |
What is the acceleration due to gravity? | 9.8 m/s/s |
Why can you jump so high on the moon? | Because the moon's gravitational force is much less than the Earth's, making you weigh less. |
Calculate a semi-truck's weight on the moon if it weighs about 9,000 kg on the Earth (convert kg to lbs). | 9000 kg = about 3300 lbs |