Newton's law of universal gravitation
Grade 11 Science Worksheet
Circle the best answer, or write your answer on the line.
Earth's mass is 5.9722 × 10²⁴ kg and its radius is 6371 km. With G = 6.674 × 10⁻¹¹ N·m²/kg², what is g at its surface, to the nearest hundredth, Ari?
The Moon's mass is 7.346 × 10²² kg and its radius is 1737.4 km. With G = 6.674 × 10⁻¹¹ N·m²/kg², what is g at its surface, to the nearest hundredth, Esme?
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Pull of a planet on a 100 kg probe (example data)
Distance from center (planet radii) Pull (N) 1 900 2 225 3 100 4 ? Using the table, what pull should the probe feel at 4 planet radii, Jun?
- 56.25 N
- 225 N
- 75 N
Using the table, how does the pull change from 1 to 3 planet radii, Kira?
- It drops to one-third
- It drops to one-ninth
- It drops by 3 N
Using the table, what is the planet's g at its surface, Luz?
- 90 N/kg
- 900 N/kg
- 9 N/kg
A model satellite's path is 400 km above Earth's surface, and Earth's radius is 6371 km. What distance r goes into the gravity formula, Milo?
- 6771 km
- 5971 km
- 400 km, the height
A probe is 6371 km above Earth's surface, and Earth's radius is 6371 km. How does Earth's pull on it compare with the pull at the surface, Noah?
- Zero, since it is in space
- One-quarter as strong
- Half as strong
Why is r measured between the centers of the two bodies, Pia?
- Gravity starts at the surface
- A round body pulls as if its mass were at its center
- Surfaces are too hard to measure
NASA gives Mars a surface gravity of 3.73 m/s². What does a 2 kg box weigh there, Ren?
- 2 N, the same as its mass
- 0.54 N
- 7.46 N
The Moon's surface gravity is 1.62 m/s² and Earth's is 9.82 m/s². About what fraction of its Earth weight does a box have on the Moon, Tala?
- About one-sixth
- About half
- The same