Newton's law of universal gravitation

Answer Key - Grade 11 Science Worksheet - Building Confidence

Circle the best answer, or write your answer on the line.

1. 1.

   A space probe feels a pull of 36 N from a planet. If its distance from the planet's center becomes 2 times as large, what pull does it feel, Ari?

   9 N
2. 2.

   A space probe feels a pull of 80 N from a planet. If its distance from the planet's center becomes 4 times as large, what pull does it feel, Bo?

   5 N
3. 3.

   A space probe feels a pull of 72 N from a planet. If its distance from the planet's center becomes 3 times as large, what pull does it feel, Esme?

   8 N
4. 4.

   Orbit diagram (NASA fact sheets). In the diagram, which way does Earth's pull on the Moon point, Luz?

   • Along the Moon's path
   • Toward Earth's center
   • Away from Earth
5. 5.

   One of two masses doubles at the same distance. What happens to the gravitational force between them, Milo?

   • It doubles
   • It is 4 times as big
   • It halves
6. 6.

   Both masses double at the same distance. What happens to the gravitational force between them, Noah?

   • It stays the same, since both changed
   • It is 4 times as big
   • It doubles
7. 7.

   A 2 kg box and a 1 kg box sit near each other. Which pulls on the other harder by gravity, Pia?

   • Neither: the pulls are equal
   • The 1 kg box pulls harder
   • The 2 kg box pulls harder
8. 8.

   Which pairs of objects attract each other by gravity, Ren?

   • Planets and stars, but not small things
   • Every pair of objects with mass
   • Objects that are touching
9. 9.

   Why don't two boxes on a table visibly pull together, Tala?

   • The table blocks gravity
   • Gravity doesn't act between small objects
   • Their pull on each other is far too small to notice
10. 10.

    G = 6.674 × 10⁻¹¹ N·m²/kg². What does its tiny size tell you, Zee?

    • G is the same as g
    • Gravity is strong between small objects
    • Gravity between everyday masses is very weak