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Gravity (Grade 8)

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What is the acceleration of gravity?
  1. [math]1.8 m//s^2[/math]
  2. [math]5.0 m//s^2[/math]
  3. [math]9.8 m//s^2[/math]
  4. [math]8.9 m//s^2[/math]
Gravity and friction are two kinds of                .
  1. inertia
  2. forces
  3. masses
  4. gravity
                is the measure of the force of gravity on an object.
  1. Mass
  2. Weight
  3. Density
  4. Equation
The strength of the force of gravity between two objects depends on
  1. only the shapes of the objects.
  2. only the masses of the objects.
  3. only the distance between the objects.
  4. both the masses of the objects and the distance between them.
The force of gravity on a person or object at the surface of a planet is called                .
  1. mass
  2. gravity
  3. weight
Newton's law of universal gravitation states that
  1. every object in the universe attracts every other object.
  2. an object at rest will stay at rest, and an object in motion will stay in motion.
  3. the less mass an object has, the greater its inertia.
  4. only large planets have gravity.
The gravitational force of the Moon on Earth's oceans is stronger than the gravitational force of the Sun because the
  1. Moon is smaller than the Sun.
  2. Sun is made of only gas.
  3. Moon is closer to Earth than the Sun.
  4. Moon's craters attract water.
To escape from a planet's gravity, an object must reach a speed called the                                     .
The combination of initial forward velocity and downward vertical force of gravity cause a projectile to follow                   path.
Gravitational force on the Moon is 1/6th of that on Earth. Compare your mass and weight.

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