Gravity, Friction, And Motion

• is caused by the Earth's mass pulling on all other masses around it.

  Gravity
• states that the force of gravity acts between all objects in the universe.

  Newton's law
• the force of gravity that pulls an apple or any other object toward the ground

  weight
• gravity is weaker on the ___ than on earth

  moon
• the force you exert as you push or pull is opposed by

  friction
• enables you to control movement. it prevents you from slipping when you walk.

  friction
• friction increases with the ___ of an object.

  mass
• friction does not only oppose motion but can create

  heat
• a type of friction too. exists between aair and an object moving through it.

  air resistance
• Friction may be increased by making the surfaces


  rough
• Is a substance that can reduce friction between solid substances

  lubricants
• can both increase and decrease friction

  water
• If you travel from Earth to moon the ___ will be directly affected

  weight