Newton's Laws

• An object at rest will remain at a rest, and an object moving at a constant velocity will continue moving at a constant velocity, unless it is acted upon by an unbalanced force.

  Newton's 1st Law
• If a net force is applied to an object, it will accelerate at a rate proportional to the net force applied and inversely proportional to its mass.

  Newton's 2nd law
• For every action there is an equal and opposite reaction.

  Newton's 3rd Law
• An object will remain in its state of motion unless acted on by a non-zero net force (total force).

  Newton's 1st Law
• ∑F≠0


  Newton's 1st Law
• ∑F=ma

  Newton's 2nd Law
• A baseball hitting a bat?

  Action Force: Ball on Bat

  Reaction Force: Bat on Ball
• A baseball pushing a glove left as it's caught?

  Action Force: Ball on Glove

  Reaction Force: Glove on Ball
• A kangaroo jumping on a trampoline?

  Action Force: Kangaroo on Trampoline

  Reaction Force: Trampoline on Kangaroo
• If a person runs into the door, does door or the person experience a greater force?

  Neither
• Does the moon or the earth feel a greater gravitational force?

  Neither
• What is the equal and opposite reaction to you walking across the room?

  Floor on Foot