Newtons 3rd Law

• What does Newton's third law state about the forces between two interacting objects?

  The forces they exert on each other are equal and opposite
• What does the "equal" part of Newton's third law refer to?

  It refers to the magnitude of the two forces
• What does the "opposite" part of Newton's third law refer to?

  It refers to the direction of the two forces
• If you push a box with a force of 100 newtons, what force does the box exert on you?


  100 newtons
• What is the name of the force that the box exerts on you when you push it?

  Normal contact force
• What determines whether you or the box will move when you push it?

  The mass of the box and the force applied
• If the box is small, who is likely to move when pushed?

  The box is likely to move
• If the box is large, what might happen when you push it?

  You might be pushed backwards
• How is pushing off a wall similar to pushing a box?

  Both involve equal and opposite forces
• What happens if the box is medium-sized when you push it?

  You might get pushed backwards a little, and the box might still go forwards
• What is the equation related to Newton's second law?

  F = m a
• How can you rearrange the equation $F =$$m a$ to find acceleration?


  $a =$$\frac{F}{m}$
• What is required for an object to be accelerated and move?

  You need either a high force or a small mass
• What generally happens to the smaller object when a force is applied?

  The smaller object will generally move
• What are the key concepts of Newton's third law of motion?

  • Forces between two objects are equal and opposite
  • Magnitude refers to the equal part
  • Direction refers to the opposite part
  • Example: Pushing a box results in equal force exerted back
• How does mass affect movement when a force is applied?

  • Smaller mass: object likely to move
  • Larger mass: object less likely to move
  • Medium mass: both objects may move slightly
• What is the relationship between force, mass, and acceleration?

  • Newton's second law: $F =$$m a$
  • Rearranged for acceleration: $a =$$\frac{F}{m}$
  • High force or small mass needed for acceleration