Topic 2 - Newton's Laws

• What is inertia?


  An object's resistance to movement, mass and shape.
• What is Newton's First Law of Motion?

  An object stays at rest or constant motion unless a force acts on it.
• What do unbalanced forces do to an object?

  Twist, push, pull, squash, stretch.
• What is Newton's Second Law of Motion?

  Resultant force is proportional to acceleration.
• What is Newton's Third Law of Motion?

  Equal forces in opposite direction.
• Why does acceleration of the rocket increase during the flight?

  Burns fuel, mass decreases so resultant force increases.
• Explain using Newton's laws how a rocket takes off.

  Rocket exerts a force on the exhaust gas, this exerts an equal force on the rocket in the opposite direction.
• Explain how a person falling out through the air reaches terminal velocity.

  Drag=Weight, speed up as they fall, drag increases and equals their weight.
• Explain how opening a parachute can reduce the final velocity of a person so he is at a safe speed to land.

  More surface area so greater air resistance.