Newton's Laws

• How does weight vary on different planets?

  Weight changes due to different gravitational accelerations
• Why do small objects appear weightless in space?

  Because the gravitational field strength is weak
• What are inertial forces?

  Forces that resist changes in motion
• How does mass affect inertia?

  Greater mass results in greater inertia
• What is Newton's First Law of Motion?

  An object remains at rest or in uniform motion unless acted upon by external force
• What happens when forces are balanced according to Newton's First Law?

  The motion of an object remains unaffected
• What is Newton's Second Law of Motion?

  Resultant force = mass × acceleration
• What does the equation F = ma represent?

  Resultant force equals mass times acceleration
• What is Newton's Third Law of Motion?

  IF a body A exerts a force on body B then body B exerts an equal and opposite force on body A
• What is terminal velocity?

  Constant speed when drag equals driving force
• How does mass affect terminal velocity for a skydiver?

  Greater mass leads to greater terminal velocity
• What happens when a skydiver opens their parachute?

  Drag forces increase, slowing the diver down
• What are the key points of Newton's Laws of Motion?

  • First Law: Objects remain at rest or in uniform motion unless acted upon.
  • Second Law: Resultant force causes a change in velocity (F = ma).
  • Third Law: For every action, there is an equal and opposite reaction.

  
• What are the stages of a skydiver's journey?

  1. Driving forces increase.
  2. Resistance forces increase as a reaction.
  3. Terminal velocity is achieved when forces balance.
  4. Opening parachute increases drag, slowing down.
  5. Diver lands safely.

  
• How does a rocket take off

  Rocket pushes exhaust gases down - the exhaust gases push the rocket up
• What happens to a rockets acceleration

  Acceleration increases as it goes up because its weight decreases which increases resultant forces