Newtons laws (physics)

• What are Newton's Laws of Motion?


  Three fundamental principles that describe the behavior of objects when forces act upon them
• Who formulated the Laws of Motion?

  Sir Isaac Newton
• What do Newton's Laws of Motion explain about objects?

  They describe the relationship between an object and the forces acting upon it
• What does Newton's First Law of Motion state?

  An object will remain at rest or in uniform motion unless acted upon by an external force
• What is another name for Newton's First Law of Motion?

  The law of inertia
• What happens to an object at rest according to Newton's First Law?


  It stays at rest unless acted upon by an external force
• What happens to an object in motion according to Newton's First Law?


  It stays in motion unless acted upon by an external force
• What is inertia?


  The property of an object to resist changes in its motion
• Why does a book on a table stay there unless pushed?

  Because of inertia, it remains at rest until acted upon by an external force
• Why do you move forward in your seat when a car suddenly stops?

  Your body wants to keep moving forward due to inertia
• What happens to a backpack when you suddenly stop walking?

  The backpack continues to move forward slightly due to inertia
• What does Newton's Second Law of Motion state?

  The acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass
• What does more force lead to according to Newton's Second Law?


  More acceleration
• How is Newton's Second Law often expressed mathematically?


  As the equation $F =$$ma$
• What does more mass lead to according to Newton's Second Law?

  Less acceleration
• Why is it easier to push an empty shopping cart than a full one?

  Because the empty cart has less mass, leading to more acceleration with the same force
• If you push a toy car twice as hard as another, what will happen?


  It will accelerate twice as fast
• What are the key points of Newton's Laws of Motion?


  • There are three laws
  • They describe the relationship between an object and the forces acting upon it
  • They explain how objects move in response to forces
  • Developed by Sir Isaac Newton
• What are the key points of Newton's First Law of Motion?

  • Objects at rest stay at rest
  • Objects in motion stay in motion
  • Only an external force can change an object's motion
  • This property is called inertia
• What are the key points of Newton's Second Law of Motion?


  • Acceleration is directly proportional to net force
  • Acceleration is inversely proportional to mass
  • Expressed as $F =$$ma$
  • More force leads to more acceleration
  • More mass leads to less acceleration
• What happens when you kick a normal football?


  It goes pretty far.
• How does kicking a football filled with sand differ from kicking a normal football?


  A football filled with sand doesn't go as far as a normal football.
• What happens if you kick a normal football really hard compared to a soft kick?


  It goes further with a hard kick than with a soft kick.
• What does Newton's Second Law state about acceleration?


  • Acceleration depends on:

  1. The force applied (how hard you push or kick)
  2. The mass of the object (how heavy it is)
• How does mass affect acceleration according to Newton's Second Law?


  More weight (mass) makes things harder to speed up.
• What is the relationship between force and acceleration according to Newton's Second Law?


  More force makes things speed up more.
• How can we visualize the relationship between force and mass in Newton's Second Law?


  • It's like a see-saw:
  • Force on one side
  • Mass on the other
  • The balance determines acceleration
• What does Newton's Third Law of Motion state?


  For every action, there is an equal and opposite reaction.
• What are the key points of Newton's Third Law?


  Forces always come in pairs, are equal in magnitude, act in opposite directions, and act on different objects.
• What happens when you jump off a boat according to Newton's Third Law?


  You push the boat backwards as you move forwards.
• How does pushing against a wall while on a skateboard illustrate Newton's Third Law?


  When you push the wall, you move backwards on the skateboard.
• What explains the feeling of falling forward when suddenly braking a bicycle?

  This is explained by Newton's First Law, as your body wants to continue moving forward (inertia).
• What happens to a balloon when you let it go according to Newton's Third Law?

  The air rushes out in one direction, propelling the balloon in the opposite direction.
• How does Newton's Second Law apply to rockets as they burn fuel?

  Rockets accelerate faster as their mass decreases while the force remains constant.
• What does Newton's First Law explain about seatbelts in cars?


  Seatbelts protect us because when a car stops suddenly, our body wants to keep moving forward.
• How can Newton's Laws of Motion be applied to real-world scenarios?

  1. **First Law**: Seatbelts protect us due to inertia.
  2. **Second Law**: Rockets accelerate faster as they burn fuel.
  3. **Third Law**: A balloon flies when air rushes out.
• What happens when you jump on a trampoline according to Newton's Third Law?


  You push down on the trampoline, and it pushes you back up.
• The SI unit of energy is the joule (J).
• Work done = force x distance moved in direction of force