Newton's law of motion

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

  Forces are equal and opposite.
• What does the "equal" part of Newton's third law refer to?

  The magnitude of the two forces.
• What does the "opposite" part of Newton's third law refer 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 in the opposite direction.
• What is the normal contact force?

  The force the box exerts back on you.
• What determines which object moves when two objects interact?

  The mass of the objects and the force applied.
• What happens if you push a small box?

  The box is likely to move.
• What happens if you push a large box?

  The box is unlikely to move.
• What is an example of pushing off a wall?

  You move while pushing against the wall.
• What happens when you push a medium-sized box?

  You might move backwards a little.
• What does Newton's second law equation \( F = ma \) represent?

  Force equals mass times acceleration.
• How can you rearrange \( F = ma \) to find acceleration?

  Acceleration equals force divided by mass.
• What is required for an object to be accelerated?

  A high force or a small mass.
• What generally happens to smaller objects when a force is applied?

  They will generally move most.
• What are the key concepts of Newton's third law?

  • Forces between two objects are equal and opposite.
  • Magnitude refers to the strength of forces.
  • Direction refers to the way forces act.
  • Normal contact force is the force exerted back.
• How does mass affect movement when forces are applied?

  • Smaller mass: more likely to move.
  • Larger mass: less likely to move.
  • Medium mass: may result in partial movement for both.
• What is the relationship between force, mass, and acceleration?

  • \( F = ma \) describes the relationship.
  • Acceleration is affected by force and mass.
  • High force or low mass leads to greater acceleration.
• What are the two laws of motion discussed in the video?

  Newton's first and second laws
• What does Newton's first law state about resultant force?

  A resultant force is needed to change motion
• What happens to a stationary object if the resultant force is zero?

  The object remains stationary
• What occurs if the resultant force on a moving object is zero?

  The object continues moving at the same velocity
• What does Newton's second law state about non-zero resultant force?

  It causes the object to accelerate
• If a particle has unbalanced forces acting on it, what direction will it accelerate?

  In the direction of the resultant force
• What can happen to an object when it accelerates to the right?

  It can start moving, speed up, or slow down
• How does acceleration relate to velocity and time?

  Acceleration is change in velocity over time
• Why is the moon considered to be accelerating even at constant speed?

  Its direction is constantly changing
• What force acts on the moon to keep it in orbit?

  The Earth's gravitational pull
• What does the equation $F =$$ma$ represent?


  Resultant force equals mass times acceleration
• If a particle has a mass of $0.25 \text{ kg}$ and experiences a resultant force of $12 \text{ N}$, what is its acceleration?


  $48 \text{ m/s}^2$
• What is inertia?

  The tendency of an object to maintain motion
• How is inertial mass defined?

  It measures difficulty in changing velocity
• How do you calculate inertial mass?

  By dividing force by acceleration
• What does a large mass indicate about inertia?

  It requires a large force to change velocity
• What happens to an object's motion if no resultant force acts on it?

  Its motion remains unchanged