Newton’s First Law

• How can you apply Newton's first law?

  To moving and stationary objects
• What do Newton's Laws of Motion describe?

  The effects of forces on motion
• How many laws of motion are there?

  Three laws of motion
• What happens if the resultant force on a stationary object 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 a balanced force on a stationary object indicate?

  The resultant force is zero
• What does it mean for an object to have no resultant force acting on it?

  Both speed and direction stay the same
• What happens to an object moving with no forces acting on it?

  It continues to move with the same velocity
• What is the key fact about an object's velocity?

  It changes only if a resultant force acts
• What must be true if a car is moving at a constant speed?

  An equal force acts in the opposite direction
• What are resistive forces?

  Friction with air and road
• What does a resultant force of 50 Newtons to the right cause?

  The object to accelerate to the right
• What happens when a resultant force causes an object to decelerate?

  The object slows down
• How can a resultant force change an object's direction?

  By acting on the object at an angle
• What does a resultant force acting upwards do to an object moving at constant speed?

  It causes the object to accelerate upwards
• What are the key points of Newton's first law of motion?

  • An object remains stationary if no resultant force acts.
  • A moving object continues at the same velocity if no resultant force acts.
  • A resultant force changes an object's speed or direction.
• What are the effects of a resultant force on an object?

  • Causes acceleration or deceleration
  • Changes the object's direction
  • Alters the object's speed