Newtons 1st law

• What should you be able to describe by the end of the video?

  Newton's first law of motion
• 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 it mean for an object to have the same velocity?

  It moves in the same direction at the same speed
• What is shown when a stationary object has no forces acting on it?

  The resultant force is zero
• What happens when two equal forces act on a stationary object?

  The object remains stationary
• What does it indicate when an object is moving with no forces acting on it?

  Both speed and direction stay the same
• What happens when balanced forces act on a moving object?

  The object's speed and direction remain unchanged
• 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?

  There must be equal resistive forces
• What does a resultant force cause an object to do?

  Change its speed or direction
• What are resistive forces?

  Friction with air and road
• What happens when a resultant force acts on a stationary object?

  The object accelerates in the direction of the force
• What occurs when a resultant force acts on an object moving at constant speed?

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

  By acting on the object at an angle
• What is the effect of a resultant force acting upwards on a moving object?

  The object accelerates upwards
• What are the key points of Newton's first law of motion?

  • An object at rest stays at rest unless acted upon
  • An object in motion stays in motion unless acted upon
  • Resultant force must be non-zero to change motion
• What are the effects of a resultant force on an object?

  • Causes acceleration or deceleration
  • Changes speed or direction of motion
  • Can act on stationary or moving objects