first 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 that forces have on the motion of an object
• How many laws of motion are there according to Newton?

  Three laws of motion
• What happens if the resultant force acting on a stationary object is zero?

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

  The object will continue moving in the same direction at the same speed
• What does it mean for forces to be balanced on a stationary object?

  The resultant force is zero
• What is shown when a stationary object has no forces acting on it?

  The object will remain stationary
• What happens when a 50 Newton force acts to the right and a 50 Newton force acts to the left on a stationary object?

  The forces are balanced, and the resultant force is zero
• What happens to an object moving with no forces acting on it?

  Both the speed and direction of the object will stay the same
• What does a balanced force of 50 Newtons acting to the right and left on a moving object indicate?

  The resultant force is zero, so the object continues to move at the same velocity
• What is the key fact regarding the velocity of an object?

  The velocity of an object will only change if a resultant force is acting on it
• What is the constant speed of the car mentioned in the video?

  15 m/s
• What must be true if a car is moving at a constant speed?

  There must be an equal force acting in the opposite direction
• What are the resistive forces acting on the car?

  Friction with the air and friction with the road
• What happens when a resultant force of 50 Newtons acts on a stationary object?

  The object accelerates to the right
• What does a resultant force of 50 Newtons acting to the left do to an object moving at a constant speed?

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

  By acting on the object while it moves with a constant speed
• What does a resultant force acting upwards do to an object moving with a constant speed?

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

  • An object at rest stays at rest unless acted upon by a resultant force.
  • An object in motion continues in motion at the same speed and direction unless acted upon by a resultant force.
• What are the effects of a resultant force on an object?

  • Causes an object's speed to change.
  • Can change an object's direction.