Newton's 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 to a stationary object if the resultant force acting on it 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, so the object remains stationary
• What is the resultant force on an object with no forces acting on it?

  The resultant force is zero
• If an object is moving with no forces acting on it, what will happen to its speed and direction?

  Both the speed and direction will stay the same
• What happens when a resultant force acts on a stationary object?

  The object will accelerate in the direction of the resultant force
• What does a resultant force of 50 Newtons acting to the left do to an object moving at a constant speed?

  It causes the object to decelerate
• How does a resultant force affect an object's speed?

  A resultant force causes an object's speed to change
• What can a resultant force change besides an object's speed?

  It can also change an object's direction
• What happens to an object moving with a constant speed when a resultant force acts on it?

  The object will accelerate or decelerate depending on the direction of the force
• What is the driving force of a car moving at a constant speed?

  The engine's driving force
• What are resistive forces in the context of a moving car?

  Friction with the air and friction with the road
• What is the key fact about the velocity of an object according to Newton's first law?

  • The velocity of an object will only change if a resultant force is acting on the object.