Newton's first and second law

• Who formulated the Laws of Motion?

  Sir Isaac Newton
• 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?

  It continues moving at the same velocity
• What must be balanced for a vehicle to move at constant velocity?

  The resistive and driving forces must balance
• What does a non-zero resultant force produce?

  Acceleration or deceleration in the direction of the force
• What are the four forms of acceleration mentioned?

  Starting, stopping, speeding up, slowing down
• How are the arrows represented on a free body diagram when there is a non-zero resultant force?

  The arrows will be unequal
• How does acceleration relate to resultant force?

  Acceleration is proportional to the resultant force
• What happens to acceleration if the mass of an object increases?

  It accelerates less for a fixed force
• What is the formula for Newton's Second Law?

  F = ma
• What does Newton's Second Law help estimate in everyday transport?

  The forces involved in transport
• How do you estimate the resultant force on a car accelerating from rest?

  Use F = ma with acceleration and mass
• What does Newton's second law summarize?

  F = ma
• What should you ensure before moving on to Newton's third law?

  Understand both Newton's first and second laws
• What is the force needed for an 80 kg man on a 10 kg bike to accelerate at $0.25 \text{ m/s}^2$?


  Use F = ma for calculation