newtons second law of motion

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

  Newton's second law of motion
• What does Newton's second law of motion state?

  Acceleration is proportional to resultant force
• How do you calculate the force required to accelerate an object?

  Force = mass × acceleration
• What is the relationship between force and acceleration for equal masses?

  Greater force results in greater acceleration
• What happens to acceleration if mass increases?

  Acceleration decreases with larger mass
• What is the force required to accelerate a 5 kg object by $4 \text{ m/s}^2$?


  20 Newtons
• How do you calculate acceleration from force and mass?

  Acceleration = force / mass
• What is the acceleration of an object with a force of 50 Newtons and mass of 0.5 kg?

  100 meters per second squared
• What is the typical speed of cars on a main road in the UK?

  13 meters per second
• What is the typical speed of cars on a motorway?

  30 meters per second
• What is the typical acceleration when transitioning from a main road to a motorway?

  2 meters per second squared
• What force is required for a typical family car to accelerate?

  2,000 Newtons
• What does inertia refer to in Newton's first law?

  Objects resist changes in their motion
• How is inertial mass defined?

  Ratio of force needed to acceleration
• What does a large inertial mass require?

  Larger force to produce given acceleration
• What are the key concepts of Newton's second law of motion?

  • Acceleration is proportional to resultant force
  • Acceleration is inversely proportional to mass
  • Force = mass × acceleration
• What are the typical speeds and forces in road transport?

  • Main road speed: 13 m/s
  • Motorway speed: 30 m/s
  • Typical acceleration: 2 m/s²
  • Force for family car: 2,000 N
• How does inertia relate to Newton's first law?

  • Objects remain stationary or in motion
  • Change in motion requires resultant force
  • Inertia is the resistance to change in motion
• What is the significance of inertial mass?

  • Measures difficulty in changing velocity
  • Defined as force needed over acceleration produced
  • Larger inertial mass requires larger force for acceleration