GCSE Combined Science (AQA)

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Newton's Second Law Equation

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Forces Forces and motion

Newton's Second Law Equation

4:52 Newton's Three Laws
Spec 4.5.6.2.2
Previous Velocity-Time Graphs Next Velocity
  • Newton's second law can be expressed as an equation.
  • The acceleration of an object is proportional to the resultant force acting on it.
  • Doubling the resultant force doubles the acceleration.
  • Acceleration is inversely proportional to the mass of the object.
  • Doubling the mass halves the acceleration.
  • Acceleration is proportional to the resultant force divided by the mass.
  • The resultant force equals mass multiplied by acceleration (F = M * A).
  • F = M * A is a crucial equation related to forces.
  • Mass is measured in kilograms, acceleration in meters per second squared, and force in Newtons.
  • One Newton is defined as the force that gives a one-kilogram object an acceleration of one meter per second squared.
  • Example problem: Calculate the acceleration of a 7,500 kg tractor with a 5,000 Newton driving force and a 2,000 Newton frictional force.
  • Step 1: Write out key information and check units.
  • Step 2: Calculate the resultant force (5,000 N - 2,000 N = 3,000 N).
  • Step 3: Rearrange the equation to make acceleration the subject (acceleration = resultant force / mass).
  • Step 4: Substitute values to find acceleration (3,000 N / 7,500 kg = 0.4 m/s��).

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