Physics Newton's laws

• What are balanced forces?

  An object with a resultant force of zero
• What is contact force?

  A force that acts on an object through physical contact.
• What is Inertia?

  An object’s tendency to continue moving at a constant velocity unless acted on by a resultant force.
• What is inertial mass?

  The measure of an object's resistance to changes in its motion.
• What is a newton meter?

  A device used to measure the magnitude of a force. It is commonly used to measure an object’s weight.
• What is a Newton?

  Unit of force
• What is Newton's first law?

  If a stationary object’s resultant force is zero, the object will remain stationary. If a moving object’s resultant force is zero, the object will continue to move at a constant velocity (same speed and direction).
• What is Newton's Second law?

  An object’s acceleration is directly proportional to the resultant force acting on it, and inversely proportional to the object’s mass.
• What is Newton's third law?

  The forces that two objects exert on each other when they interact are equal and opposite.
• What is the resultant force?


  The resultant force is the vector sum of all the forces acting on an object.
• What is terminal speed?

  The maximum speed an object can reach when falling through a fluid. It occurs when the resistive forces equal the object’s weight.
• What is Weight?


  The force acting on an object due to gravity. It is equal to the product of the object’s mass and the gravitational field strength at its location.
• State Newton's first law of motion for a stationary object


  If the resultant force on a stationary object is zero, the object will remain at rest.
• State Newton’s first law for a moving object.

  If the resultant force on a moving object is zero, the object will remain at constant velocity (same speed in same direction).
• What is the gravitational field strength on the surface of Earth?

  10 N/Kg
• When does a falling object reach terminal velocity?

  When the upward forces and the downward forces are equal to each other. No resultant force, so constant speed.