Newtons laws

• What is Newton's first law of motion?

  A body will remain stationary or move at a constant speed and direction unless a resultant force acts on it.
• What are the types of contact forces?

  • Friction
  • Tension
  • Thrust
  • Lift
  • Upthrust
  • Air resistance
  • Push & reaction
• What are the types of non-contact forces?

  • Magnetic
  • Weight
  • Static
  • Gravity (gravitational force)
• What is a contact force?

  A contact force occurs when objects are physically touching each other.
• What is a non-contact force?

  A non-contact force occurs when objects are not physically touching each other.
• How is resultant force measured?

  Resultant force is measured in Newtons (N).
• What is the resultant force when two forces of 2N act in opposite directions?

  The resultant force is 0N.
• What happens to an object when the resultant force is 2N to the right?

  The object will move to the right.
• If an object is already moving, what will happen if a resultant force acts on it?

  It will maintain a constant speed if the resultant force is zero.
• What happens if the resultant force is 2N and there are two forces of 2N and 4N acting in the same direction?

  The object will decelerate and move in the same direction as the larger force.
• What does Newton's second law state about acceleration?

  Acceleration of an object is proportional to the resultant force acting on it.
• What is the formula for Newton's second law?

  F = ma
• What do the symbols in the equation F = ma represent?

  F is resultant force in Newtons, m is mass in kilograms, and a is acceleration in meters per second squared.
• What is inertia?

  Inertia is the resistance of an object to a change in velocity.
• How does mass affect inertia?

  The greater the mass, the greater the resistance to a change in velocity.
• Does an object's mass change if the gravitational field strength changes?

  No, an object's mass does not change if the gravitational field strength changes.
• What does Newton's third law state?

  If object A exerts a force on object B, then object B exerts an equal but opposite force on object A.
• What are examples of Newton's third law?

  • Pushing against a wall: the wall pushes back with equal force.
  • Swimming: pushing against water with arms and legs propels you forward.
• what is Newton's third law closely related to

  Newton's third law is closely related to the laws of conservation of momentum.