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The inertia of an object tends to cause the objects :

  • A.To increase the speed
  • B.To decrease the speed
  • C.To resist any change in the state of motion
  • D.To decelerate due to friction

Answer: C

Inertia causes an object to resist any change in the state of motion.

Inertia is the property expressed in Newton's first law: a body stays at rest or keeps moving at constant velocity unless an external force acts on it. It resists starting, stopping and changing direction alike, and the greater the mass, the greater the inertia.

Inertia does not by itself increase or decrease speed; each of those is a change of motion that requires a force. Slowing down because of friction is the effect of an external force, not of inertia.

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