Example of Inertia of rest

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The Law of Inertia States Objects at Rest Tend to Stay at Rest

One of the fundamental principles of physics is the law of inertia, also known as Newton’s first law of motion. This law states that objects at rest tend to stay at rest, unless acted upon by an external force. The resistance of an object to changes in its state of motion is called inertia. Inertia is directly related to an object’s mass – the more massive an object is, the more inertia it has. Inertia of rest refers to a stationary object’s tendency to remain at rest.

A Practical Example of Inertia of Rest

A simple example from everyday life that demonstrates inertia of rest is a car parked at the side of the road. When the car is stationary with the brakes engaged, it exhibits inertia and resists change from its resting state. This means it requires the application of an external force to get the parked car moving.

Let’s break this down step-by-step:

• The car is stationary and at rest while parked with the engine off. It has no inherent force acting on it. This is inertia of rest.
• To move the parked car, the driver must start the engine. This provides an external force.
• When placing the car into ‘drive’ mode, the transmission transfers engine power to the wheels. But the stationary car still resists motion.
• The driver must press the accelerator which increases engine power. The tires initially resist motion due to static friction on the road surface.
• With sufficient engine force, the static friction is overcome and the tires begin rolling. The car starts moving from rest.
• Once in motion, the rolling tires have less resistance due to kinetic friction being less than static friction.

In summary, the stationary car at rest resisted changing its state of motion until an external force from the engine overcame the inertia. This real-world example of Inertia of rest clearly illustrates the physics principle of inertia of rest.