Ontario Grade 9 Science Class Practice Exam 2025 – Your Complete Guide to Exam Success!

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What does Newton's first law of motion state?

An object will only move when a force is applied

An object in motion stays in motion unless acted upon

Newton's first law of motion, often referred to as the law of inertia, asserts that an object at rest will remain at rest, and an object in motion will continue to move at a constant velocity in a straight line unless acted upon by a net external force. This principle underscores the concept of inertia, which is the tendency of objects to resist changes in their state of motion.

When we consider this law, it becomes clear that objects do not spontaneously change their state of motion without a significant influence, such as the application of force. For instance, a rolling ball will continue to roll indefinitely unless friction, a wall, or another force stops it or changes its direction. This understanding is critical in explaining everyday phenomena as well as in various fields of science and engineering, where knowing how forces interact with motion is fundamental.

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For every action, there is an equal and opposite reaction

An object moves in a circular motion at constant speed

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