The first of Sir Isaac Newton’s three laws of motion, Newton’s first law says “An object at rest tends to stay at rest and an object in motion tends to stay in motion.”
Newton’s first law of motion tells us that objects tend to keep moving how they are already moving. If an object is at rest (not moving), it stays at rest. If an object is moving, it keeps moving.
Learn more about Newton’s first law in the following Whybricks activities:
Students are introduced to Newton’s three laws of motion – Newton’s first law of motion (inertia), Newton’s second law of motion (F=ma) and Newton’s third law of motion (for every action, there is an equal and opposite reaction).