Grade 9 reading comprehension worksheet on Newton's Laws of Motion, including definitions and examples.

['Isaac Newton was a seventeenth-century scientist who described how things move in the physical universe.', 'We call these descriptions Newton’s Laws of Motion because they apply in the same way at all times for all objects on Earth.', 'Newton’s laws center around a few key concepts.', 'Force is something that pushes or pulls an object.', 'Force can move, stop, speed up, or slow down an object.', 'It can also change its shape.', 'The world is full of forces, and every object acts on all objects.', 'The most ubiquitous force on Earth is gravity, which is a force which pulls objects towards themselves.', 'Earth’s gravitational force is what keeps objects on earth touching the ground.', 'Another key concept, direction, refers to how an object moves when a force is applied to it.', 'Strength refers to how a force is exerted.', 'The stronger the force, the farther an object will move.', 'Acceleration refers to a change in velocity.', 'Velocity is a combination of speed and direction.', 'When acceleration and velocity are going in the same direction, an object speeds up.', 'When acceleration and velocity are opposed, an object slows down.', "Newton's First Law of Motion is also known as the Law of Inertia.", "Inertia is resistance to a change in motion.", "Newton's first law says that an object that is not moving (at rest) tends to stay at rest, and an object in motion tends to stay in motion.", "Newton's Second Law of Motion says that the greater an object's mass, the more force is needed to accelerate it.", "Newton's Third Law of Motion says that for every force acting on an object (called an action), there is an equal and opposite reaction."]