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The focus of Lesson 1 is Newton's first law of motion - sometimes referred to as the law of inertia. An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.

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Newton's second law of motion can be formally stated as follows: The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object.

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Formally stated, Newton's third law is: For every action, there is an equal and opposite reaction. The statement means that in every interaction, there is a pair of forces acting on the two interacting objects. The size of the forces on the first object equals the size of the force on the second object.

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the resistance that one surface or object encounters when moving over another.

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a vehicle's capacity to gain speed within a short time.

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Velocity is an American high-definition, commercial-based, cable and satellite television network owned by Discovery Communications.

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a tendency to do nothing or to remain unchanged.

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Dr. Ryan Stone (Sandra Bullock) is a medical engineer on her first shuttle mission. Her commander is veteran astronaut Matt Kowalsky (George Clooney), helming his last flight before retirement. Then, during a routine space walk by the pair, disaster strikes: The shuttle is destroyed, leaving Ryan an…

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the action or process of moving or being moved.

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In physics, mass is a property of a physical body. It is the measure of an object's resistance to acceleration when a net force is applied. It also determines the strength of its mutual gravitational attraction to other bodies.

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In physics, a force is any interaction that, when unopposed, will change the motion of an object. A force can cause an object with mass to change its velocity, i.e., to accelerate. Force can also be described intuitively as a push or a pull.