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an act, process, or instance of changing place : movement a pendulum in motionb : an active or functioning state or condition set the divorce proceedings in motion. 2 : an impulse or inclination of the mind or will the fundamental motions of humanity to good or evil

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The definition of force is strength or power. An example of force is someone using their hand to push open a door. An example of force is a police man pointing a gun at an armed person in order to get them to drop their weapon.

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mass definition. In physics, the property of matter that measures its resistance to acceleration. Roughly, the mass of an object is a measure of the number of atoms in it. The basic unit of measurement for mass is the kilogram. (See Newton's laws of motion; compare weight.)

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The force that attracts a body toward the center of the earth, or toward any other physical body having mass. For most purposes Newton's laws of gravity apply, with minor modifications to take the general theory of relativity into account.

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Inertia is the resistance of any physical object to any change in its state of motion. This includes changes to the object's speed, direction, or state of rest. Inertia is alsodefined as the tendency of objects to keep moving in a straight line at a constant velocity.

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velocity. ... ○○ noun (plural velocities) 1 [countable, uncountable] technical the speed of something that is moving in a particular direction the velocity of light The speedboat reached a velocity of 120 mph. a high velocity bullet2 [uncountable] a high speed Martinez had good velocity on his fastball.

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acceleration definition. A change in the velocity of an object. Note: The most familiar kind of acceleration is a change in the speed of an object. An object that stays at the same speed but changes direction, however, is also being accelerated. (See force.)

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It is measured as the maximum force the bodies will sustain before motion occurs. ... Between two hard surfaces, the kinetic friction is usually somewhat lower than the static friction, meaning that more force is required to set the objects in motion than to keep them in motion.

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A force is a push or a pull that acts upon an object as a results of its interaction with another object. ... These two forces are called action and reaction forces and are the subject of Newton's third law of motion. Formally stated, Newton's third law is: For every action, there is an equal and opposite reaction.

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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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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.