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Forces and Motion
| Term | Definition |
|---|---|
| Gravity | The force that attracts a body toward the center of the earth, or toward any other physical body having mass. |
| Force | The push or pull on an object with mass causes it to change its velocity. Force is an external agent capable of changing a body's state of rest or motion. It has a magnitude and a direction. |
| Push | A force that causes an object to move away from the person who is applying the force from its state of rest. |
| Pull | A force that changes the direction of an object towards you. |
| Friction | The force that resists motion when the surface of one object comes in contact with the surface of another. |
| Mass | It is the total of all the protons, neutrons, and electrons within an object. |
| Weight | The Gravitational force with which the Earth attracts the masses towards its center. Gravity is related to the resultant force with which a mass is attracted to Earth. |
| Motion | The change in position of an object with respect to its surroundings in a given interval of time. The motion of an object with some mass can be described in terms of the following: Distance. Displacement. |
| Inertia | It states that an object at rest will remain at rest, and an object in motion will remain in motion, unless some outside force starts or stops the object. |
| Speed | A measure of how fast an object is moving. Calculate speed using the speed equation - speed = distance divided by time. The speed equation can be rearranged to find distance traveled and time taken. |
| Position | A place or point where something or someone is located or has been placed in relation to other things. In physics, we discuss the position in relation to an x, y axis. |
| Axis | An invisible line around which an object rotates, or spins. The object can be a tiny particle, smaller than a single atom. Or it could be a star with the mass of a thousand suns. In either case, an object's axis runs through its center of mass. |
| Unbalanced Force | Forces applied to an object in opposite directions that are not equal in size. Unbalanced forces result in a change in motion. friction: the force that opposes the motion or tendency toward motion of two objects that are in contact. |
| Acceleration | The name we give to any process where the velocity changes. Since velocity is a speed and a direction, there are only two ways for you to accelerate: change your speed or change your direction—or change both. |
| Direction | The direction of a vector is given by the counterclockwise rotation of the angle of the vector about its tail due east. |
| Velocity | Velocity is the speed with a direction, while speed does not have a direction. Velocity is a vector quantity -- when giving the velocity we must specify the magnitude (the speed) and the direction of travel. |
| Air Resistance | Is the force acting on an object that is moving through air flowing in the opposite direction. |
| Momentum | Is the quantity that is used to describe the state of motion of an object with a non-zero mass. |
| Resist | Is a measure of the opposition to current flow in an electrical circuit. |
| Deceleration | To move or cause to move at decreasing speed. |
| Newton's First Law | An object at rest remains at rest, and an object in motion remains in motion at constant speed and in a straight line unless acted on by an unbalanced force. |
| Newton's Second law | States that the acceleration of an object is directly related to the net force and inversely related to its mass. Acceleration of an object depends on two things, force and mass. |
| Newton's Third Law | For every action there is an equal and opposite reaction. |
Created by:
Amodi
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