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Physics

Grade 10: Mechanics

TermDefinition
Vector A physical quantity with magnitude and direction.
Scalar A physical quantity with magnitude only.
Resultant vector The single vector having the same effect as two or more vectors together.
One-dimensional motion Motion along a straight line where the object may move forward or backward along this line.
Distance The total path length travelled.
Displacement The difference in position in space.
Average speed The total distance travelled per total time.
Average velocity The rate of change of position.
Acceleration The rate of change of velocity.
Positive acceleration An object moving in the positive direction is experiencing an increase in speed and an object moving in the negative direction is experiencing a decrease in speed.
Negative acceleration An object moving in the positive direction is experiencing a decrease in speed and an object moving in the negative direction is experiencing an increase in speed
Deceleration An object is experiencing a decrease in speed.
Instantaneous velocity The rate of change in position, i.e. the displacement divided by a very small time interval or the velocity at a particular time.
Instantaneous speed The magnitude of the instantaneous velocity.
Gravitational potential energy The energy it has because of its position in the gravitational field relative to some reference point.
Kinetic energy The energy an object possesses as a result of its motion.
Mechanical energy The sum of the gravitational potential energy and kinetic energy.
Law of the conservation of energy The total energy of an isolated system remains constant.
Isolated system A system that does not interact with its surroundings, i.e. there is no transfer of energy or mass between the system and the surroundings.
Principle of conservation of mechanical energy The total mechanical energy in an isolated system/in the absence of dissipative forces, remains constant.
Created by: StiKManLabs
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