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Sem A Unit 8
Physical Science 9
Term | Definition |
---|---|
closed system | an event or action that has no transfer of energy into or out of it |
direction | which way the vector goes |
force | push or pull of an object that causes a change in its velocity |
magnitude | size and number value |
momentum | the product of an object’s mass and velocity |
scalar | a value without direction |
time | duration |
vector | a quantity that has both magnitude and direction |
inertia | resistance that objects have to change in velocity |
momentum | product of the mass of a particle and its velocity |
net external force | the vector sum of all the forces acting on a system |
Newton's First Law | a body at rest or moving at a constant speed in a straight line will remain at rest or keep moving in a straight line at constant speed unless it is acted upon by a force |
system | a regularly interacting or interdependent group of objects |
conservation of momentum | the total momentum in a closed system is constant |
momentum | product of the mass of a particle and its velocity |
net force | total force |
zero net force | a condition in which momentum is conserved and all forces within the system cancel each other out |
newton’s second law | force is equal to mass times acceleration |
acceleration | rate of change in velocity |