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Phys science chap 5
BJU 9th physical science terms chapter 5
| Question | Answer |
|---|---|
| a push or pull on a system | force |
| The SI unit of force | Newton |
| The force that holds protons and neutrons together in nuclei; the strongest of all fundamental forces | Strong Nuclear Force |
| The attractive or repulsive force produced by static and moving charges in atoms | electromagnetic force |
| the force exerted by all matter; the weakest of all fundamental forces | gravitational force |
| a force that acts between systems only when one system touches another | contact force |
| the mathematical description of a field force existing in the space surrounding an object that is the source of or is susceptible to the field force | field |
| a noncontact force exerted on a susceptible object | field force |
| a force that in combination with other forces acting on the same system produces a ZERO net force on the system | balanced force |
| the sum of all forces acting on a system. If the forces are balanced this is zero. | net force |
| a force that produces a change in motion because the sums of the forces is not zero | unbalanced force |
| the tendency of all matter to resist change in motion | inertia |
| Newton's first law of motion that states that objects at rest remain at rest and objects in motion continue in a straight line at a constant velocity unless acted upon by a net force | Law of Inertia |
| Newton's second law stating that the acceleration of a system is directly proportional to the net force acting on the system and is inversely proportional to the system's mass. F=ma | Law of Accelerated Motion |
| Law stating that for every action there is an equal and opposite reaction | Action-Reaction Principle |
| a contact force that opposes motion. It affects both moving and non-moving objects. | friction |
| The force exerted by a supporting surface on an object resting on it. It is perpendicular to the supporting surface. | normal force |
| a constant acceleration, such as that of an object in free fall | uniform acceleration |
| The maximum constant speed of an object falling in the atmosphere. It occurs when drag balances the force of gravity. | terminal velocity |
| A property of a moving object directly proportional to its mass and speed. | momentum |
| p=mV | linear momentum |
| Contact forces are also called | mechanical forces |
| The contact force where two things are pushed together | compression |
| The contact force where two things are pulled apart | tension |
| The contact forces where things are twisted | torsion |
| The contact forces where things slide in opposite directions away from each other | shear |
| Forces that cause things to move without touching them | field forces |
| Field forces get weaker or stronger as you move away from the source? | weaker |
| The field force the everything exerts but it is only noticeable with big objects like planets. | gravity |
| The field force that surrounds magnets and materials with electricity flowing through them. | magnetic |
| The field force that surrounds and affects electrical charges. | electricity |
| Balanced forces are pushes and pulls that do this. | cancel each other out |
| This means you have balanced forces. | zero net force |
| Acts on a system from outside the system's boundary | external force |
| When one force is greater than the other you have this. | unbalanced force |
| The difference between two forces. | net force |
| The gravitational attraction exerted on an object's mass. | weight |
| weight is | mass being pulled down by gravity |
| Formula for Newton's Law of accelerated motion | F = m*a. Force = mass * acceleration |
| What makes the biggest change in the amount of gravity between two objects? | Distance |
| When objects fall due to gravity alone with no other force acting on them. | Free fall |
| This can slow an object down during free fall | air resistance |
| The formula for weight | W = mass * gravity. W = m*g |
| Acceleration at a constant rate | uniform acceleration |
| Air resistance is friction from air molecules and can be called | drag |
| Force is scalar or vector? | vector |
Created by:
kdcribb
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