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