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1 Ch - Phy Sc M 7B

Physics - Forces (Apologia Physical Science M 7B) -

QuestionAnswer
electromagnetic force the only universal force that can repel and attract
strong nuclear force the universal force that acts to hold the nucleus together; the strongest of the 4 universal forces, about 100x stronger than the repulsive electromagnetic force
gravitational force weakest of the 4 universal forces; still not fully understood by scientists
Law of Inertia Newton's 1st law
Newton's 1st Law states: An object in motion (or at rest) will stay in motion (or at rest) until it is acted upon by an outside force.
Newton's 2nd Law states: When an object is acted on by one or more unbalanced forces, the net force is equal to the mass of the object times the resulting acceleration.
The magnitude of acceleration depends on both the magnitude of the force and the _________ of the object. mass
Frictional force will always act ________________ motion. opposite
Newton's 3rd Law states: For every action, there is an equal and opposite reaction.
weak nuclear force governs certain radioactive processes in atoms in which one type of quark changes into another type of quark; plays a role in particles breaking down or decaying
quark subatomic particle scientists theorize to be among the basic units of matter - ones that cannot be split into smaller parts
Gravitational force is __________________ proportional to mass. directly
Gravitational force is __________________ proportional to the SQUARE of the distance between objects. inversely
General Theory of Relativity proposed by Einstein in 1916; attempts to explain a different way of looking at physics
General Theory of Relativity states that space is not always the way it appears to us and that mass bends space.
net force the sum of all forces affecting an object
mass the amount of an object, the measure of an object's inertia
weight the force of gravity acting on an object
Weight often does not include a written direction because it is __________________. implied
When a hammer exerts a force on a nail, the nail also exerts an equal and opposite force on the hammer.
Electric forces act between charge particles or objects (whether they're moving or not).
Magnetic force acts between moving charged particles and on the poles of magnets.
Newton's universal law of gravitation states that every object in the universe attracts every other object; it allows physicists to calculate the strength of the gravitational force between two objects.
quantum gravity attempts to explain gravity at the smallest scale (called quantum mechanics)
Created by: MrsHough
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