59 True/False questions

True → Action and reaction are always opposite, equal, and along the same ___.

Motion → term for the time required for any planet to complete one orbit about the sun

Newton's first law of motion → law that states that every action has an opposite and equal reaction

gravitational force → Scientist have sought to remove the mystery from gravitation by imagining that each object sets up a _____ ____ in which other objects are impelled to move by a force in the object's surrounding space.

kinetic friction → term for the force that acts against every object in motion in the opposite direction to slow it down, or the resistance arising when an object moves through a medium or across a surface

heliocentric → The _____ ("suncentered") model of the solar system has become the foundation of modern astronomy.

geocentric → The _____ ("suncentered") model of the solar system has become the foundation of modern astronomy.

weight → term for the force exerted on an object's mass by the earth's gravity

minimizing roughness; choosing suitable materials; lubricating; and rollers and bearings → four methods of reducing friction on a surface

friction → ____ is caused by unbalanced forces acting on the same object.

gravitational field strength → Scientist have sought to remove the mystery from gravitation by imagining that each object sets up a _____ ____ in which other objects are impelled to move by a force in the object's surrounding space.

unstable equilibrium → An object in ____ _____ is upset at the slightest disturbance.

weight → Action and reaction are always opposite, equal, and along the same ___.

Newton's third law of motion → the law that states that a body in motion tends to move in a straight line at a constant speed, and a body at rest tends to stay at rest, unless acted upon by an outside force

universal law of gravitation → law that states that the same kind of force exists between any two masses, regardless of size; specifically, that they are mutually attracted by a force governed by the proportionality

static friction and kinetic friction → two types of friction

gravitation → term for the attractive force that exists between any two masses

stable equilibrium → An object in ____ _____ is upset at the slightest disturbance.

instability → term for the state in which an object's center of gravity is unsupported, and the point where the force of gravity is effectively applied is free to move in the direction of the applied force

law of orbits → law that states that the orbit of every planet has the shape of an ellipse and that the two foci of each planetary orbit are relatively close together

False → True or False: Kinetic friction is dependent on velocity.

law of areas → law that states that the orbit of every planet has the shape of an ellipse and that the two foci of each planetary orbit are relatively close together

aphelion → term for the time required for any planet to complete one orbit about the sun

multiple suspensions → law that says that for any planet, the square of the period of revolution is proportional to the cube of the average distance from the sun

center of mass → term for rest mass

gravity → term for any part of a machine that supports a moving part

strong force, electromagnetic force, weak force, and gravitational force → the four fundamental forces of nature (from strongest to weakest)

normal force → the fundamental force responsible for certain particle interactions in the radioactive decay of atomic nuclei

line → Action and reaction are always opposite, equal, and along the same ___.

Fw = mg → equation for weight

gravitational field → Scientist have sought to remove the mystery from gravitation by imagining that each object sets up a _____ ____ in which other objects are impelled to move by a force in the object's surrounding space.

Nicolaus Copernicus → sixteenth century Polish astronomer who proposed that sun was the center of the solar system

center of gravity (CG) → term for the one spot that represents the combined effect of gravity's influence on all the particles in an object

strong force → the fundamental force responsible for certain particle interactions in the radioactive decay of atomic nuclei

inertial mass → term for rest mass

bearing → term for any part of a machine that supports a moving part

neutral equilibrium → An object in ____ _____ can be overturned without changing the height of its center of gravity.

inertia → term for the science of mechanics that seeks merely to describe motion by describing its causes

dynamics → Forces always occur in actionreaction ____.

Principia Mathematica → term for the science of mechanics that seeks merely to describe motion by describing its causes

False → True or False: Kinetic friction is dependent on the area of contact between the surfaces.

law of periods → law that says that as a planet gets farther away from the sun, the distance traveled by the planet must shorten and the velocity must decrease

kinematics → term for the science of mechanics that seeks merely to describe motion by describing its causes

F = ma → equation for weight

weak force → the fundamental force responsible for certain particle interactions in the radioactive decay of atomic nuclei

pairs → term for the time required for any planet to complete one orbit about the sun

True → True or False: 'Gravitation' and 'gravity' do not mean the same thing.

straight line, speed → A body in motion tends to move in a ____ ___ at a constant ____.

electromagnetic force and weak force → two fundamental forces that might be basically different expressions of the same force

perpendicular → term for the time required for any planet to complete one orbit about the sun

force → True or False: Kinetic friction is dependent on the area of contact between the surfaces.

Ptolemy → True or False: Rough surfaces produce more friction than smooth surfaces.

static equilibrium → An object that remains at rest within earth's gravitational field is said to be in ____ _______.

force → True or False: Rough surfaces produce more friction than smooth surfaces.

static friction → term for an object's resistance to start sliding

period → term for the farthest position from the sun in a planet's orbit

electromagnetic force → the fundamental force that exists only between electrically charged bodies, binds the electrons of an atom to the nucleus, and causes an atom to resistance the penetration of its space by another atom

law of orbits, law of areas, and law of periods → the law that states that a body in motion tends to move in a straight line at a constant speed, and a body at rest tends to stay at rest, unless acted upon by an outside force

perihelion → term for the farthest position from the sun in a planet's orbit