A
Isaac Newton published the laws of motion and universal gravitation in his book _______________.
Principia
What is defined as distance traveled in a given time?
speed
Physical quantities having magnitude but not direction are ______________ quantities.
scalar
Description: states the relationship between the hypothenuse and legs of a right triangle.
Pythagorean theorem
Description: sloping surface that allows an object to be raised without lifting it straight up.
inclined plane
What is the name for the distance between the ridges on a screw?
pitch
Physical quantities having both magnitude and direction are ___________ quantities.
vector
What term refers to a single vector showing the combined effect of two or more vectors?
resultant
Description: for every action there is an equal and opposite reaction
3rd law of motion
Description: the velocity of an object does not change unless the object is acted upon by an external force.
1st law of motion
What term refers to the gravitational force exerted on an object near the surface of the earth or any celestial body?
gravity
The velocity at which the force of air resistance on a falling object equals the object's weight is the _________________ velocity.
terminal
The SI unit of power is the ______________ and the SI unit of force is ___________.
watt , newton
9.81 m/s2
What term refers to the branches of physics developed before the 20th century?
classical physics
Under ideal conditions, a machine's work output is _greater than, less than or equal to__ its work input.
equal to
In physics, any change in speed, direction, or both is ______________.
acceleration
Name the resistance arising to an object's motion through a fluid or across a surface.
friction
The "quantity of motion" of an object, equal to the product of the object's mass and velocity, is __________________.
momentum
law of universal gravitation
Description: resembles an inclined plane wrapped around a rod.
Description: circular lever
screw, wheel and axle
Description: when the overall external force acting on a system is zero, the momentum of the whole system remains constant.
law of conservation of momentum
The vector representing the change in an object's position is _______________.
displacement
A "center-seeking" force that causes an object to travel in a curved path rather than in a straight line is _____________ force.
centripetal
Description: combination of fixed and movable pulleys
Description: special form of inclined plane that modifies force and directs it to the side.