A vector quantity is any quantity that is completely described by a numeral, a unit, and a(n) __________.
direction
The change in position of an object.
displacement
If an object moving in a straight line covers equal displacements in equal times, then it is said to have...
constant velocity
A straight line with a negative slope on a position-time graph represents a(n) __________ constant velocity.
negative
The __________ __________ between any two points on a position-time graph is equal to the slope of the line joining the two points.
average velocity
The rate of change of velocity.
acceleration
The acceleration an object  has at a specific instant of time.
instantaneous acceleration
The velocity-time graph for constant velocity is a(n) __________ __________ line.
horizontal straight
The slope of the straight line on a velocity-time graph is...
constant acceleration
The weakest of the four fundamental forces.
gravity
The vector sum of all the forces acting simultaneously on an object.
net force
The amount of material in an object.
mass
The force of gravity that a celestial body, such as Earth, exerts on a mass.
weight
The law of universal gravitation was proposed by Sir...
isaac newton
The ratio of the force of gravity to mass at a specific location is called the...
gravitational field intensity
The gravitational field intensity __________ as we move away from the equator, north or south.
increases
The gravitational field intensity __________ as we move away from the centre of the Earth.
decreases
Which one of these locations have the largest gravitational field intensity? a: Greenland; b: Mount Everest; c: New Zealand; d: North Pole; e: Toronto
d
Which one of these locations have the smallest gravitational field intensity? a: Greenland; b: Mount Everest; c: New Zealand; d: North Pole; e: Toronto
b
Which early Greek philosopher (last name) thought that heavy objects fell faster than lighter ones?
aristotle
Which Italian astronomer / physicist (first and last name) predicted that heavy objects and light ones would fall at the same right if there were no air resistance.
galileo galilei
Which branch of mechanics describes the motion of an object without considering the cause?
kinematics
Which branch of mechanics deals with the causes of changes in motion?
dynamics
Which philosopher (last name) thought that all matter on and near Earth was a mixture of four elements: earth, water, air, and fire.
aristotle
Which physicist (first and last name) proposed that a force is only necessary to keep an object in motion because another force is opposing the motion.
galileo galilei
__________ friction opposes the motion of objects once they are moving.
kinetic
__________ friction attempts to keep surfaces at rest.
static
The normal force is exerted __________ to the surfaces in contact.
perpendicular
Which principle (property of an object) materialized from Galileo's claim that a stationary object tends to stay at rest and a moving object tends to keep moving.
inertia
Every object will continue in a state of rest or with constant speed in a straight line unless acted upon by an external unabalanced or net force is Newton's __________ Law of Motion.
first
The net force is directly proportional to __________ if mass is constant.
acceleration
Acceleration is inversely proportional to __________ if the net force is constant
mass
__________'s Second Law of Motion: When a net force acts on an object, the object accelerates in the direction of the net force. The acceleration is directly proportional to the net forc4e and inversely proportional to the mass.
newton
According to Newton's Third Law of Motion, whenever one object exerts a force on a second object, the second object exerts a force that is __________ is magnitude and opposite in direction on the first object.
equal
The reaction force is the force exerted by an object when a(n) __________ force is exerted on it.
action
Which student of Galileo's (last name) described how balance is maintained when humans walk by making measurements of the centre of gravity of the body (the earliest account in gait analysis).
borelli