Conceptual Physics: Chapter 4- Newton's First Law of Motion - Inertia
Terms in this set (37)
Force cause ____
Types of Motion:
2. violent motion
Initially Natural Forces not thought of to be caused by forces. It only worked in what directions?
Straight up or straight down
Aristotle said that circular motion was natural for
There is no end
Violent motion was
Violent motion was result of forces that
pushed or pulled
Violent motion moved objects that were in
their natural resting places
T or F: Old thinkers thought that Earth moved?
False. A force large enough to move Earth was unthinkable
Copernicus created the theory of
A moving Earth and other planets around the sun.
Galileo, a supporter of Copernicus, contributed to physics by demolishing that notion that ____ was necessary to keep an object moving
any push or pull
the name given to the force that acts between materials that touch as they move past each other.
Friction is caused by
irregularities in the surfaces of objects that are touching
Tendency of a moving body is
to keep moving.
Body to resist change is
Law of inertia
every object continues in a state of rest, or of motion in a straight line at a constant speed, unless it is compelled to change that state by forces exerted upon it
Why are forces needed in motion?
To overcome any friction that may be present and to set objects in motion initially.
In a force free environment, an object will
move in a straight line indefinitely
Amount of inertia in an object depends on
More mass is greater or lesser inertia
T or F: How many kgs of matter an object contains and how much space the object occupies are the same things
Mass overpowers what measurement in terms of inertia
a measure of the amount of material in an object and depends only on the number of and kind of atoms that compose it.
a measure of the gravitational force acting on the object
Weight depends on
an object's location
Objects with great mass have
1kg is equal to how many Newtons
Weight is equal to
mass * acceleration
In the absence of net force, objects
do not change their state of motion
Net force is
combination of all forces acting on an object
What changes an object's state of motion
What is support force also called?
When an object is at rest, and the net force is zero, the object is in a state of
The resultant of forces must equal the object's ___ when the object is at equilibrium
Force (in Newtons)
Force is scalar or vector
Tension is higher,
The vertical force of gravity affects
only the vertical motion