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BJU Physics Chapter 6
Terms in this set (34)
Internal qualities that make it seek a preferred position.
Objects require a force to achieve an unnatural position.
A hypothesis tacked onto another in order to fit a specific case.
Principle of Inertia
States that an object at rest tends to stay at rest, and an object in motion will continue in its current state of motion unless an outside agent acts on it.
The quality of an object to resist change in its state of motion.
An agent that causes or opposes changes in motion of matter.
A push or a pull.
Are vectors and can be added and subtracted as other vectors by geometry or analytically using trigonometric functions.
When the sum of all simultaneous forces acting on an object equals zero.
Change an object's state of motion.
A vector that can balance the resultant force.
A force that balances one or more other concurrent forces.
A vector having the same magnitude as the unbalanced force sum but pointing in the opposite direction.
The force of gravity acting on an object.
Inherently part of the atomic building blocks of matter.
Scientists have identified only four:
• Strong Nuclear
• Weak Nuclear
This long range force is proportional to the mass of objects and exerts its influence over theoretically infinite distances.
A long range force that is responsible for chemical bonding and other interactions of atoms and molecules.
Strong Nuclear Force
Binds together the particles forming the nucleus.
Weak Nuclear Force
Holds certain elementary nuclear particles together and is involved in several modes of nuclear decay.
Model in which forces that do not require physical contact for transmission of the forces are thought to emanate from certain objects and matter in general.
Gravity and the electromagnetic forces. No physical contact is required to transmit or exert these forces.
This theory proposes that the gravitational influence of matter and the attraction or repulsion of magnetic or charged particles are properties of the space surrounding the matter (the field).
Exchanged between matter with like characteristics. The exchange supposedly creates the force.
Contact (Mechanical) Forces
Forces that are transmitted only by physical contact between objects.
Tension (Tensile Forces)
Forces that tend to pull things apart.
Forces that tend to push things together or to crush.
Forces that oppose motion between two objects in contact.
Forces that tend to cause layers within matter to slide past one another.
Demonstrates the addition of force vectors.
Newton's Laws of Motion
Summarizes the principles of dynamics.
An object will continue in its present state of motion unless acted upon by unbalanced force.
The net force on an object is proportional to the product of its mass and acceleration, ∑F = ma.
Acceleration is directly proportional to force.
To every action there is an equal but opposite reaction.
Contained within an imaginary border that separates it from its surroundings.
Set of related forces acting on an object.
The vector sum of all applied forces is zero.
Action Reaction Force Pair
equal in size, opposite in direction, act on different systems
Two objects exerting equal and opposite forces on each other.
Pound Force (lbf)
One is equivalent to the weight, measured at the earth's surface, of a mass equal to one EES pound mass.
Used to measure force because the force on a spring is proportional to its stretch.
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