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What are the two main classifications of forces?
fundamental and mechanical
There is no distance limit for…
gravity, its long range
In the 17th century, the first scientist to recognize gravity was…
Sir Isaac Newton
The strongest fundamental force is the…
strong nuclear interaction force
What dominates the universe?
gravity
In distance, you can have…
long range and short range forces
What force balances one or more other concurrent forces?
equilibrant
Sigma represents…
summation
Resultant is the…
sum of multiple forces
When you push on a wall, does the wall push back?
yes, equal force
Are lb’s used in science
no
_____ attempts to explain noncontact forces
field theory
tensile:
pull things apart
compressive:
push things together or crush
torsion:
twist
friction:
opposes motion between two objects in contact
shear:
cause layers within matter to slide past one another
Examples of non contact forces include…
gravity and electromagnetic forces
What has to happen in gravity?
has to be proportional to the mass
What are the 4 fundamental forces?
gravity, electromagnetic, strong nuclear, weak nuclear
What is concurrent?
acting at a single point
The two fundamental forces discovered in the 20th century are…
strong & weak nuclear interaction force
weight is…
the force of gravity acting on an object’s mass
force is a…
push or pull
All matter is held together…
by forces
Forces act…
in pairs
The SI unit for force is…
Newton (N)
There needs to be a decay of force, otherwise…
you would not lose half of its amount
Balanced forces are…
equal in size and opposite in direction
On diagrams, all forces are drawn as…
pulls
When your forces on free body diagrams are unbalanced…
the object moves with the stronger force. which causes acceleration
friction opposes…
motion
Galileo’s principle of inertia states…
an object in motion (or at rest) will tend to stay at motion (or in rest) until acted upon by an outside force
Galileo is the one that discovered…
inertia
Inertia is…
the tendency to remain unchanged
field theory
matter exerts forces on other masses, or magnetic or charged particles when they are placed in their respective fields
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