Forces Quiz Flashcards
Force
A physical quantity that describes the interaction between bodies. (push or pull)
Are forces vector or scalar quantities?
Vector (magnitude and direction)
Do forces ever occur on their own?
Never
What is Newton’s Third Law?
Every action has an equal and opposite reaction.
What are Field forces?
Forces that act at a distance without bodies touching.
What is a gravitational force?
-A type of field force
-known as the weight of a body
-symbol is Fg
-every object that has mass experiences it
What is the equation for gravitational force?
Fg=mg **g=9.81N/kg
What gravitational forces are occurring as an apple falls?
The Earth exerts force on apple. And the Apple exerts force on Earth.
What are normal forces?
The contact force that acts on a body that is perpendicular to the surface in contact with the body. (FN)
What is a friction force?
A force between two surfaces when in contact. It impedes motion and results in heating. (Ff)
What is the equation for a friction force?
Ff=μsFN
What is Newton’s first law? (Law of Inertia)
An object at rest or moving with constant velocity continues its behavior unless acted upon by an external force.
What is Newton’s second law?
Force is equal to the product of mass and acceleration (F=ma)
What is tension force?
Pulling force transmitted axially by means of a string or similar object (FT) (T=mg-ma)
What is the center of mass?
The average location of all the mass contained in an object.
What is a free body diagram?
A rough diagram of an object that shows the approximate forces acting on each object.
What is Net Force?
The sum of all forces acting on an object.
What is Equilibrium?
The state of an object whose net force is zero. (a=0)
What is the difference between dynamic and static friction?
Dynamic friction (also known as kinetic friction) is the force opposing motion while motion is occurring. Static friction is before motion is occuring.
What is μs?
The dynamic coefficient for friction. (depends on the materials)
What is drag force?
A force that opposes motion of bodies through a fluid (gas or liquid)
What is buoyancy force?
Opposite of drag. Its the upwards force from a fluid (liquid or gas) causing an object to float or sink.
What is terminal velocity?
The maximum velocity and object can attain as it falls through a fluid. (sum of drag force and buoyant force equals gravitational force)
