18 terms

# Conceptual Physics 04: Newton's Second Law

#### Terms in this set (...)

Equilibrium
In general, a state of balance where Fnet = 0
Force
Any influence that tends to accelerate an object. A push or a pull; measured in Newtons.
Friction
The force that acts to resist the relative motion (or attempted motion) of objects or materials that are in contact. A force that works against the motion of an object
Kilogram
The fundamental SI unit of Mass.
Mass
A measure of an object's inertia. Also, a measure of the amount of matter in an object. Depends only on the amount of and kind of particles that compose an object - not on its location.
Newton
SI Unit of Force.
Normal Force
For an object at rest, it is the upward force that balances the weight of the object at rest. Also called a Support Force
Support Force
For an object at rest, it is the upward force that balances the weight of the object at rest. Also called a Normal Force
Weight
The force on a body due to the gravitational attraction of another body (commonly the Earth). (*a downward force!*)
Volume
The quantity of space an object occupies
Newton's Second Law
The acceleration of an object is directly proportional to the net force acting on the object, it in the direction of the net force and is inversely proportional to the mass of the object. In other words... F=ma
Free Fall
Motion under the influence of gravitational pull only
Terminal Speed/Velocity
The speed at which the acceleration of a falling object terminates because air resistance balances its weight.
Acceleration
Change in velocity divided by the time it takes for the change to occur
Inverse Proportion
a relation between two quantities such that one increases in proportion as the other decreases.
Direct Proportion
A relationship between two quantities in which one increases as the other increases
Air Resistance
frictional force air exerts on a moving object; acts opposite in direction to the object's motion.
Depends on two things: speed and frontal surface area
Net Force
The sum of all forces acting on an object. It is the net force that accelerates a mass (in the direction of the net force).