Oat Physics

meter

kilogram (kg)

second (s)

m/s

kg/m^3

kg*m^2/s^2

pico

nano

10^-12

10^-9

10^-6

10^-3

10^-2

10^3

10^6

10^9

10 m/s^2

Natural resistene to change in their state of motion

There are no net force on an object

(There can be forces on object but just cancel each other out)

Quantitative measure of its inertia (mass measures how much matter is contained in an object)

Kilograms (kg)

inertia

Net forces (total force) acting on an object of mass (m) then the resulting acceleration of the object (a) satisfies this simple equation

F = (m)(a)

Same direction

Because m is a positive number

An objet will acceleration in a direction of the net force it feels

No, if F = 0 it means that acceleration is zero which means that the object's velocity does not change but that does not necessarily mean that it is not moving, just means it is not accelerating

Forces two object act on each other are equal but opposite

No, the effects (or resulting acceleration) are not the same if the masses of the objects are different

The answer does not involve the masses of the objects; Newton's third law says nothing about the mass

F net is the sum of all the forces acting on an object, not by an object

The gravitational force exerted on it by the earth (or by whatever planet it happens to be on or near)

Mass

Yes

No

w = m (g)

inverse-square law

The magnitude of the gravitational force is inversely proportional to the square distance between the centers of the objects

Since the gravitational force obeys an inverse-square law, if r increases by a factor of 2 then gravitational force will decrease by a factor of 4

Gravitational force will increase by a factor of 4

When two materials are in contact, electrical attraction between the atoms of one surface with those of the other

If surfaces aren't perfeclty smooth, the roughness will increase the force required to slide the objects against each other

Static friction

Kinetic (sliding) friction

Gravitational force

Normal force

Both magnitudes are the same

No

While these forces are equal but opposite, they are only acting on ONE object. An action-reaction pair always acts on different objects

Perpendicular componenet of the contact force exerted by a surface on an object

Force of kinetic friction = (coefficient of kinetic friction)(normal force)

coefficient of kinetic friction = greek symbol mu with subscript k

Opposite direction of object's velocity

Maximum coefficient of static friction

F f, max = (maximum coefficient of static friction ) ( normal force)

Maximum coefficient of static friction = greek letter mu subsript s

Parallel to surface

Opposite direction to object's intended velocity

Changes the direction of the tension that pulls on the object that the string is attached to

Decrease the force necessary to lift an object

Causes a constant tension to exist through the entire string, which can lead to multiple tension forces pulling on an object

It is the point that behaves as if the object was a single particle

It i also the point at which we could consider all the mass of the object to be concnetrated

x cm = (x1m1 + x2m2+ x3m3+....)/(m1 + m2+m3)

Point at which the ottal gravitational force on the system can be considered to act

X CG = (w1x1 + w2x2 + w3x3 +....) / (w1 + w2 + w3)

Yes

Speed

(But vector is still changing)

No, the acceleration is only changing the direction of the velocity in order to keep the object moving in a circle

Seeking the center

Describe the accelration of an object undergoing uniformal circular motion

ac = (v^2)/r

A force

Centripetal force

F c = ma(c) = (mv^2)/r

Actually it is falling toward the center, but because of its speed, the object reamins in a circular orbit around the center.

A measure of a force's effectiveness at making an object spin or rotate

t = r F sin(delta)

N*m

x