Lecture 2 (Mass, Force, and Newton's Laws) Flashcards Preview

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Flashcards in Lecture 2 (Mass, Force, and Newton's Laws) Deck (13):
1

Newton's First Law

-Law of Inertia
-An object's state of motion (V) will not change unless a net force acts on the object.
-An object a rest will remain at rest
-An object moving will continue to move with constant V
-no net force=no acceleration

2

Newton's Second Law

F=ma
Unit of Force is Newtons (N)
1 N = 1 kg*m/s^2

3

Newton's Third Law

For every action, there is an equal but opposite reaction.

If object 1 exerts a force (F1) on object 2, then object 2 exerts a force (F2) on object 1. These forces (F1 and F2), have the same magnitude but act in opposite directions.

form an action-reaction pair. Forces may be equal in magnitude but the effects on the objects may differ.

4

weight

the gravitational force exerted on an object by the earth
w=mg
where g=gravitational acceleration
units in Newtons

5

mass

the measure of an object's inertia, its resistance to acceleration.

intrinsic property of an object, does not change with location
Units in kg

6

Newton's Law of Gravitation

Fgrav (w)= G (Mm/r^2)
G=Newton's gravitational constant (provided)

inverse-square law- the magnitude of the Fgrav is inversely proportional to the square of the distance between the centers of the objects

g=G(M/r^2)

7

static friction

when there is no relative motion between the surfaces that are in contact
always greater than the kinetic friction

8

kinetic friction

when the is relative motion between the surfaces (sliding)

9

Normal Force

N=mg
the perpendicular component of the contact force exerted by a surface on an object.

10

Force of Kinetic Friction

Ff=(µk)(Fn)
Ff= friction force
Fn= normal force
µk= coefficient of kinetic friction

11

Maximum Force of Static Friction

Ff max= (µs)(Fn)
where,
Ff max=maximum static friction force
µs= maximum coefficient of static friction
Fn= normal force

12

force due to gravity acting parallel to the inclined plane

=mg sinθ
where θ, is measured between the incline and horizontal

13

force due to gravity acting perpendicular to inclined plane

mg cosθ