L2 Forces, Mass, Acceleration, Pressure, Review of Exponents

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L2 Forces, Mass, Acceleration, Pressure, Review of Exponents

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L2 Forces, Mass, Acceleration, Pressure, Review of Exponents

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5.NEWTON’S FIRST LAW OF MOTION

Newton finished the overthrow of Aristotelian ideas.

Law 1 (Law of Inertia)

Every object continues in its state of rest, or of uniform motion in a straight line, unless it is compelled to change that state by forces impressed upon it.

“If you leave an object alone, it has constant velocity.”

(a) constant velocity

(b) constant acceleration

(c) constant net force

The combination of forces that act on an object is the net force.

(Only the net force is shown in the figures on this slide.)

m

m

m

This symbol means

proportional to

F

a

F

a

F

a

The acceleration of an object is directly proportional to the net force.

5. NEWTON’S SECOND LAW OF MOTION

- The force in each of these equations represents the vector sum of all of the forces acting on the object of mass m.
- Units of force - N and lb

or

slug)

A slug weighs

Every object possesses inertia (mass).

Inertia is the sluggishness of an object to changes in its state of motion.

Mass - a measure of the inertia of an object

(Units - kg and

32 lb.

- Inertia deals with how hard it is to start and stop an object.

m1

m2

r

At earth’s surface,F = G mMe/Re2 orW = (Gme/Re2) m or W=(g)m orweight = mass x acceleration of gravityg = 9.8 m/s2

Pressure=Force/contact areaOn left, the pressure on the bottom block, i.e. the weight of the top block/contact area, is lower than the pressure on the bottom block on the right.

1000 = 10 x 10 x 10 = 103

100 = 10 x 10 = 102

10 = 101

1 = 100

0.1 = 1/10 = 10-1

0.01 = 1/100 = 10-2

0.001 = 1/1000 = 10-3