L2 Forces, Mass, Acceleration, Pressure, Review of Exponents. Frictionless motion Demo. 5.NEWTON’S FIRST LAW OF MOTION. Newton finished the overthrow of Aristotelian ideas. Law 1 (Law of Inertia)
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.)
This symbol means
The acceleration of an object is directly proportional to the net force.
5. NEWTON’S SECOND LAW OF MOTION
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
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