0014 Force, Mass and Motion: 1. distinguish between mass and weight of an object. Quantity of matter in an object The measurement of inertia Brick = 1kg. The gravitational force exerted on an object by the nearest, most massive body (Earth) Brick = 2.2 pounds.
The measurement of inertia
Brick = 1kg
The gravitational force exerted on an object by the nearest, most massive body (Earth)
Brick = 2.2 poundsMass vs Weight
[final velocity – initial velocity (m/s)] / time (s)
= 80 m/s / 12 s
= 6.67 m/s/s
or 6.67 m/s2
Figure 2-8 12 seconds.
Galileo’s falling-ball apparatus with a table of measurements and a graph of distance versus time.
Accel = final vel – initial vel (m/s) / time (s)
= 10 m/s – 0 m/s / .5 s = 20 m/s/s
F = 75 kg x 20 m/s2
F = 1500 N
Figure 2-13 rest to a speed of 10 meters per second in half a second?
An apple falling, a ball being thrown, a space shuttle orbiting the Earth, and the orbiting Moon, all display the influence of the force of gravity.
Work is done when a force is exerted over a distance.
1 joule of energy in 1 second.
(75 watt light bulb consumes 75 J/sec)
direction of force.