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Posted May 20, 2014
Velocity is the speed of an object in a certain direction.
A ride at the amusement park may run at constant speed , but its velocity is changing when its direction of motion is changing. A roller coaster is called a coaster because once it starts,it coasts throughout the entire track. No outside forces are required for most coasters. (A few have double or triple lift hills and braking sections.) Roller coasters trade height for velocity and velocity for height. Most all calculations rely on using velocity measurements in one way or another. The higher the velocity, the quicker an object travels between 2 locations. Phrases like, how fast and how quickly,are used to describe velocity. Often, the word speed is substituted for the word velocity, but the two are different.
Velocity is actually speed with direction. For example, 60 mph, west, is a velocity. "West" is the direction and 60 mph is the speed. Velocity differs from speed in that velocity tells not only the speed at which the roller coaster is moving but also the direction. If a roller coaster goes around a bend or a loop, even if its speed is not changing, its velocity is changing because its direction of motion is changing; this change requires the application of a force.
There are two ways to experience weightlessness. 1. Move far away from the planes and sun where the pull is NEARLY zero.
2.Fall down at a rate equal to the pull of gravity.
In other words, accelerate to the Earth speeding up to 22 mph every second in the air. In order for a person to feel weight, a person must sense the reaction force of the ground pushing in the opposite direction of gravity.
Weight is the force with which an object is pulled toward the earth by gravity.
Weight is the pull of gravity. Topical weight units are pounds and newtons. (1 lb equals 4.45 Newtons). On the moon, things are compared as 1/6 compared to Earth.
SINCE I HAVE TO STUDY:
WORK IS LIKE A CHAIN PULLED BY A MOTOR PULLING A COASTER UP A HILL TO RESIST THE FORCE OF GRAVITY!
Posted April 10, 2012
Posted October 11, 2010
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