Relative Reality
Your speed if you are sitting on a bus moving at 20 m/s East, relative to your bus seat
What is 0 m/s?
The total displacement of a runner who runs 100 meters East and then runs 100 meters West back to the start.
What is 0 meters?
Scientific acceleration occurs whenever there is a change in this (which includes speed or direction).
What is velocity?
What is gravity?
This type of friction is stronger than kinetic friction, explaining why it's harder to start moving a heavy couch than to keep it moving.
What is static friction?
Your resultant velocity relative to the street if you walk 1 m/s toward the back of a bus moving 15 m/s East.
What is 14 m/s East?
Between "45 m/s" and "25 m/s North," the one that is considered a vector (velocity).
What is 25 m/s North?
A car driving a steady 30 mph around a circular track is doing this because its direction is constantly changing.
What is accelerating?
A magnet pulling a paperclip is an example of this type of force that acts over a distance.
What is field force?
Adding oil or grease reduces friction by creating this to prevent surfaces from physically touching.
What is liquid barrier?
This concept describes how motion is measured based on the observer's point of view (like the street vs. inside the bus?.
What is relative motion (or frame of reference)?
What is 7.3 m/s?
The acceleration of a flowerpot that starts from rest and reaches 14.7 m/s in 1.5 seconds.
What is 9.8 m/s2?
This is the net force when a "Forward Force" from an engine is exactly equal to the "Friction Force."
What is zero?
According to the "Engineer's Toolkit," adding mass to an object increases friction by increasing this specific force.
What is normal force?
This is the specific term for the object or point from which movement is determined, such as the bus seat or the street.
What is frame of reference?
Unlike speed, velocity is a vector because it must include both a numerical value and this.
What is direction?
While a horizontal line on a Speed vs. Time graph indicates constant speed, a line with a downward slope indicates this.
What is slowing down?
This pillar of the universe is the strongest force in nature, responsible for holding the nucleus of an atom together.
What is strong nuclear force?
This is the specific form of energy that friction often converts to kinetic energy into, which explains why tires get hot after a long drive.
What is heat?
If you are on a bus moving 20 m/s East and another bus passes you going 20 m/s East, this is the perceived speed of the other bus relative to you.
What is 0 m/s?
A runner travels 10 meters North, turns around and travels 15 meters South; this is their final displacement.
What is 5 meters South?
A car increases its velocity from 0 m/s to 30 m/s in exactly 5 seconds; this is the rate of acceleration.
What is 6 m/s2?
When the "Forward Force" and "Friction Force" are perfectly balance, and object in motion will continue to move at this type of speed.
What is constant speed?
Engineers describe friction as the result of these two microscopic features "locking" together between two surfaces.
What are hills and valleys?