Module 1
The main difference between a scalar quantity and a vector quantity.
What is: a vector quantity has information about direction, while a scalar quantity does not?
1.1
The two conditions must be met before you can use the 3 equations:
v = vo + at
v2 = vo2 + 2 a (delta)x
(delta)x = vot + 1/2 at2
What is 1. motion must always occur in a straight line and 2. the acceleration of the object must be constant?
2.1
The angle of a vector is always defined relative to this.
What is the x-axis?
3.1
This is what we know about the y-component of a projectile's velocity when the projectile is at its maximum height.
What is zero?
4.2
This is the main difference between instantaneous velocity and average velocity.
What is average velocity is measured over a finite time interval while instantaneous velocity uses an infinitesimally small interval?
1.4
This arises because some molecules and atoms resist being shoved out of the way when an object falls which reduces the object's acceleration.
What is air resistance?
2.2
A vector with a negative x-component and a positive y-component falls in this region of the Cartesian coordinate plane.
What is region II?
3.4
What do we know about the x-component of a projectile's velocity when the projectile is at its maximum height?
What is the x-component is the same as when the projectile was launched?
4.2
This is what physicists mean when they say velocity is "relative."
What is the velocity an observer sees actually depends on the velocity of that observer?
1.6
This is the definition of free fall.
What is the motion of an object when it is falling solely under the influence of gravity?
2.3
We would have to do this to an angle that was calculated from a vector that has a positive x-component and a negative y-component.
What is add 360 degrees to the calculated angle (since it is in region IV)?
3.6
This happens to the y-component of a projectile's velocity as the projectile travels through the air.
What is the y-component of its velocity continually decreases until it reaches zero; after that the y-component because more and more negative until the projectile hits the ground.
4.5
12.3 m/sec2 is this physical quantity.
What is acceleration? (it is the only physical quantity with those units)
1.7
When an object is thrown up in the air, this is where it has zero velocity.
What is at the maximum height that it attains?
2.6
This object is accelerating more quickly.
What is object 2? (vector B has a larger magnitude)
3.8
This is the number of seconds a projectile reaches its maximum height after being in flight for 4.0 seconds and landing at a height equal to the height at which it was launched.
What is 2.0 seconds (maximum height is reached halfway through the journey)
4.3
This is happening to an object in an instant in time when it has a 1.4 m/sec2 acceleration and a -12.6 m/sec2 velocity.
What is: the object is slowing down? (since velocity and acceleration have opposite signs.
1.8
This is the velocity of a ball that is caught at exactly the same height that it was thrown with an initial velocity of 1.2 m/sec2.
What is -1.2 m/sec2 or 1.2 m/sec2 down?
When the ball returns to the place it was thrown, it has equal and opposite velocity.
2.9
When solving two-dimensional problems, physicists usually split the problems up into this type of problem.
What is two one-dimensional?
3.9
This explains whether a projectile fired in empty space (no planets or stars in the area) will follow a parabolic path or not.
What is: No, it will follow a straight line.
There is no gravity therefore no acceleration in the y-dimension; therefore velocity with not change.
4.6