Greaaaat... more physics
What physical quantity is represented by the slope of a velocity-time graph?
acceleration
A student walks 60 m east and then 80 m west. Which is the student's final displacement?
20 m west or -20 m
What is the equation is used to calculate displacement?
change in position = final position minus initial position
An object has a positive velocity and a positive acceleration. What is happening to the object's speed?
It is speeding up
List three vector quantities.
Force, Velocity, Acceleration, Displacement
What does a negative slope on a position-time graph indicate?
negative velocity
If two vectors are equal in magnitude but opposite in direction. What is their sum?
zero
What is the equation to calculate average velocity?
total displacement divided by total time
If we include air resistance for a projectile, what will be one effect on the projectile?
Air resistance causes horizontal acceleration; the object slows down horizontally; the object doesn't acceleration as much vertically
What is the definition of a vector?
It has both magnitude and direction
What does a horizontal line on a position-time graph indicate?
zero velocity; a stopped object; no movement
During a skydive, a person reaches a state of dynamic equilibrium. If the person has a weight of 670 N, how much air resistance is acting on the skydiver. Assume the net horizontal forces are zero.
670 N
What is the Pythagorean theorem?
a2 + b2 = c2
What does the magnitude of a force describe?
The strength of the force
When a penny is dropped off the Empire State Building, it accelerates at 9.8m/s2 downward. This tells us that the object’s __________ changes by 9.8 m/s, every second.
velocity
Which symbol represents the acceleration due to gravity?
g
What is the acceleration due to gravity near Earth's surface?
-9.81 m/s2
Free points!
Who you gonna steal from?
Which force acts on an object in true free fall?
A soccer ball rolls across the field until it eventually stopes. Why does the ball stops?
An unbalanced force like friction opposes its motion.
What is the maximum-range launch angle for an ideal projectile launched and landing at the same height, ignoring air resistance?
45 degrees
What is 2+2?
4
What is the net force formula?
Fnet = ma
In ideal projectile motion, what happens to horizontal velocity during flight?
it remains constant
What type of path does an object follow during ideal free fall if it is launched horizontally or at an angle?
parabola