Formulas
Which formula would you use if you had acceleration, initial velocity, final velocity and were looking for time?
Which variable means "how far"?
d
What unit is time measured in?
What changes when you go from the Earth to the moon? Mass or weight?
Weight
An object is dropped down a well. It hits the water below after 2 seconds. How deep is the well to the water?
19.6 meters deep
What formula CAN'T you use if you're looking for time?
Formula 2
How fast an object in freefall is going just before it hits the ground is:
Vf
Acceleration due to gravity on Earth is measured in what unit?
m/s2
What does Fg = mg mean?
Weight is equal to the mass of an object multiplied by the acceleration due to gravity on that planet
-640 N
Which formula would you use if you wanted to calculate the height at which an object was DROPPED on EARTH if it fell for 3 seconds
Formula 3
What am I asking you to find in the following problem: I throw an object upward and after 3.0 seconds it reaches a maximum height of 5 meters. How fast is traveling when I released it?
Vi
If asked "how fast" an object is moving, what unit should you report your answer in?
m/s
Which is bigger, pounds or Newtons?
Pounds
334 N
Which formula should you use if your KNOW list says the following:
a = -9.8 m/s2
vi = +3.4 m/s
vf = 0 m/s
d = ?
Formula 2
What does Formula 1, say (state the quantities represented by the variables you see)
acceleration is equal to the final velocity minus the initial velocity over time
If using Formula 3 to solve for the height of an object, what unit will you report your final answer in?
meters
True
An object is thrown downward from a window toward the ground with a speed of 3.4 m/s. It falls for 2.5 seconds. How fast is the object traveling just before it hits the ground?
-28 m/s
An object is thrown downward at -4.68 m/s and hits the ground 0.50 seconds later. Which formula would you use to find how far it fell?
Formula 3
The rate at which an object falls faster toward Earth due to gravity is
a
-9.8 m/s2
What is the unknown variable measured in if the word problem states: An object is dropped from a height of 10 meters. How fast was it going just before it hit the ground?
m/s
Why does a crumpled up paper ball fall faster than it would before it was crumpled up?
The crumpled paper hits fewer air molecules on the way down, therefore the air resistance is less.
An astronaut weighs 29.1 pounds on the moon. If g = -1.6 m/s2 on the moon, what is the astronaut's mass?
81 kg