Variables & Graphing
What is the Independent Variable?
The variable the scientist changes
What is the formula to find the speed of an object?
S= D/ T (Distance divided by time)
How do we remember the formulas to find, force, mass & acceleration?
F, M, A triangle (draw it)
What is the definition of Potential Energy?
Energy that is stored up—Not in motion.
What is the definition of Kinetic Energy?
Energy that an object has due to motion
What is the dependent variable?
What the scientists is measuring, the result/outcome
Define Speed
The distance traveled over a given time
What is the definition of Net force?
The total amount of force acting on an object
What 2 factors affect potential Energy?
Mass (and or weight) and Height
What 2 factors affect Kinetic Energy?
Mass & Velocity
What is the constant variable in this scenario?
The amount of water given to each plant AND the location of the plant.
What is the speed of an object that travels 40 miles in 20 minutes?
2 m/s
What is the difference between balanced and unbalanced forces?
Balanced forces cause no change in motion because they are equal forces. Unbalanced forces cause a change in an objects motion because they are not equal forces.
What is the formula for Potential Energy? (state what each variable stands for)
Mass x Gravity x Height
What is the formula for Kinetic Energy? (state what each variable stands for)
½ x Mass x Velocity2
At which time interval is the person from this graph at rest. How do you know?
1-2 seconds because flat horizontal line represents at rest since the distance is not changing (accelerating) as time passes.
What is the velocity of an object traveling 50 meters north in 10 seconds?
5 m/s north
What is the net force of this object?
5 N left
According to the image, at which point would the roller coaster have the greatest amount of Potential energy and WHY?
Position A, because it has the greatest height.
(C is very close/ similar also. But little lower & also in motion b/c of location on roller coaster track)
According to the image, at which point does the bicyclist have the greatest amount Kinetic energy and WHY?
Position C, because it has the greatest velocity. (It has used up the potential energy and transformed it to kinetic)
Explain what is happening during the time interval of 5-6 seconds.
The object is accelerating, (compared to whole graph) it is also moving backwards towards its reference point/ x-axis.
What is the speed of this object at 5 seconds?
8 m = distance so 8/5 = 1.6 m/s)
What is the acceleration of this object with 10 kg that has a net force of 5 N applied to it?
2 m/s
A football with a mass of 2 kg got stuck in a tree 10 feet above the ground. what is the potential energy?
200 J.
An object has a mass of 100kg and is moving with a squared velocity of 12. What is the kinetic energy?
600 J.