Work and Energy
Dimensional Analysis
Force
Kinematics
Vocabulary
100
The standard unit for work and energy
What is the Joule?
100
How many millimeters are in one meter
1000
100
Definition of force
a push or pull upon an object resulting from the object's interaction with another object
100
What does this graph state about the path of a car?
The car is speeding up with a constant positive velocity
100
The only force acting on an object is gravity the object is said to be
free fall
200
The definition of work and energy
What is energy transfered by a force
What is the ability to do work
200
A mass of 0.15 ounces is equal to how many grams?
4.3g
200
A force is applied to the right to drag a sled across loosely packed snow with a rightward acceleration. Neglect air resistance. A free-body diagram for this situation looks like this:
- Fapp
-Ffrict
-Fgrav
-Fnorm
200
What does this graph say about a car?
There is a positive velocity with zero accerleration
200
Energy cannot be created or destroyed but can be converted from one form to another
What is the Law of conservation of energy
300
What point is there more GPE in a swinging pendulum
- At the top
- At its lowest point
- In between the top and lowest point
At the top
300
Change a speed of 72.4 miles per hour to its equvalent in meters per second.
What is 32.7 m/s
300
The 5 different types of forces
- applied force
- tension force
- gravitational force
- normal force
- air resistance force
- frictional force
300
The slope on an acceleration vs. time graph represents what?
slope of an acceleration graph represents a quantity called the jerk. The jerk is the RATE OF CHANGE of the acceleration.
300
The rate at which the velocity changes
what is acceleration
400
Five formulas used for work and energy
- W = F*d
- F = m*a
- KE = 1/2mv^2
- GPE = mgh
- W = F*d*cos(theta)
400
0.0054 weeks is equivalent to how many minutes?
54.432 minutes
400
What is equivalent to 1 Newton.
Think formula
- kg * m/s^2
400
A rock is dropped from a cliff that is 80 m above the ground. If the rock hits the ground with a velocity of 40 m/s, what acceleration did it undergo?
Formula: v2 = vi2 + 2a(x - xi) = 2a(x - xi) = 2aΔx
What is 10 m/s^2
400
Newtons first law of motion is also known as...
inertia
500
The Work-energy formula
What is W = deltaKE = KEf-KEo = 1/2mvf^2-1/2mvo^2
500
The nile holds 1.8*10^12 gallons of water. If just the Mediterranean Sea removed water from the sea and it never rained again, how many days would the water last? Egypt uses 1.3 * 10^6 gallons of water / day
(1.3*10^6 gal / day) (x Days) = 1.8*10^12
500
Newtons three laws are...
- An obj at rest remains at rest unless acted on by an outside force vis versa for an object in motion
- F = ma
- For every action there is an opposite and equal reaction
500
What are five commonly used Kinematic equations?
- vf = vi +at
- vf^2 = vi^2 + 2ad
- d = vi *t + 1/2 * at^2
- d = vi + vf / 2 - t
- Delta x = vi * t + 1/2 at^2
500
the curved path that an object follows when thrown, launched, or otherwise projected near the surface of he earth
What is projectile motion?