Energy
The sum of all of the kinetic and potential energy
What is mechanical energy?
This form of motion can never be negative
Speed
This kind of acceleration increases velocity.
+ acceleration increases velocity
Force is measured in these units
This force can change the direction of an object in orbit
Gravity
A skater going up a halfpipe, a rollercoaster climbing a hill after a descent, a baseball thrown up into the air...
Examples of Kinetic energy turning into Potential energy
These forms of motion are considered vectors.
Velocity and acceleration
A car making a turn, a satellite in orbit, and a wheel spinning are examples of this.
Centripetal accelleration
The resistance of an object to a change in motion.
Inertia
An object in orbit is in _______ when the only force acting upon it is gravity.
Free fall
Speed & Mass and Speed & Height
What are the factors that affect KINETIC and POTENTIAL energy? (For 50 bonus points, which is which?)
(Distance / Time) + Direction
What is velocity?
A car goes from 50 m/s to 48 m/s, what kind of acceleration?
Negative
These 3 types of energy are transferred through direct contact
Mechanical, physical and friction
The gravitational force between 2 objects is proportional to its _______, and inversely proportional to the square of the distance between them.
Mass
Does an object in orbit have potential energy, kinetic energy, both or neither?
Both
What do you need to determine an object's location?
Position and reference point
You can't divide by zero.
This equation describes Newton's 2nd Law
f = ma
Any object with mass is affected by gravity. Nothing with mass is truly "_________."
Weightless
Shaq is on a playground and playing on the swings. When is his mechanical energy at its highest:
at the top of his swing,
at the bottom of his swing,
or halfway in between?
Trick question: mechanical energy doesn't change! MWAHAHAHAHAAAAAAA
A boat travels West at a speed of 5 km/hr. What else is needed to calculate its velocity?
Distance
A car travels in a straight line. The driver uses the brakes to stop. What happens to the velocity and acceleration vectors?
They point in opposite directions
Electrical energy, magnetic energy and gravitational energy
What kinds of energy can be transferred from a distance?
These 2 forces combine to produce an orbit
Forward and downward motion