Chapter 9 Motion and Energy
How do you determine if any object is in motion?
determine if it' distance from a reference point is changing
What is a reference point?
A place or object used for comparison to determine if something is in motion.
What is the length of a path between two points?
What is displacement?
the length and direction of an object has moved from its starting point
How is speed calculated?
If you know the total distance of a trip and the total time it took, what can you calculate?
What is instantaneous speed?
the rate at which an object is moving at a given instant in time
What is speed in a given direction?
How is slope calculated?
What three kinds of change in motion are called acceleration?
increasing speed, decreasing speed, and changing direction
Is there a change in acceleration if a person is driving at a constant rate in a circle?
Yes, they are changing direction.
How is acceleration calculated?
(final velocity - initial velocity)/time
Measurements of acceleration are given in units of?
What is kinetic energy?
the energy of motion
How is kinetic energy calculated?
1/2 * mass * speed^2
What type of energy has the potential to do work?
How is gravitational potential energy calculated?
weight * height
The potential energy of objects that can be stretched or compressed is called what?
elastic potential energy
How is mechanical energy calculated?
kinetic energy + potential energy
What does the law of conservation of energy state?
energy cannot be created nor destroyed