27 terms

Physical Science Unit Study Guide

Includes all information for test on April 23rd EXCEPT DRAWINGS.
PLAY
Velocity
Speed with direction
Momentum
Product of an object's mass and its velocity.
Balanced Force
Net force on object equals zero.
Unbalanced Force
Net force does NOT equal zero.
Friction
Force of 2 objects, in contact, that oppose movement of the other.
Gravity
Force of attraction between 2 objects.
Inertia
Tendency of an object to remain at rest or in motion at a constant velocity.
Free Fall
Motion of body when gravity is acting on it.
Terminal Velocity
Maximum velocity reached by a falling object that occurs when the resistance of the medium is equal to the force due to gravity.
A person walks 1000 meters in 15 minutes. What is the person's speed?
Speed = Distance/Time
1000/15= 66.67m/s
What is the SI unit for Length?
meters
What is the SI unit for Mass?
kilograms
What is the SI unit for Volume?
Liters
What is the SI unit for Temperature?
Kelvins
What is the SI unit for Time?
seconds
EXPRESS THE NUMER IN SCIENTIFIC NOTATION!

20100 m
.0000014 g
2.01 × 10 ⁴ m
1.4 × 10 ⁺⁶ g
CONVERT THE FOLLOWING UNITS FROM GRAMS to the given UNIT.

5.63 g into µg
10 g into kg
5630000. µg
.010 kg
Determine the number of sig figs in the following numbers

1. 1025028
2. .0002
3. 1000.
4. 1000
5. 1.02000
1. 7
2. 1
3. 4
4. 1
5. 6
I have counted and there are 25 people in a class. (Focus on the number 25 in this sentence.) How many sig figs are there?
Infinite
What does Fa stand for?
Applied Force
What does Fg stand for?
Force due to Gravity
What does Ff stand for?
Force due to Friction
What does FN stand for?
Normal force
What does FNET stand for?
Net force
Review the elevator question. You must be able to label why something is positive (applied force) and something is negative (Opposite direction of the applied force).
FNET= -960 N (The force is negative because it is in the opposite direction of the motion of the system. Think about this. The elevator is going up. The opposite of up is down. That is the same as 215 pounds!)
Explain what is wrong with the following sentence: A man walked at a velocity of 12 m/s.
There is no direction.
A girl participating in cross-country spends the afternoon practicing, and ends the practice completely tired from her hard work, despite the fact that her average velocity during the practice was 0.0 m/s. Explain how this situation is possible.
She ran back to where she started, so technically there was no displacement.