Mass
Identify the unit of measurement and tool used
measured in grams , triple beam balance
liquid volume
Identify the unit of measurement and tool used
liters, graduated cylinder
solid volume
Identify the unit of measurement and tool used
LxWxH cm3 , ruler
temperature
Identify the unit of measurement and tool used
Celsius, thermometer
Explain each part of the scientific method
1. problem/question-what you are trying to figure out
2. Hypothesis- educated opinion
3. Experiment- must have control over independent and dependent
4. Data & Observation- must be detailed
5. analysis- answer questions and gives support data
6. conclusion- refers to hypothesis
what's the purpose of having the control group and an experimental group?
provides baseline for comparison
Explain the independent and dependent variable.
dependent = cause
independent= effect
What are the metric prefixes in order from smallest to largest?
micro, milli, centi, deci, unit, deca, hector, kilo, hega
define displacement
distance from starting point - vector quantity
Define equilibrium rule
forces up = forces down
define force
push or pull causing change in motion - vector quantity
define friction
force against motion - applied
define net force
overall force on object
define newton
unit of force (1N= 1KgM/s2)
define speed
distance traveled in certain time
define support force or normal force called
opposes gravity
define vector quantity
includes number and direction
(velocity, acceleration, force, and displacement)
define velocity
speed with direction
what does the phrase " frame of reference" refer to ?
what you compare motion to
What is your frame of reference for the following:
A. ground,sidewalk, signs, etc.
b. universe, space
c. earth,stars, etc
In order to start an object in motion, what must you do ?
overcome friction
In order to keep an object moving at a constant velocity (speed and direction), what must you do ?
equal friction
List the 4 forces we discussed. What direction do these forces act?
gravity(down toward center)
support/Normal (up against gravity)
applied (direction of motion)
friction (against motion)
What is the formula for speed?
s=d/t
What are the units for distance, time, and speed?
d= mi,m, km, etc.
t= s, min, hr, etc.
s= mi/hr, m/s, etc.
One the following Position(Distance) vs. Time graph
a. what should the x axis be labeled?
b. what should the y-axis be labeled?
c. what would the magnitude (size) of the slope tell you ?
a. time
b. distance
c. speed
If a car comes to a stop in 3 seconds from 60 miles per hour, what is the car's acceleration
0-60mi/hr/3s
= -20 mi/hr/s
If an object has a net force other than zero, what is happening to the object?
change speed and/or direction
Is a car moving at a constant speed around a circular track accelerating? Why or why not?
yes- changing direction
What is the relationship between force and acceleration (assume that mass remains the same)? Give an example.
direct: push boxes of same mass w/different force, more force= more acceleration
What is the relationship between mass and acceleration( assume that force remains the same) Give an example.
inverse: push more mass w/same force, will accel less
What is newtons 2nd law
f=ma
f=net force
What are the standard units of mass, force, and acceleration?
m=kg
F=N
A=m/s2
What is the difference between mass and weight? Explain what the term losing "weight" really means.
mass=unaffected by gravity
weight= affected by gravity
loose weight= loose mass
What is Newton's 3rd law?
every action has equal and opposite reaction
When you push on a wall with a force of 5 N, what is the wall's response
5N toward you
If the force of a bat against the ball is the action force, what is the reaction?
ball on bat
If the ball pushing on the air is the action force, what is the reaction?
air on ball
Which experiences the greater force, a bug or the windshield it hits?? WHy??
none- the same
define law of universal gravitation
F directly proportional to m1xm2) F inversely proportional to d2.
define inverse square law
F inversely proportional to d2
define gravity
F pulling toward center
What is G?
universal law of gravity constant
What happens to the force of attraction between two objects . If the distance between them is decreased?
decreased distance= increase force
Which has more effect on the tides of the EARTH, THE SUN OR THE MOON? Why
moon-closer
Explain why you can never by truly weightless?
Weight is a measure of F, F is always present (always have mass) so always have weight
Explain why there will always be a force of attraction between two objects
always mass!
Explain why two objects dropped at the same time on Earth may not land at the same time, but those two objects will land at the same time if the experiment was performed on the moon.
moon has no atmosphere, so no air resistance. More surface area= more affected by air resistance
What is the value of acceleration due to gravity. What does this mean?
g=9.8m/s2
in free fall all objects on earth accelerates at 9.8m/s2
