Term
State, discuss, and give examples of Newton's first law of motion 

Definition
1stlaw of inertia an object at rest and an object in motion at constant speed and sirection will remain so unless acted upon by a net external force a=0 inertia is a resistance to an object's change in velocity ex: pulling a table cloth out from under dishes 


Term
State, discuss, and give examples of Newton's second law of motion 

Definition
2nd lawFnet=ma, if there is a net force on a mass it must be accelerating if Fnet=0, a=0 if you keep mass constant, F proportional to a if you keep force constant, m proportional to 1/a force is defined as the act necessary to make a mass accelerate lineraly ex: pushing a block along a table 


Term
State, discuss, and give examples of Newton's third law of motion 

Definition
3rdactionreaction, forces occur in equal and opposite pairs(on and by) ex: aforce BY earth ON moon rforce ON earth BY moon external force only concered with ON forces 


Term
Compare the velocity in the x and ydirection for projectile motion 

Definition
inital velocity has both x and ycomponents xcomponent of velocity stays constant, no a in the xdirection Vx=VocosΘ
ycomponent at top Vy=0 then increase in the negative direction from that point Vy=VosinΘgt 


Term
using velocity vectors, describe the motion of a ball in projectile motion 

Definition
velocity has an x and ycomponent Vo also has x and yparts xcomponent always stays constant, but y part increases, reaches 0 at the top, and increases again but in the negative direction 


Term
How long does it take a ball in two dimensions to reach the top of its path? One dimension? Why are they different? 

Definition
2D: ttop=VosinΘ/g
1D: ttoop=Vo/g
Difference: Because in 1D motion v=0 at the top..in 2D motion, Vy=0, but Vx=constant, so V does not =0 have to consider the angle Θ 


Term
what is a free body diagram? 

Definition
pictorial representation used to analyze the forces acting on a body of interest 


Term
Are mass and weight the same thing? how is weight calculated? 

Definition
No, mass is quantity of matter in an object or the measure of an objects inertion
weight is the mass of an object times the gravitational pull of an object W=mg 


Term

Definition
a resistance to an object's change in velocity 


Term

Definition
the act necessary to make a mass accelerate lineraly 


Term

Definition
the force resisting the relative motion of surfaces sliding against each other dependent on types of materials and normal force f=µN 


Term

Definition
force perpendicular to a surface force BY resting surface ON object 


Term
Define coefficient of friction 

Definition
a dimensionless scalar value which describes the ratio of the force of friction between two bodies and the force pressing them together
depends on the materials used 


Term
Why does the equation for x not have g in the equation? 

Definition
Hooke's Law: F=kΔx
because F proportional to x, constant is spring constant, k 


Term
Incline at angle Θ, what are components of weight parallel and perpendicular to the incline? 

Definition
parallelmgsinΘ
perpendicularmgcosΘ 


Term
If an object is at rest, what is known about that object? 

Definition


Term
What are the forces acting on a kicked football at the top of its path? 

Definition
g is straight down towards earth, there is air drag (f)in the opposite direction of velocity 


Term
When Fnet is constant, how are m and a related? 

Definition


Term
When m is constant, how are Fnet and a related? 

Definition


Term
compare static and kinetic friction 

Definition
fs is always larger than fk, it cannot be quantified except at fsmax
fk can be quantified, it stays constant
when fs reaches its maximum point, it drops off to fk then becomes a constant fk 


Term
What makes a car go fast? 

Definition
acceleration is a vector, change in speed or change in direction gas pedal, steering wheel, etc 


Term
Can one pull themselves up by the boot straps? 

Definition
No, because in order to have acceleration there MUST be a net external force acting on the object
(Force on you by you cannot happen) 


Term
Determine the actionreaction forces for Janet, Chair, and Keyboard 

Definition
A:Force BY janet ON chair R:Force ON janet BY chair
A:Force BY janet ON keyboard R:Force ON janet BY keyboard 


Term
When is the normal force equal to the weight of the object? Not equal? 

Definition
On a flat surface
On an incline or when being pushed or pulled 


Term
Why is a box more difficult to push than pull? 

Definition
When pushing, normal force is weight plus force component, which makes N larger
When pulling, N is mg minus force component, makes N smaller and therefore easier 


Term
Determine your mass in kg (1kg=2.2lb) 

Definition


Term
What keeps your book from falling through the table? 

Definition
Newton's law of motion explain it no a, Fnet=0, because force up (N) is equal to force down (W) 


Term

Definition
means if there is a net force acting on a mass that it must be accelerating 


Term
If an object has zero acceleration, are there no forces acting upon it? 

Definition
No, there may be forces acting on it that add to zero (N and mg=0) 


Term
If a brick is thrown through a window, describe the forces on the brick and the window. 

Definition
ActionReaction forces, equal and opposite (NEVER cancel bc they act on different objects) A:Force BY brick ON window R:Force ON brick BY window 


Term
Person jumps out of an airplane with a parachute. Describe the forces acting on the person, including friction 

Definition
mg down towards earth, friction up from the parachute and air drag 


Term
Why is it a good idea to wear seat belts in cars? 

Definition
If you slam on the breaks, F is throwing you forwards, friction from the seat belt will be a force acting opposite the force of your body forwards 


Term
Measure the coefficient of friction for a block of wood on a peice of wood 

Definition
Fnet=ma, at constant speed Fnet=0 


Term

Definition
15641642 evidence of experimentally discovering laws of nature book: "Dialogue of the Two Cheif World Systems" born in Italy, wrote in Italian and had his book mass produced, house arrest and blind for last several years of his life 


Term

Definition
16421727 discovered the laws of nature using mathematics wrote "Principa" elected a member of parliament, made warden of mint and introduced ridges on coins, remained active in mind and body until death but had emotional breakdowns 

