Physics Test Ch 1-6

gisexeru's version from 2016-09-19 18:38

Section 1

Question Answer
Language of science - Equations are guides of thinkingMath
Scientific method1. Recognize problem: 2. Make hypothesis: 3. predict outcome: 4. Exxperiment: 5. Form general rule: 6. Publish ressults
Willingness to admit error. ExperimentationScientific Attitude
A scientific theory MUSTBe falsifiable and consistent with previous theories
basic sciencePhysics
Who discovered that objects of different weights all fall at same speed with no air resistance?Galileo

Section 2

Question Answer
Push or pull on an objectForce
Property of matter to resist changes in motionInertia
Newtons First lawLaw of Inertia - Object in rest stays at rest unless acted upon by force
Combination of force and directionNet force
Size (magnitude) and direction = quantityVector quantity - Arrows - length represents magnitude and arrow head shows direction.
vector sum of forces acting on a non-accelerating object equals zero. EF = 0Equilibrium Rule
Upward force on an object that is opposite to the force of gravitySupport force. Example: book on a table
State of no change with no net force actingEquilibrium
Static equilibriumobject at rest
Dynamic equilibriumobject at constant speed

Section 3

Question Answer
Distance covered per amount of travel time. m/sSpeed
entire distance covered divided by tht total travel timeAverage speed
Description of instantaneous speed of an object and what direction object is goingVelocity
Constant direction (straight line path with no acceleration)Constant Velocity
Change in speed over time and/or change in direction. Acceleration
10 m/sGravity
Proportional to net force and inversely proportioinal to massAcceleration
Force upon an object due to gravity. Measured in Newtons (N)Weight
W = mg or F= (100kg)(10m/ssquared) = 1000N

Section 4

Question Answer
Newton's second law. a = F/m. F=ma = kg x m/s squared = (kg x m/ssquared = NLaw of acceleration.
The greater the mass of the object the greater the force of attraction toward earth. acceleration is the sameFree Fall
Newtons third law.Whenever 1 object exerts a force on a second object, the second object exerts an equal and opposite force on the first. Action and Reaction forces
The force that pushes back up to oppose gravityContact Force

Section 5

Question Answer
Property of moving things. = m x v (mass times velocity)Momentum
force x time or F x t. Example: a brief force applied over a short time interval productes a smaller change in momentum than the same mforce applied over a longer time interval)Impulse
increasing momentumapply the greatest force for as long as possible
Decresing momentumextend time during which momentum is reduced
In the absence of external force, the momentum of a system remains unchanged. Example: cannon firing = both amount of force is exerted on both ball and cannonLaw of Conservation of Momentum
(net mv)before = (net mv)afterCollitions - Net momentum before collision = net momentum after collision
Occurs when colliding objects rebound without lasting deformation. Examplecar at 10 m/s collides with a car at rest of equal mass, (m x 10)before = (2m x V)after = V = 5 m/sElastic Collisions
occurs when colliding objects result in deformationInelastic collisions