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level: Level 1

Questions and Answers List

level questions: Level 1

What is the study of physics?What will happen next
What topics does physics cover?Force, Motion, Heat, Energy, Light and sound
What range of atom size does physics coverquarks, neutrinos, atoms to the VERY LARGE planets, stars, galaxies
Why is Nicholas Copernicus significant?Proposed that the earth orbit around the sun & the rotation of earth causes sunrises/sunsets
Why was Newton Significant?3 Laws of motion, and the idea of gravity
Why was galileo significantLaw of falling bodies- things fall at the same rate regardless of mass AND (dropped things off of buildings) Once an object is in motion, it stays in motion
Newtowns first law of motion1- every object in a state of uniform motion, will stay in motion until an unbalanced force acts upon it
Newtons second law of motionForce equals mass times acceleration
Newtons third law of motionFor every action, there is an equal and opposite reaction
What is the fundamental unit of timeseconds
What is the fundamental unit of measurmentmeters
3 ways an object can change its motionSpeed up, Slow down or Change Directions
What is the fundamental unit of massThe KG
Scientific Method OrderObservation, Hypothesis, Predict, Test prediction, Conclusions
What is a frame of reference?A position relative to the origin, usually described by co-ordinates (can be fixed or moving)
What are scalar quantities?A distance/speed/force/acceleration with NO direction
What are vector quantities?A speed/force/acceleration or distance WITH a direction
What factors can affect a moving object?Wind/Gravity/other forces or factors
what categories of motion did aristotle classify?Natural and Violent
What did aristotle contribute?Categories of motion/ Motion is due to on objects desrie to return to its natural palce
When is something considered 'accelerating'when it change speed or direction
What is the amount of inertia deoendant on?The amount of mass in the object - the more more matter the more inertia
Define mass- The amount of matter found in an object - A measure of the inertia an object has in resisting a change to its motion
Define wieghtThe force of gravity on an object. Weight is measured in Newtons
What is 1 Newton?The amount of force required to accelerate 1kg of mass in 1 m/s2
Relationship between mass and weightThey are proportional, one is halved so is the other
How to find wieght in Newtons from Mass in KgThe mass X 9.8 = Weight in N
What is a force?A push or pull that causes an object to speed up, slow down or change direction (causes an object to accelerate)
What does the term net force mean?Used to describe ALL the forces in play on an object
Vector quantities have both _____ and _______Magnitude and direction
What does a net force of zero imply?that an objects state of motion is being unchanged (can be at rest OR a constant speed) Object is at equilibrium
Define equilibriumThe object is in a state of no change
Define static equilibriumThe object is at a constant state of rest
Define dynamic equilibriumThe object is moving in a straight line at a constant speed
What does the amount of friction depend on?The objects involved, the surface and how hard the objects are being pressed together
What is the formula for average speed?Total distance over total time
What is the symbol for average speedDelta V
who was the first person to describe speed in a mathematical waygalileo
Define Instantaneous speedThe speed of an object at that direct moment in time
Is velocity a vector or scalar term?Vector
What is velocity?How fast something is going in a direction
What is constant velocity?Constant speed in a constant direction with no acceleration
What is the formula for acceleration ?a= v2-v1 divided by t
what units is acceleration answered inMeters per seconds squared (m/s2)
The distance an object free-falls is directly proportional to______________The square of the time it falls
define centripetal accelerationAcceleration of an object moving in a circular path
Formula for centripital accelerationAc = V2 divided by radius
what is the scientific unit for force?Newtowns
What is the key concept of Newtons mechanics of motion?Force
what is the most common force used in our lives?Weight
Define static frictionPresent when their is no relative motion between two objects
Define Kinetic FrictionPresent when there is relative motion between two objects
What does wieght equal in (N)Mass X Gravity
A force acting sideways on a moving object causes what?Centripetal Acceleration
Equation for Centripetal Force?Fc = mv2 divided by r
What is air resistance dependent on?The speed and surface area of the object