Physics Test 1
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Physics Test 1 - Marcador
Physics Test 1 - Detalles
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Preguntas:
56 preguntas
| 🇬🇧 | 🇬🇧 |
| 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 cover | Quarks, 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 significant | Law 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 motion | 1- every object in a state of uniform motion, will stay in motion until an unbalanced force acts upon it |
| Newtons second law of motion | Force equals mass times acceleration |
| Newtons third law of motion | For every action, there is an equal and opposite reaction |
| 3 ways an object can change its motion | Speed up, Slow down or Change Directions |
| Scientific Method Order | Observation, 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 wieght | The 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 weight | They are proportional, one is halved so is the other |
| How to find wieght in Newtons from Mass in Kg | The 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 equilibrium | The object is in a state of no change |
| Define static equilibrium | The object is at a constant state of rest |
| Define dynamic equilibrium | The 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 |
| Define Instantaneous speed | The speed of an object at that direct moment in time |
| 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 in | Meters per seconds squared (m/s2) |
| The distance an object free-falls is directly proportional to______________ | The square of the time it falls |
| Define centripetal acceleration | Acceleration of an object moving in a circular path |
| Formula for centripital acceleration | Ac = V2 divided by radius |
| Define static friction | Present when their is no relative motion between two objects |
| Define Kinetic Friction | Present 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 |