# level: Level 1

## Questions and Answers List

### level questions: Level 1

Question | Answer |
---|---|

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 |

What is the fundamental unit of time | seconds |

What is the fundamental unit of measurment | meters |

3 ways an object can change its motion | Speed up, Slow down or Change Directions |

What is the fundamental unit of mass | The KG |

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 |

What is the symbol for average speed | Delta V |

who was the first person to describe speed in a mathematical way | galileo |

Define Instantaneous speed | The 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 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 |

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 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 |