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Science Final
Finished
| Question | Answer |
|---|---|
| How are balanced and unbalanced forces related to motion? | If forces are unbalanced, it will cause motion (if net force is greater than 0) |
| What is friction? | The force one surface exerts on another when the two surfaces rub against each other |
| What factors determine the friction force between two surfaces? | Types of surfaces, how hard the surfaces push together |
| What is Newton’s First Law of Motion? | An object at rest stays at rest and an object in motion stays in motion unless acted on by an unbalanced force |
| What is Newton’s Second Law of Motion? | The acceleration of an object as produced by a net force is directly proportional to the magnitude of the next force and inversely proportional to the mass of the object |
| What is Newton’s Third Law of Motion? | For every action, there is an equal and opposite reaction |
| What effect does gravity have on an object in free-fall? | It pulls it towards earth at -9.8 m/s |
| What effect does air resistance have on an object in free-fall? | No effect, because only gravity is acting on it |
| What is momentum? | Quantity of motion, describes the energy of a moving mass |
| How does pressure change with altitude? | The higher up, the less pressure |
| How does pressure change with depth? | The deeper, the more pressure |
| How does force affect pressure? | More force, more pressure |
| How does area affect pressure? | More area, less pressure |
| What does Archimedes’ Principle state? | Buoyant force on an object is equal to the weight of the fluid displaced by the object |
| How is Archimedes’ Principle related to buoyancy? | If the weight of an object is greater than the weight of the displaced fluid, the object will sink. If the weight of the object is equal to the weight of the displaced fluid, the object will float |
| What does Bernoulli’s principle state? | Pressure exerted by a moving stream of fluid is less than the pressure of the surrounding fluid |
| How is Bernoulli’s principle related to flight? | Air above an airplane wing is moving faster than the air below the wing. This cause the plane to increase in its elevation. |
| When is work done on an object? | When a force is used to move an object |
| What are the two basic kinds of energy? Describe them | Potential and kinetic, potential energy is the stored energy and kinetic energy is the energy of motion |
| What are the several different forms of energy? | Mechanical, thermal, chemical, electrical, electromagnetic, nuclear |
| What are the three methods of heat transfer? | Conduction, convection, radiation |
| How do insulators affect heat transfer? | Insulators do not transfer heat easily |
| How do conductors affect heat transfer? | Conductors transfer heat easily |
| What is temperature? | Measure of the average kinetic energy of the individual particles in an object |
| What is temperature’s relationship to particle movement? | The higher the temperature, the faster the particles are moving |
| An 100kg football player is running 10m/s. What is his momentum? | 1000kg*m/s |
| A bullet is .004kg and is traveling at 600m/s. What is its momentum? | 2.4kg*m/s |
| What type of heat transfer is this? Warming a room with a radiator | Convection |
| What type of heat transfer is this? Making popcorn in the microwave | Radiation |
| What type of heat transfer is this? Cooking soup in a pot | Conduction |
| What forces are acting on a book on a table? Are they balanced or unbalanced? | The table is pushing up, gravity is cancelling it by pushing down (balanced) |
| Brady is pushing a book on a table. What forces are acting on the book? Are they balanced or unbalanced? | Brady is pushing the book, friction is opposing it (unbalanced), the table is pushing up on the book, but gravity is cancelling it by pushing down(balanced) |
Created by:
leahsklar
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