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# Science Final

### Finished

QuestionAnswer
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