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Phys Science Final
Final Exam
| Question | Answer |
|---|---|
| _________is the direction from the starting point and the length of a straight line from the starting point to the ending point | Displacement |
| _________is the speed and direction in which an object is moving. | Velocity |
| _________is the rate at which velocity changes | Acceleration |
| A bicycle rider increases his speed from 5 m/s to 15 m/s in 10 seconds. What is its acceleration? | a= Vf - Vi / t 15-5/10= 1 |
| How much time does it take for a bird flying at a speed of 45 miles per hour to travel a distance of 1,800 miles? | t= d/v 1,800/45= 40hours |
| _______is a push or pull that acts on an object | Force |
| Whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first object | Newton's Second Law of Motion |
| The tendency of an object to resist a change in its motion | Inertia |
| The state of motion of an object does not change as ling as the net force acting on the object is zero | Newton's First Law of Motion |
| As you press down on your paper, the paper is pressing back on you equally and oppositely. Which law describes this? | Newton's Second Law of Motion |
| If no net force acts on a system, then the total momentum of the system does not change. | Newton's Third Law of Motion |
| ________states a change in pressure at any point in a fluid is transmitted equally and unchanged in all directions throughout the fluid | Pascal's Principle |
| _______ states that as the speed of a moving fluid increases, its pressure decreases. | Bernoulli's Principle |
| _______states the buoyant force on an object is equal to the weight of the fluid displaced. | Archimedes Principle |
| Calculate the pressure exerted on an elevator floor which is 2 meters deep and 3 meters wide, if 20 people whose combined weight is 1500N are standing on it. | P = F/A 1500/6= 250 |
| An elephant that weighs 40,000N stands on one leg during a circus performance. The area on the bottom of the elephant's foot is 0.4 m2. How much pressure is exerted on the elephant's foot? | P = F/A 40,000/.4= 100,000 |
| A big boat can float because___________ | The buoyant force is pushing up on the boat |
| Which would have more pressure with the same force? | A needle |
| ________is the ability to do work. | Energy |
| What is the potential energy of a boulder that is 45m above the ground that has a mass of 50 kg? | PE= mgh 50*9.81*45= 22,072.5 N |
| _________is the energy that is stored as a result of position or shape. | Potential Energy |
| This principle would help you if you wanted to see if someone tricked you. If you gave someone gold to make a crown and they purposely added some silver so they could keep some of the gold, this principle could prove they cheated you! | Archimedes Principle |
| This is a device that uses a pressurized fluid on pistons of different sizes to increase force | Hydraulic System |
| What is the kinetic energy of a car that has a mass of 30 kg and a velocity of 60 m/s? | KE = m * v2/2 30 * 3600/2= 54,000 N |
| ________is the product of a force over a distance | Work |
| ________is the rate of doing work | power |
| Which is a device that changes force? | simple machine |
| _________is the force exerted by a machine | output force |
| This is the force exerted on a machine. This force is done by a person. | Input force |
| ________is the percentage of the work input that becomes work output in a machine. | efficiency |
| In this lever the fulcrum is always located between the input and output force | First class lever |
| In this lever, the output force is located between the input force and the fulcrum. | second class lever |
| The input force is located between the fulcrum and the output force in this lever | third class lever |
| This is the V-shaped object whose sides are two inclined planes sloped toward each other | wedge |
| _________is the inclined plane wrapped around a cylinder | screw |
| Which is a simple machine that consists of a rope that fits into a groove in a wheel? | pulley |
| _________is a combination of two or more simple machines that operate together | Compound machine |
| F= 200 Newtons d= 50 meters W= ? | W= F*d 200 * 50= 10,000 J |
| A steam engine is an _________ and engine that burns fuel outside the engine | External Combustion Engine |
| _________ is the transfer of thermal energy in a fluid by the movement of warmer and cooler fluid from place to place | conduction |
| _____occurs when a fluid circulates in a loop as it alternately heats up and cools down | convection |
| ______is the transfer of energy by the electromagnetic waves. | radiation |
| Thermal energy, heat and work are related and the study of the relationship among them is called __________. | Thermodynamics |
| _______is defined as a temperature of 0 Kelvins | Absolute zero |
| _________are packets of electromagnetic energy that exists in light | photons |
| The transfer of energy by electromagnetic waves traveling through matter or across space is called ____________. | electromagnetic radiation |
| _______ occurs when two or more waves overlap and combine together | interference |
| An _____in a region of space exerts electric forces on charged particles. | electric field |
| A _______ in a region of space produces magnetic forces | magnetic field |
| An area where the particles in a medium spread out in a longitudinal wave is called a __________. | rarefaction |
| The ________is a unit that compares the intensity of different sounds | decibels |
| A ________is a wave that appears to stay in one place | standing wave |
| ___________is a physical response to the intensity of sound, modified by physical factors | loudness |
| _________ are transverse waves consisting of changing electric fields and changing magnetic fields. | electromagnetic waves |
| The process in which white light separates into colors is called | dispersion |
| __________are three specific colors that can be combined in varying amounts to create all possible colors | primary colors |
| __________of light is a combination of two primary colors | Secondary colors |
| ________colors of light are any two colors that combine to form white light | complementary colors |
| A________is a material that absorbs some colors of light | pigment |
| _________of pigments-any two colors of pigments that combine to make black pigment | complementary colors |
| Objects that give their own light are__________ | luminous |
| The light produced when an object gets hot enough to glow is____________ | incandescent |
| A ______is a solid material that can emit light by causing a phosphor to steadily emit photons | phosphor |
| Light in which waves have the same wavelength, and the crests and troughs are lined up, is__________ | coherent light |
Created by:
aemiller
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