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# Physics Final

### Physics Final (6/6)

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

A stationary point that allows observers to see motion because the distance between the object and this changes. | Reference point |

The distance traveled in a certain amount of time (how fast) | Speed |

What is the unit for speed? | m/sec |

The speed at a certain instant of time | Instantaneous speed |

Traveling equal distances in equal amounts of time | Constant speed |

The total distance traveled in a certain amount of time | Average speed |

The speed in a certain direction (how fast and which way) | Velocity |

If Lauren can run 15 meters in 10 seconds, what is her speed? | 1.5 m/s |

Covering equal distances in equal amounts of time without changing direction | Constant velocity |

Any change in velocity | Acceleration |

A car accelerates from rest to a final speed of 10m/s in 5 seconds. What is the acceleration of the car? | 2 m/sec/sec |

A car speeds up from 10 m/s to 20 m/s in 4 seconds. What is the acceleration of the car? | 2.5 m/sec/sec |

A car slows down from a speed of 25 m/s to 10 m/s in 3 seconds. What is the acceleration of the car? | -5 m/sec/sec |

A car is traveling at 10 m/s. How much time will it take to accelerate to a final speed of 30 m/s if it can accelerate at 4 m/s? | 5 seconds |

A car that is at rest begins to accelerate at 5 m/sec/sec. What is the car's speed after 6 seconds? | 30 m/s |

A car that is traveling at 10 m/s begins to accelerate at 5 m/sec/sec. What is the car's speed after 6 seconds? | 40 m/s |

A car accelerates from rest at 4 m/sec/sec. Calculate the distance traveled after 0 seconds. | 0 m |

A car accelerates from rest at 4 m/sec/sec. Calculate the distance traveled after 2 seconds. | 8 m |

A car accelerates from rest at 4 m/sec/sec. Calculate the distance traveled after 3 seconds. | 18 m |

A car accelerates from rest at 4 m/sec/sec. Calculate the distance traveled after 10 seconds. | 200 m |

A car accelerates from rest at 4 m/sec/sec. Calculate the final velocity after 0 seconds. | 0 m/s |

A car accelerates from rest at 4 m/sec/sec. Calculate the final velocity after 2 seconds. | 8 m/s |

A car accelerates from rest at 4 m/sec/sec. Calculate the final velocity after 3 seconds. | 12 m/s |

A car accelerates from rest at 4 m/sec/sec. Calculate the final velocity after 10 seconds. | 40 m/s |

If the slope on a distance vs time graph is flat, that means the object is...? a) Not moving b) Constant speed c) Acceleration | A |

If the slope on an acceleration vs time graph is flat, that means the object is...? a) Not moving b) Constant acceleration | B |

If the slope on a velocity vs time graph is slanted, that means the object is...? a) Constant speed b) Acceleration | B |

If the slope on a velocity vs time graph is flat, that means the object is...? a) Constant speed b) Acceleration | A |

If the slope on a distance vs time graph is curved, that means the object is...? a) Not moving b) Constant speed c) Acceleration | C |

If the slope on a distance vs time graph is slanted, that means the object is...? a) Not moving b) Constant speed c) Acceleration | B |

The slope of a distance vs time graph shows _________. | Speed |

The slope of a velocity vs time graph shows _____________. | Acceleration |

Any push or pull of an object | Force |

The unit for force is__________. | Newtons |

The overall force on an object | Net force |

Shows all the forces acting on the object | Force diagram |

A nonzero net force that causes an object to accelerate | Unbalanced force |

A zero net force that does not cause an object to accelerate | Balanced force |

The amount of matter in an object | Mass |

The force of gravity pulling on an object | Weight |

Weight = mass * _________ | Gravity |

When you go to the moon, your __________ (mass/weight) stays the same. | Mass |

A force that opposes motion and slows down moving objects | Friction |

If the texture of a surface is rough, that means that there is _________ (more/less) friction | More |

The two forms of friction are ________________ and _______________, which means that one is stationary and the other is moving, respectfully. | Static; kinetic |

The three types of kinetic friction are ______________, __________________, and _______________, where in one, a surface slides over another, in the second, a surface rolls over another, and in the third, a surface moves through a fluid. | Sliding friction; rolling friction; fluid friction |

When the only force acting on an object is gravity. | Free fall |

If two different objects of different mass are dropped from the same height, the ________________ (will/will not) fall to the ground at the same time because they are in free fall. | Will |

Suppose a basketball is dropped from rest from a very, very high tower. What is its acceleration after 5 seconds? | 9.8 m/sec/sec |

Suppose a basketball is dropped from rest from a very, very high tower. What is its velocity after 5 seconds? | 49 m/s |

When the downward force of gravity is cancelled out by the upward force of air resistance; the object no longer accelerates. It moves at a constant speed | Terminal velocity |

An object that is in free fall and moves horizontally at the same time | Projectile |

The ability to do work or cause change | Energy |

What are the two forms of energy? | Kinetic; potential |

What are the three types of potential energy? | Gravitational; elastic; chemical |

What is the formula for KE? | 1/2mv^2 |

What is the unit for energy? | Joules |

What is the formula for GPE? | mgh |

How much kinetic energy does a 0.15 baseball have if its speed is 40 m/s? | 120 J |

How much gravitational potential energy is stored in a 0.15 baseball if it is held 2m off the ground? | 2.943 J |

What law is this? Energy cannot be created or destroyed, but it can be transformed from one form to another | Law of Conservation of Energy |

What are the six forms of energy? (List in the order as in the acronym MENCHE) | Mechanical; electromagnetic; nuclear; chemical; heat; electrical |

What form of energy is this? Energy that's stored in the nucleus of an atom Sun:Fusion-2 nuclei collide together at high speeds, releasing energy as they fuse together Power plants:Fission-nucleus breaks into 2 or more nuclei which releases energy | Nuclear |

What form of energy is this? Energy that is stored in the chemical bonds between atoms (food, batteries, burning coal, gasoline) | Chemical |

What form of energy is this? Energy associated with moving electric charges (batteries, power plants sending electric currents, laptop sending electrical signals through circuits, brain controls body through electrical impulses) | Electrical |

What form of energy is this? Energy associated with the temperature of an object. Moving particles produce heat energy through friction (chemical reactions, heating/cooling surroundings, change in the state of matter) | Heat |

What form of energy is this? Energy that is carried in massless waves that are part electric and part magnetic (visible light, invisible inferred heat waves, invisible x-rays) | Electromagnetic |

What form of energy is this? Energy associated with the motion or position of an object (living a mass, running, kicking a football) | Mechanical |

What principle is this? The buoyant force on an object is equal to the weight of the fluid displaced by that object | Archimedes' Principle |

Suppose you jump into a pool. What is the volume of water you displace if you go halfway under? | 1/2 your volume |

Suppose you jump into a pool and go all the way under. What is the buoyant force? | The weight of you |

If an object has the same volume as water, but it weights more, it will _____. | Sink |

If the object ______, the object weights less than that much water. | Floats |

What principle is this? As the speed of a moving fluid increases, the pressure inside of that fluid decreases? | Bernoulli's Principle |

The pressure inside a moving fluid is ___________ (more than/less than) the pressure of the surrounding slower moving or stationary fluid. | Less than |

Which of Newton's laws is this? (Just put number) • Objects at rest stay at rest • Object in motion stay in motion • All of the above unless acted on by an unbalanced force with makes it accelerate • Also known as the Law of Inertia | 1 |

Which of Newton's laws is this? (Just put number) • For every action, there is an equal and opposite reaction force • Action/reaction force pairs DO NOT cancel out because they act on different objects | 3 |

Which of Newton's laws is this? (Just put number) • Describes the relationship between force, mass, and acceleration • If the force is constant, then as mass increases, the acceleration decreases • F=ma | 2 |

What law is this? Opposite charges attract, while like charges repel. | Law of Electric Charges |

For positive charges, the arrows point ____________ (out/in) | Out |

The quantity that keeps an object in its state of motion | Momentum |

The formula for momentum is: | P=mv |

The unit for momentum is: | Kg * m/s |

What is the momentum of a 5 Kg cart traveling at a velocity of 3 m/s? | 15 Kg * m/s |

A force of attraction or repulsion between two types of metals (Ni, Fe, or Co) caused by the identical spin of electrons within each substance | Magnetic force |

The magnetic force depends on: | Size + distance |

The average kinetic energy of all the molecules in a substance | Temperature |

The movement of thermal energy from one substance to another | Heat |

The transfer of thermal energy by direct contact | Conduction |

Easily transfer thermal energy | Conductors |

Do not easily transfer thermal energy | Insulators |

The transfer of thermal energy by electromagnetic waves | Radiation |

The transfer of thermal energy by the movement of currents in a fluid | Convection |

When heated, objects __________ (expand/contract) | Expand |