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Section 1

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Efficiency

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Physics

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Date created

Mar 1, 2020

Cards (31)

Section 1

(31 cards)

Efficiency

Front

The ration of the useful energy output to the total energy input

Back

What is the most common type of motion?

Front

Accelerated motion

Back

Vector Quantity

Front

A vector Quantity indicates "how much" (the magnitude) and the direction of the quantity. If something is a vector quantity you must determine the magnitude and the direction. Vector, in physics, a quantity that has both magnitude and direction. It is typically represented by an arrow whose direction is the same as that of the quantity and whose length is proportional to the quantity's magnitude.

Back

Displacement

Front

Vector Quantity, measurement of the change in distance and the direction or the change in position of an object from a reference point. Direction is indicated.

Back

Force

Front

push or pull applied to an object; measured in newtons

Back

kinetic energy

Front

energy due to the motion of an object

Back

First law of thermodynamics

Front

The total amount of energy, including heat, in a system and its surroundings always remans constant

Back

What is the simplest type of motion?

Front

Uniform motion

Back

Sustainable

Front

process that will not compromise future generations

Back

Law of conservation of energy

Front

Energy can never be created nor destroyed but can be converted from on form to another

Back

Average Speed

Front

A term used to describe uniform motion that involves travelling a distance in a specified time. Average Speed = distance travelled/ time elapsed v = d/t or v = df - di/ tf - ti

Back

what are the two ways negative acceleration occurs?

Front

1) when the change in the magnitude of the velocity is negative while the direction is positive 2) when the change in the magnitude of the velocity is positive and the direction is negative

Back

Work

Front

a measure of the amount of energy transferred from one object to another when an object moves against an opposing force or the speed of an object increases; calculated by multiplying the force acting on an object by the distance the object travels W = force x distance the object travels (w =fd)

Back

When would work input equal work output?

Front

When there is an absence of outside forces (friction)

Back

What is the work input or energy input?

Front

When a force is applied to move an object through a distance, work is done on the object (W=Fd)

Back

what are the three conditions for work to be done on an object?

Front

1) There must be movement 2) There must be force 3) The force and the distance the object travels must be in the same direction

Back

Acceleration

Front

change in velocity during a specific time interval, type of motion, vector quantity acceleration = change in velocity/ time interval a = v/t where v = vf - vi vf is the final velocity and vi is the starting velocity

Back

What are the two ways positive acceleration occurs?

Front

1) when the change in both the magnitude of the velocity and the direction are positive 2) when the change in both the magnitude of the velocity and the direction are negative

Back

What are the two types of graphs that can be used to describe uniform motion?

Front

distance-time graph and a speed-time graph

Back

Magnitude

Front

size, extent of something

Back

Scalar Quantity

Front

A scalar quantity is one that only indicates "how much"(the magnitude) of the quantity.

Back

Distance travelled

Front

Scalar Quantity, measurement of the change in distance of an object moving from a starting reference point

Back

Potential Energy

Front

energy due to the position of an object relative to another object (eg; gravitational potential energy results from an objects position relative to Earths surface)

Back

Energy

Front

Energy is the ability to do work. Work and energy are the same thing.

Back

heat

Front

the transfer of thermal energy

Back

What is the difference between speed and velocity?

Front

Speed is a scalar quantity and velocity is a vector quantity

Back

Uniform Motion

Front

A term used to describe an object that is travelling at a constant rate of motion in a straight line.

Back

Motion

Front

An object occurs when an imaginary line joining the object to the reference point changes in length or direction or both

Back

Cogeneration

Front

using the waste energy from one process to power another process

Back

Velocity

Front

describes both the rate of motion and the direction of an object average velocity = displacement/ time elapsed

Back

Second law of thermodynamics

Front

heat flows naturally from hot to cold objects and in the process can be made to do work; during this process some energy is always lost as heat

Back