1st Semester test Flashcards
The prefix kilo Means
1000
What involves the study of matter and it’s motion through space and time
Physics
The correct symbol for the SI unit of temp is
(K) kelvin
The SI unit that is used to measure time is
Second
The variable plotted on the horizontal or x Axis is called
Independent variable
How many meter are there in 1865 cm
18.65
The best type of graph to use to show how some fixed quantity is broken Down into parts is
Circle graph
A beaker contains .32L of water what is the volume of this water in milliliters
320mL
Another term for technology is
Applied science
The process if gathering information through the senses is called
Observation
When designing an experiment the first step is to
State the problem
A factor manipulated in an experiment to change the dependent variable is the
Independent variable
A rule or principle that describes what happens in nature is _____
Scientific law
What is a system of knowledge and the methods used do find that knowledge
Science
An explanation of an event that is based on repeated observations and experiments is a _______
Theory
The building blocks of matter
Atoms
An idea, event, or object can be represented by a _______ to help people better understand it
Model
A standard for comparison that helps to ensure that the experimental result is caused by the condition being tested is the _____
Control
A factor in an experiment that change from the manipulation of the independent variable is the_______
Dependent variable
A factor that does not change in the experiment
Constant
Motion is a change in
Position
3 m/s north is an example of a
Velocity
A merry-go-round horse moves at a constant speed but a changing______
Velocity
Acceleration is a rate of change of
Velocity
A horizontal line on a velocity/time graph shows_____
Same speed
Inertia varies depending on
Mass
Newton’s first law of motion is also called the law of_____
Inertia
What is the speed of a bobsled whose distance-time graph indicates that it traveled 100m in 25s
2 m/s^2
Suppose you increase your walking speed from 1 m/s to 3 m/s in a period of 1s what the Accerlation
2m/s^2
Te upward force on an object falling through the air is ______
Air resistance
The relationship among mass, force, and acceleration is explained by ______
Newtons 2 law of motion
A feather will fall through the air more slowly than a brick because of_______
Air resistance
The acceleration due to gravity is
9.8 m\s^2
According to newtons 2 law of motion
F=m•a
When an object moves in a circular path, it Accerelates toward the center if the circle as a result of
Centripetal force
The path if a projectile is ______
Curved
For any object, the greater the force that’s applied to it, the greater it______ will be
Acceleration
The size of the gravitational force between two objects depends in their _________
Masses and the distance between them
When a force is exerted on a box, an equal and opposite force is exerted by the box. These forces are called?
Action-reaction
The statement “to every action there is an equal and opposite reaction” is_________
Newton’s third law of motion
A 300-N force acts on a 25-kg object. The acerelation of the object is
12 m/s^2
The SI unit of force is the
Newton
When an unbalanced force acts on an objects
The object accelerates
What is the momentum of a 50- kilogram ice skater gliding across the ice at a speed of 5 m/s
250 kg• m/s
The rate at which work is done is called
Power
The unit of power
Watt
If you exert a force of 10 N to lift a box a distance of .9 m, how much work do you do?
9J
The kinetic energy of an object increases as it_______ increases
Velocity
The SI unit for energy
Joule
A bus engine transfer chemical potential energy into _______ so that the bus moves
Kinetic energy
In a nuclear fusion reaction, mass Is transferred into______
Energy
According to the law if conservation of energy, the total amount of energy in the universe _____
Is never created or destroyed but change forms
A material that reduces the flow of heat by conduction, convention and radiation is _____
An insulator
The transfer if energy that does big require matter is ________
Radiation
Energy from the sun travels to earth as________
Radiant energy
The process by which engine fuels burn is called
Combustion
A device that converts thermal energy into mechanical energy is a____________
Heat engine
The energy of motion is called?
Kinetic energy
A small 20-kilogram canoe Is floating downriver at a speed of 2 m/s. What is the canoes kinetic energy?
40J
An objects graviton all potential energy is not directly related to which if the following
It’s speed
A 4- kilogram cat is resting on top of a bookshelf that is 3 meters high. What is the cats gravitational potential energy relative to the floor if the acceleration due to gravity 9.8 m/s^2
118J
Which of the following increase when an object becomes warmer
Thermal energy
The energy stored in gasoline is
Chemical energy
The mechanical energy of an object equals it______
Kinetic energy plus it’s potential energy
Fossil fuels currently account for the majority of the worlds energy use because they are______
Relatively inexpensive and readily available
Heat is the transfer of thermal energy from one object to another because of a difference In_______
Temperature
What property of an object is related go the average kinetic energy if the particles in that object?
Temp
The formula Q= m•c•
C
The specific heat of copper is .385 J/g•C* which equation would you use to calculate the amount of heat needed to raise the temp of .75g of copper from 7C to 29C
Q= .75 g• .385J/gC •22C
Matter that has a definite volume and a definite shape is a
Solid
Has a definite volume but no for sure shape
Liquid
Most matter________ when heated
Expands
The theoretical point at which all molecular motion stops is called
Absolute 0
The SI unit for pressure
Pascal
Which of the following states bernollis principle
As the speed of a fluid increases the pressure within the fluid decreases
Which substance will float in corn syrup
Glycerin
According to ________ the buoyant force on an object in a fluid is = to the weight of the fluid displaces by the object
Archimedes
The velocity of a fluid increases the pressure exerted by the fluid decreases
Bernoullis principle
