Exam on June 21, 2016 Flashcards
What is Newton’s 1st law called? 2
This law is often called
“the law of inertia”.
An object in motion will remain in motion with the same speed and in the same direction unless acted upon by an unbalanced force. An object at rest will remain at rest unless acted on by an unbalanced force.
What does this mean?
This means that there is a natural tendency of objects to keep on doing what they’re doing. All objects resist changes in their state of motion. In the absence of an unbalanced force, an object in motion will maintain this state of motion.
What is Newton’s 2nd law called? 2
Acceleration is produced when a force acts on a mass. The greater the mass (of the object being accelerated) the greater the amount of force needed (to accelerate the object).
FORCE = MASS times ACCELERATION
What does this mean?
Everyone unconsiously knows the Second Law. Everyone knows that heavier objects require more force to move the same distance as lighter objects.
What is Newton’s 3rd law called?
For every action there is an equal and opposite re-action.
What does this mean?
This means that for every force there is a reaction force that is equal in size, but opposite in direction. That is to say that whenever an object pushes another object it gets pushed back in the opposite direction equally hard.
What is a Thermometer? and how does it work?
A thermometer measures the temperature. It is a device that has alcohol is a vacuumed tube in which the liquid will rise due to warm water expands, as the temperature increases, As the temperature decreases, the liquid will fall down because cold water is more denser than warm water
What is a Barometer? and how does it work?
A barmeter measures the atmospheric pressure. It is a device that is about 3 feet high with one end open and the other end sealed. It is a device that uses mercury. To keep the mercury stable, we put oil in top of the mercury. It measures the atmospheric pressure by using the same concept of a thermometer, but instead of temperature, it relies on how much pressure there are in the surrounding place. The mercury would expand as the pressure increases and mellow down as the atmospheric pressure is low.
How does the angle of the Earth affect the seasons?
Thanks to the angle of the Earth, winter affects, depending on how the earth is facing, will affect only the Northern hemisphere. AS we experience winter in the Northern hemisphere, the southern hemisphere is experiencing a warm summer.
What are the 3 main influences on ocean current patterns?
Coriolis Effect,
Continents,
Wind
During the northern hemisphere’s winter, what Pole would experience 24 hours of sunlight?
The South Pole
What is distance a quantity of?
A scalar
What is displacement a quantity of?
A vector quantity
What is a vector? 4
Are measurements that tell us the magnitude of the quantity being measured and the direction over which it is being measured.
The symbols see to denote vectors are usually letters with a small arrow above them.
Vectors can be added, subtracted and divided, etc. But must be modified to the process being used according to the direction attached to the quantity. YOU CAN’T TREAT VECTORS LIKE regular numbers
Vectors the tells us “how many” and “where”
What is a scalar? 4
Are measurements that tells us only the magnitude of the quantity being measured
Scalars numbers tell us “how many”
The symbols used to denote scalars are usually letters.
Scalars can be added, subtracted, multiplied and divided, etc. JUST LIKE REGULAR NUMBERS
What is distance? 3
a scalar quantity that measures the space of an object as it moves through our 3 dimensional world
Is equal to the sum of the distances moved in any and all spatial dimensions/directions
Measured in SI base units called metres (m)
What is velocity a quantity of?
It is a vector quantity
What is speed? 2
Is a scalar quantity that measures how far an object travels (distance) in a given time
Expressed in SI units called metres per second (ms-1)
