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Ms. Hunter Semester Test 2
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Gravity
Terms in this set (56)
Who? The buoyancy shown by ducks and other water flow.
Archemedies'
Who? Why umbrellas turn inside out.
Bernoulli's
Who? Why water squirts from the top of an open plastic bottle when its is squeezed.
Pascal's
What kind of friction occurs as fish swims through water?
Fluid friction
What is the formula to calculate speed?
S=d/t
Acceleration can occur if there is a change in___________or_________.
speed and direction
What is the Universal Law of Gravitation?
Every object attracts every other object.
How will increasing the mass of one object affect the force of attraction between the two objects?
Increasing the mass will increase the attraction.
How will increasing the distance between two objects affect the force of attraction between two objects?
Increasing the distance will decrease the attraction force.
What is a reference point?
A basis or standard.
Hydraulics would be an example of which principle?
Pascal's
What are the units for length, velocity, acceleration, momentum, force, and energy?
m, m/s, m/s^2, kgm/s, N, J
Birds flying is explained by who's principle?
Bernoulli's
The slope of a distance vs. time graph would be_____________.
Velocity
The slop of a speed vs. time graph would be___________________.
Acceleration
Convert 400 meters to km.
.4 km
Convert .000078 kg to mg.
78 mg
What is one example of Newton's First law of motion?
Playing ping-pong.
What is one example of Newton's Second law of motion?
Newton's cradle
What is one example of Newton's Third law of motion?
Leaning on a wall
The pressure of a fluid at a specific depth depends on what two things?
Density and depth.
You can show the motion of speed on a line graph by plotting what two variables? On which axis would you plot them?
Distance on the x axis & time on the y axis.
Give some examples of vector quantities.
Acceleration, velocity, momentum, and force.
What two variables would you plot if you were graphing acceleration and on which axis would you plot them?
Speed on y axis & time on x axis.
What is Sir Isaac Newton known for?
His laws of motion.
Write of following in scientific notation; A: 280,000 B: .0000076.
A: 2.8x10^5 B: 7.6x10^-6
What is the equation for calculating momentum?
P=mv
What is a conversion factor? Give an example.
Converting on measurement to another. 24in. ---> 2ft.
What do these prefixes equal? Kilo, centi, milli, micro, nano, Mega, and Hecto.
1000, .01, .001, .000001, .000000001, 1000000, 100
Which law (Newton)? A person sitting in a boat tosses a heavy anchor in one direction. The boat moves in the opposite direction.
3rd
Which law (Newton)? A car skids on an icy curve.
1st
Which law (Newton)? An athlete can throw a baseball farther than a shot-putt.
2nd
A book placed vertically on one side rather than on the flat side exerts more pressure on the table. Which principle would apply? Explain.
Pascal's. With less area covered, it applies more pressure.
Stored energy or energy due to position is know as what?
Potential energy
The formula for calculating potential energy is what?
Ep=mgh
The three factors that determine the amount of potential energy in an object are what?
Height, mass, and acceleration.
Potential and Kinetic energy is measured in what?
Joules
For force and energy, mass must be measured in units of what?
kg
Energy of a compound that changes as its atoms are rearranged to form new compounds is what?
Chemical energy
The total energy of all the particles that make up an object is called what?
Thermal energy
The value of the g constant (the acceleration of all objects due to gravity) on earth is what?
9.8m/s^2
Height is measured in what?
meters
Energy of motion is known as what?
Kinetic energy
What is the formula for kinetic energy?
Ek=1/2(mv^2) or Ek=.5(mv^2)
The two factors that determine the amount of kinetic energy in a object are what?
Velocity & mass
Velocity is measured in what?
m/s
Which has seconds squared? Velocity or acceleration?
Acceleration
The SI (metric) unit for energy is what and what is the symbol?
Joules, J
The thermal energy of a substance changes with the ___________of its particle.
motion
An____________________________is a change from one form of energy into another.
energy conversion
What force always opposes motion?
Friction
As an object falls freely, the kinetic energy of the object does what?
Increases
The equation, E=mc^2 proposed by the scientist ___________ ___________ and the 'c' represents the_______________________.
Albert Enstein & Speed of light
If the velocity of an object doubles, its kinetic energy does what?
Quantuples
A Ferris wheel moving at constant speed is accelerating because the Ferris wheel is doing what?
Changing direction
Name one contribution of each scientist. Galileo, Archimedes, Bernoulli, Aristotle, Pascal, and Einstein.
Discovered Earth went around the Sun, Buoyancy, Air pressure, made discoveries through observation, Hydraulics, and Special Theory of Relativity.
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