ODU Flashcards
What is an acceleration time graph like for a velocity time graph that is a straight horizontal line➡️?
Nothing/no line.
What is an displacement time graph like for a velocity time graph that is a straight horizontal line➡️?
A straight constant line and slopping upwards from left to right.↗️
What is an acceleration time graph like for a velocity time graph that is a straight constant line sloping upwards from left to right↗️?
A straight horizontal line above the x axis.➡️
What is an displacement time graph like for a velocity time graph that is a straight constant line sloping upwards from left to right↗️?
A mountain curving inwards sloping upwards from left to right.⤴️
What is an acceleration time graph like for a velocity time graph that is a straight constant line sloping downwards from left to right↙️?
A straight horizontalline below the x axis.➡️
What is an displacement time graph like for a velocity time graph that is a straight constant line sloping downwards from left to right↙️?
Half an igloo curving outwards and sloping upwards from left to right
What does the gradient of a displacement - time graph give?
The velocity of the object.
What does the gradient of a velocity time graph give?
The acceleration of the object.
What does the area under the velocity time graph give?
The displacement.
What is Newton’s 1st law?
An object will remain at rest or continue to move in a straight line at a constant speed unless acted upon by an unbalanced force.
What is Newton’s second law?
The force acting on an object is the sum of the acceleration times the mass of the object.
What is Newtown’s third law?
For every action there is an equal and opposite reaction.
What is terminal velocity?
When the two forces (air resistance and weight) acting on normally a sky diver are equal and the velocity is constant and at the maximum velocity which could possibly be reached.
What is the statement for the conservation of energy?
Energy cannot be destroyed or created, it can only be changed from one form into another.
What is the statement for the conservation of momentum?
The total momentum before a collision is equal to the total momentum after a collision.
What is an elastic collision?
Where the TOTAL kinetic energy before is equal to the TOTAL kinetic energy after the collision.
What is an inelastic collision?
Where the TOTAL kinetic energy after is less than the Total kinetic energy before the collision.
What is the impulse of a force equal to?
The area under a force-time graph and is equal to the change in momentum of an object involved in the interaction.
What are the horizontal motion and the vertical motion of a projectile of each other?
Independent of each other.
What is a projectile?
An object which is influenced only by the downward force of gravity.
For the horizontal motion of a projectile do you use cos or sin?
Cos
For the vertical motion of a projectile do you use cos or sin?
Sin
What are satellites in around a star/planet?
Free fall
What is the speed of light in a vacuum for all observers?
The same.
What does the Doppler effect cause?
Shifts in wavelength of light and sound.
For the Doppler effect equation is an object moving towards + or -?
-
For the Doppler effect equation is an object moving away + or -?
+
If light is redshifted is it moving towards or away from an observer?
Away
If light is blue-shifted is it moving towards or away from an observer?
Towards
In the equation z=v/c what does v stand for?
The recessional velocity of the galaxy.
What does bubbles law allow us to calculate?
The age of the universe.
What does the measurements of the velocities of galaxies and their distance from us lead to?
The theory of the expanding universe.
How can the mass of galaxies be estimated?
By the orbital speed of stars within it.
Where does the evidence supporting the existence of dark matter come from?
Estimation of the mass of galaxies.
Where does the evidence supporting the existence of dark energy come from?
The accelerating rate of the expansion of the universe.
What is the temperature of stellar objects related to?
The distribution of emmited radiation over a wide range of wavelengths.
What is the peak wavelength for hotter objects than for cooler objects?
Smaller
What do hotter objects emit more of than cooler objects?
More radiation per unit surface area per unit time.
What is evidence supporting the Big Bang theory and subsequent expansion of the Universe?
Cosmic microwave background radiation, the abundance of the elements hydrogen and helium, the darkness of the sky (Olbers’ paradox) and the large number of galaxies showing redshift rather than blueshift.
