ODU

Question 1

What is an acceleration time graph like for a velocity time graph that is a straight horizontal line➡️?

Answer 1

Nothing/no line.

Question 2

What is an displacement time graph like for a velocity time graph that is a straight horizontal line➡️?

Answer 2

A straight constant line and slopping upwards from left to right.↗️

Question 3

What is an acceleration time graph like for a velocity time graph that is a straight constant line sloping upwards from left to right↗️?

Answer 3

A straight horizontal line above the x axis.➡️

Question 4

What is an displacement time graph like for a velocity time graph that is a straight constant line sloping upwards from left to right↗️?

Answer 4

A mountain curving inwards sloping upwards from left to right.⤴️

Question 5

What is an acceleration time graph like for a velocity time graph that is a straight constant line sloping downwards from left to right↙️?

Answer 5

A straight horizontalline below the x axis.➡️

Question 6

What is an displacement time graph like for a velocity time graph that is a straight constant line sloping downwards from left to right↙️?

Answer 6

Half an igloo curving outwards and sloping upwards from left to right

Question 7

What does the gradient of a displacement - time graph give?

Answer 7

The velocity of the object.

Question 8

What does the gradient of a velocity time graph give?

Answer 8

The acceleration of the object.

Question 9

What does the area under the velocity time graph give?

Answer 9

The displacement.

Question 10

What is Newton’s 1st law?

Answer 10

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.

Question 11

What is Newton’s second law?

Answer 11

The force acting on an object is the sum of the acceleration times the mass of the object.

Question 12

What is Newtown’s third law?

Answer 12

For every action there is an equal and opposite reaction.

Question 13

What is terminal velocity?

Answer 13

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.

Question 14

What is the statement for the conservation of energy?

Answer 14

Energy cannot be destroyed or created, it can only be changed from one form into another.

Question 15

What is the statement for the conservation of momentum?

Answer 15

The total momentum before a collision is equal to the total momentum after a collision.

Question 16

What is an elastic collision?

Answer 16

Where the TOTAL kinetic energy before is equal to the TOTAL kinetic energy after the collision.

Question 17

What is an inelastic collision?

Answer 17

Where the TOTAL kinetic energy after is less than the Total kinetic energy before the collision.

Question 18

What is the impulse of a force equal to?

Answer 18

The area under a force-time graph and is equal to the change in momentum of an object involved in the interaction.

Question 19

What are the horizontal motion and the vertical motion of a projectile of each other?

Answer 19

Independent of each other.

Question 20

What is a projectile?

Answer 20

An object which is influenced only by the downward force of gravity.

Question 21

For the horizontal motion of a projectile do you use cos or sin?

Answer 21

Cos

Question 22

For the vertical motion of a projectile do you use cos or sin?

Answer 22

Sin

Question 23

What are satellites in around a star/planet?

Answer 23

Free fall

Question 24

What is the speed of light in a vacuum for all observers?

Answer 24

The same.

Question 25

What does the Doppler effect cause?

Answer 25

Shifts in wavelength of light and sound.

Question 26

For the Doppler effect equation is an object moving towards + or -?

Answer 26

-

Question 27

For the Doppler effect equation is an object moving away + or -?

Answer 27

+

Question 28

If light is redshifted is it moving towards or away from an observer?

Answer 28

Away

Question 29

If light is blue-shifted is it moving towards or away from an observer?

Answer 29

Towards

Question 30

In the equation z=v/c what does v stand for?

Answer 30

The recessional velocity of the galaxy.

Question 31

What does bubbles law allow us to calculate?

Answer 31

The age of the universe.

Question 32

What does the measurements of the velocities of galaxies and their distance from us lead to?

Answer 32

The theory of the expanding universe.

Question 33

How can the mass of galaxies be estimated?

Answer 33

By the orbital speed of stars within it.

Question 34

Where does the evidence supporting the existence of dark matter come from?

Answer 34

Estimation of the mass of galaxies.

Question 35

Where does the evidence supporting the existence of dark energy come from?

Answer 35

The accelerating rate of the expansion of the universe.

Question 36

What is the temperature of stellar objects related to?

Answer 36

The distribution of emmited radiation over a wide range of wavelengths.

Question 37

What is the peak wavelength for hotter objects than for cooler objects?

Answer 37

Smaller

Question 38

What do hotter objects emit more of than cooler objects?

Answer 38

More radiation per unit surface area per unit time.

Question 39

What is evidence supporting the Big Bang theory and subsequent expansion of the Universe?

Answer 39

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.