S5 - Physics Unit 1

Question 1

How do you find the vertical component when resolving vectors?

Answer 1

v x sinθ

Question 2

How do you find the horizontal component when resolving vectors?

Answer 2

v x cosθ

Question 3

What does the direction of motion graph look like?

Answer 3

Question 4

What does a velocity time graph look like when an object is moving at a constant velocity?

Answer 4

Question 5

What does a velocity time graph look like when an object is constantly accelerating?

Answer 5

Question 6

What does a velocity time graph look like when an object is constantly decelerating?

Answer 6

Question 7

Describe what is happening in the graph:

Answer 7

An object is decelerating , reaching a stop, and then accelerating

Question 8

What does an acceleration-time graph with an object at a constant velocity look like?

Answer 8

Question 9

What does an acceleration-time graph with an object constantly accelerating up / decelerating down look like?

Answer 9

Question 10

What does an acceleration-time graph with an object constantly accelerating down / decelerating up look like?

Answer 10

Question 11

What does a displacement-time graph with a constant acceleration look like?

Answer 11

Question 12

What does a displacement-time graph with a constant deceleration look like?

Answer 12

Question 13

Describe what is happening in the graph:

Answer 13

An object moving up reaching its maximum displacement, then moving back down to where it started

Question 14

What does the area under a v-t graph equate to?

Answer 14

Displacement/distance

Question 15

What does the area under a s-t graph equate to?

Answer 15

Nothing

Question 16

What does the area under an a-t graph equate to?

Answer 16

Velocity

Question 17

What is Newton’s first law?

Answer 17

An object will remain at rest or move in a straight line with a constant velocity unless it is acted on by an unbalanced force

Question 18

What is Newton’s second law?

Answer 18

When an unbalanced force is acting on an object it will accelerate/decelerate

Question 19

What is Newton’s third law?

Answer 19

Every action has an opposite but equal reaction

Question 20

What is the equation for when a lift is:
- accelerating up
- decelerating down
- accelerating down
- decelerating up
- at a constant speed

Answer 20

S = W + ma
S = W + ma
S = W - ma
S = W - ma
S = W

Question 21

What is the symbol for “parallel”?

Answer 21

∥ (two lines)

Question 22

What is the symbol for “perpendicular”?

Answer 22

⊥ (an upside down T)

Question 23

What equation do you use in a question when the forces are parallel to the object on a slope?

Answer 23

F∥ = mg x sinθ

Question 24

What equation do you use in a question when the forces are perpendicular to the object on a slope?

Answer 24

F⊥ = mg x cosθ

Question 25

Label the diagram:

Answer 25

Question 26

What is momentum - a vector or scalar?

Answer 26

A vector

Question 27

What is the symbol for momentum and what equation can you use to find it?

Answer 27

p p=mv

Question 28

What does the law of conservation state?

Answer 28

When two objets collide, the total momentum before and after the collision are equal

Question 29

What equation can be used to find the mass or velocity of either of the objects before or after a collision?

Answer 29

m₁v₁ + m₂v₂= m₃v₃+ m₄v₄

Question 30

What does it mean if a collision is elastic?

Answer 30

The Ek before the collision is = to the Ek after the collision

Question 31

What does it mean if a collision inelastic?

Answer 31

The Ek before the collision is ≠ to the Ek after the collision

Question 32

What is the symbol for impulse?

Answer 32

Ft

Question 33

What is the definition for impulse?

Answer 33

The force applied to an object over a time

Question 34

What is the equation to find impulse?

Answer 34

Ft = mv - mu

Question 35

What is the equation relating to Newton's law of gravitation?

Answer 35

F = G m₁m₂ / r²

Question 36

What is G?

Answer 36

Gravitational constant

Question 37

When is the + and - used in the doppler effect equation?

Answer 37

Towards (bad) = - Away (good) = +

Question 38

What does red shift prove?

Answer 38

That the universe is constantly expanding and accelerating away from a single point

Question 39

What is the symbol for red shift?

Answer 39

z

Question 40

What is the equation for redshift?

Answer 40

z = λ(observed) - λ(rest) / λ(rest)

Question 41

What are other pieces of evidence that support the Big Bang Theory?

Answer 41

- CMB radiation - Olbers paradox - Abundance of H and He

Question 42

What is the symbols for Hubble's constant?

Answer 42

Ho

Question 43

What is the formula including Hubble's constant?

Answer 43

v = Ho x d

Question 44

What is redshift?

Answer 44

The wavelength of light emitted by galaxies increasing into the red section of the visible spectrum as they accelerate away from earth

Question 45

How does the Olber's paradox prove the universe is expanding?

Answer 45

The light from stars in the night sky haven't reached us yet because the universe had a beginning and since then has expanded

Question 46

How does CMB radiation prove the universe is expanding?

Answer 46

Because CMBR was left over from the big bang but was originally gamma radiation with short wavelengths before it turned into microwave radiation with longer wavelengths

Question 47

What is the doppler effect?

Answer 47

The change in frequency observed when a source of sound waves moves relative to an observer