for the test yk

Question 1

first question for the diagram

Answer 1

x is friction

y is gravity

downwards speed increases

reaches terminal velocity

Question 2

when the parachute is released

Answer 2

friction increases

air resistance suddenly increases to bigger than the gravity due to increase in surface area

drag also increases

Question 3

cycle question

Answer 3

friction and air resistance

Question 4

cycle 6 marker

Answer 4

x to y
at x, friction is greater than force air resistance

cyclist accelerates and therefore velocity increases. as cyclists moves towards y, air resistance increases and therefore accelerates at a slower rate and velocity still increases but at a slower rate

y to z
from y to z, air resistance increases and acceleration decreases. cyclist then reaches terminal velocity

Question 5

Red shift qs

Answer 5

definition:moving away

Question 6

red shift 4 marker

Answer 6

We can tell the universe is still expanding because we can see that the galaxies that are further away are giving off the biggest red shift. The galaxies that are the furthest away are the ones that are moving the fastest. This all suggests that the universe may have had an origin point which we know is the big bang

Question 7

big bang evidence

Answer 7

cosmic mircrowave background radiation

Question 8

momentum is conserved

Answer 8

momentum stays the same

Question 9

protection in the big fight

Answer 9

it reduces the force on the person as it increases the collision time