pp

Question 1

Explain how evaporation cools the water

Answer 1

MP1. temperature proportional to (average
kinetic) energy;
MP2. idea that particles leave the surface /
escape the liquid / turn into a gas;
MP3. highest energy particles leave the liquid;
MP4. idea that (average kinetic) energy of
(remaining particles in) liquid is reduced;

Question 2

as speed inc. — inc

Answer 2

drag

Question 3

1 N = — g

Answer 3

100

Question 4

more accurate data hookes experiment

Answer 4

• finer callibration
• ignore parallax error
• keep near ruler
• more weights/intervals during curve part
• more readings
• make sure spring stationary before reading

Question 5

WHy wont it calc. the correct speed?

SPEED

Answer 5

ny one of the following ideas;
o speed might have increased / changed on slope
o car might have accelerated
o other forces could be acting

NOT AVG SPEEDDD

Question 6

(c) The student concludes that the spring shows elastic behaviour.
Explain what is meant by the term elastic behaviour.

Answer 6

returns to original length / shape;
when (stretching) force is removed;

Question 7

why travel farther on moon

Answer 7

less drag