Significant figures, SI units, variables, etc
A: Variables
For each of the following investigations, choose the independent and dependent
variables, and write down one variable that would have to be controlled.
1. Investigating the effect of temperature on heart rate.
INDEPENDENT _________________________________________________________
DEPENDENT ___________________________________________________________
CONTROL ______________________________________________________________
2. Investigating the effect of changing mass on the speed at which a car rolls down a
ramp.
INDEPENDENT _________________________________________________________
DEPENDENT ___________________________________________________________
CONTROL ______________________________________________________________
3. Investigating the effect of surface area on the rate of cooling of water.
INDEPENDENT _________________________________________________________
DEPENDENT ___________________________________________________________
CONTROL ______________________________________________________________
4. Investigating the effect of light intensity on the rate of photosynthesis.
INDEPENDENT _________________________________________________________
DEPENDENT ___________________________________________________________
CONTROL ______________________________________________________________
5. Investigating the effect of volume on the rate of dissolving of sugar.
INDEPENDENT _________________________________________________________
DEPENDENT ___________________________________________________________
CONTROL ______________________________________________________________
B: Apparatus and Units
Give the name of a piece of apparatus you would use to measure the following quantities,
and the correct units of measurement.
1.
How long it takes to run around the perimeter of a soccer field.
APPARATUS _____________________________
2.
The height of your teacher.
APPARATUS _____________________________
3.
UNIT _________________
The thickness of a microscope slide.
APPARATUS _____________________________
10.
UNIT _________________
The diameter of a ping pong ball.
APPARATUS _____________________________
9.
UNIT _________________
The area of a piece of paper.
APPARATUS _____________________________
8.
UNIT _________________
The volume of an unknown liquid left in a beaker in the lab.
APPARATUS _____________________________
7.
UNIT _________________
The distance from your house to school.
APPARATUS _____________________________
6.
UNIT _________________
The temperature of a mug of hot chocolate.
APPARATUS _____________________________
5.
UNIT _________________
The mass of a 10 peso coin.
APPARATUS _____________________________
4.
UNIT _________________
UNIT _________________
The volume of a stone.
APPARATUS _____________________________
UNIT _________________
C: Significant figures
1. Write down how many significant figures there are in each of the following:
560.0075
__________________
75000 ____________________
43.00
__________________
2.23
0.00334
__________________
6.50908 ____________________
0.90909
__________________
0.0004 ____________________
1290000
__________________
1.0
____________________
____________________
2. Calculate the following, giving your answers to an appropriate number of significant
figures.
459cm x 22cm __________________________________________________________
3.426m x 0.785m ______________________________________________________
1900g / 5.52g __________________________________________________________
1.967cm + 6.54cm _______________________________________________________
87kg – 22.5kg __________________________________________________________
D: Conversions
Convert the following quantities into the new units stated.
a) 0.135 km = ______________________ m
b) 691 cm = ______________________ km
c) 2.44 kg = ______________________ g
d) 276 J = ______________________ kJ
e) 10.8 m = ______________________ mm
E: Scientific Notation
Write each of your answers to section D in scientific notation.
a) ___________________________ m
b) ____________________________ km
c) ___________________________ g
d) ___________________________ kJ
e) ___________________________ mm