Variables
How does the amount of fertilizer affect plant growth?
Independent Variable?
Dependent Variable?
Controlled Variable?
Independent Variable: amount of fertilizer
Dependent Variable: plant growth
Controlled Variable: type of plant, type of fertilizer, any growing conditions
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Pseudoscience
Label observation or inference:
1. The sky appears blue.
2. The pen fell to the ground when I dropped it.
3. George is wearing a coat because he is cold.
4. Ms. Franks is drinking coffee because she couldn't sleep last night.
1. Observation
2. Observation
3. Inference
4. Inference
Selena, Steve and Martin ride in the elevator together to the 7th floor. Selena ________ in motion relative to Steve and Martin. Selena ________ in motion relative to people on the first floor.
Selena, Steve and Martin ride in the elevator together to the 7th floor. Selena IS NOT in motion relative to Steve and Martin. Selena IS in motion relative to people on the first floor.
Sally swims across a swimming pool that is 0.025 km long. She completes the swim in 40 seconds. Calculate her swimming speed in meters per second (m/s).
s= ?
d=0.025km = 25m
t= 40 s
s=d/t
s=25m/40s
s=0.625m/s
If a nail is exposed to a saltwater solution then it will rust quickly.
Independent Variable?
Dependent Variable?
Controlled Variable?
Independent Variable: saltwater solution or no saltwater solution
Dependent Variable: Speed of rusting
Controlled Variable: Name material, size of nail
Science or Pseudoscience
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Science
Classify as quantitative or qualitative:
1. The pencil is 17 cm long.
2. The music is loud.
3. The car traveled 25o miles in 3 hours.
4. The cake tastes sweet.
1. quantitative
2.qualitative
3. quantitative
4. qualitative
How are velocity and speed different?
Velocity and speed both measure the rate of motion and both have the same units.
Velocity indicates the direction and speed does not.
A car is traveling at a speed of 60 kilometers per hour (km/h) for 2.5 hours. How far has the car traveled?
s= 60km/hr
d=?
t= 2.5hrs
d=t*s
d=2.5hr*60km/hr
d= 150km
IV: different paper towel brands
DV: amount of water absorbed
Write the research question and hypothesis.
How does the brand of paper towel affect the amount of water absorbed?
If Bounty paper towels are used then they will absorb more water.
1: Convert 3.5 kilometers to meters.
2: Convert 2.8 decimeters to centimeters.
3: Convert 750 millimeters to centimeters.
4: Convert 4.3 hectometers to millimeters.
1: 3,500 meters
2: 28 centimeters
3: 75 centimeters
4: 430,000 millimeters.
List the following units as speed, distance, time or acceleration.
m/s km
m hours
s mi/hr2
m/s2 cm/ms
speed: m/s and cm/ms
distance: m and km
time: s and hour
acceleration: m/s2 and mi/hr2
Explain the difference between average and instantaneous speed.
Average speed is calculated. It occurs over a length of time.
Instantaneous speed is the speed at an instant in time. For example, a car's speedometer.
A cyclist travels a distance of 45 kilometers at a speed of 15 kilometers per hour. How long does it take the cyclist to complete the journey?
s= 15km/hr
d=45km
t= ?
t=d/s
t=45km/15km/hr
t=3hr
Does watering flowers with sugar water cause them to bloom faster?
Write the research question, hypothesis and variables.
How does watering flowers with sugar water affect the speed with which the flowers bloom?
If the flowers are watered with sugar water then they will bloom faster.
IV: sugar water or no sugar water
DV: speed that flowers bloom
CV: type of flower, flower location
What are the three ways that an object can accelerate?
1. speed up
2. slow down
3. turn
Is acceleration occurring?
1. A biker slows down while riding up a hill.
2. A kid spins in a circle.
3. A car comes to a stop
4. A person walks at 3m/s down a straight path.
1. yes
2.yes
3. yes
4. no
The variable that the researcher changes is the ____________ while the results of the experiments are the _________________.
The variable that the researcher changes is the INDEPENDENT VARIABLE while the results of the experiments are the DEPENDENT VARIABLE.
A car is initially at rest. It accelerates for 10 seconds and reaches a final velocity of 30 m/s. What is the car's acceleration during this time?
Vi: 0m/s Vf: 30m/s t:10s a:?
a=(Vf-Vi)/t
a=(30m/s-0m/s)/10s
a=3m/s2