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What's that Word?
Variable, Variable, Variable
Its in Motion
Its all In the Measurements
Graphs & Problems
100
Describes information gained by using your senses.
What is an observation?
100
A general term used to represent any part or item in an experiment that CAN CHANGE. (example the amount of water, time, or temperature). In math class and when we do math problems in science this term refers to the letter that represents a physical quantity or unknown value in an equation. (example: t for time or T for temperature)
What is a variable?
100
Numerical results must ALWAYS be accompanied by a __________.
What is a unit?
100
Scientists use this system of units to conveniently communicate measurements to one another. This system is based on powers of ten so it makes conversions really easy.
What are SI units or what is metric system?
100
Johnny uses a meter stick to record a distance of 8 cm. The SI base unit is a meter. So he would record his answer as _________ m.
What is 0.08 meters or 0.08m? Recall there are 100 cm in a meter several ways to convert - from the reading packet - method 1 what you have times the multiplying factor 8cm x .01 m = 0.08 m method 2 from the conversion page 11 8cm x 1m/100cm = 0.08 m
200
A student is trying to determine if a particular shampoo will be better at preventing fleas on their dog. Their father breeds miniature poodles and agrees to let them conduct an experiment on the most recent batch of puppies. Four puppies are selected and each puppy is washed with a different dog shampoo. The number of fleas are counted each week. In this experiment the types of dog shampoo represents this.
What is an independent variable?
200
The part of the experiment that I the scientist change.
What is the independent or manipulated variable?
200
10 m is an example of a _________________. While 15 m East is an example of _______________.
What is distance (10 m) and displacement (15 m East)? NOTICE THAT DISPLACEMENT HAS A DIRECTION ATTACHED!!!
200
This is the base unit scientists use when measuring a length.
What is a meter?
200
On a graph of distance versus time the slope represents.
What is speed?
300
Generally written as IF ... Then.... This is an "educated guess" or a prediction of an experimental results which is based on background knowledge or research.
What is a hypothesis?
300
In this type of experiment only one variable can be changed by the scientist. One or more things may have measurable changes as a result of the change the scientist makes. However, it is important that the scientist only makes 1 purposeful change or they cannot determine a cause and effect between what they changed and the changes they measure in their dependent variable.
What is a controlled experiment?
300
One big difference between speed and velocity is that velocity must have a ________________ associated with it.
What is a direction?
300
This doesn't seem like a base unit because it has a metric pre-fix. However, scientists most commonly use this unit when making a measurement of mass.
What is a kilogram?
300
On a distance versus time graph the steeper the slope the ____________ the object is moving.
What is faster?
400
In an experiment this is something that does not change, it is purposefully kept the same. Often times it is a little confusing because tests will use two different words for this same thing.
What is a control? or What is a constant?
400
Position, observer or object which is used to describe the motion of one object relative to another. (Hint: if you describe the motion relative to different positions/observers the motion may appear to be different)
What is a frame of reference?
400
An object which does one or more of these things will be an object that is accelerating.
What is speeds up, slows down and/or CHANGES DIRECTION?
400
A student walks 10 km North, 5 km west, and 10 km South. The distance traveled is ____________ and their displacement is __________.
What is distance traveled of (10 + 5 + 10) 25 km Notice that the measurements form 3 sides of a box leaving you 5 km west of your starting location so the displacement is 5 km west.
400
On a distance versus time graph a flat or horizontal line represents.
What is an object which is stationary, not moving or at 0 velocity?
500
A group which is used as a comparison or standard. (often represents the "normal condition" in a biological or chemical experiment)
What is a control group?
500
A scientist who changes their data to fit their hypothesis or randomly discards information that does not match their expectations, is showing ___________.
What is bias?
500
In your car there are 3 devices that control acceleration, 1 device that shows your instantaneous speed, and one device that shows your total distance traveled.
What is acceleration: gas pedal (makes you speed up), brake (makes you slow down), and steering wheel (makes you change direction) instantaneous speed: speedometer distance traveled: odometer
500
In the metric system we can use a prefix to represent each of the following multiplying factors: 1,000 0.01 and 0.001.
What is kilo, centi, milli?
500
A cheetah starts at rest and accelerates to 5 m/s in 20 seconds. What is the cheetah's acceleration during that time period? If the cheetah's dinner is 10 meters away and it keeps running at 5 m/s, assuming the dinner does not move, how long will it take the cheetah to catch its dinner?
a = (vf-vo)/t a= (5 - 0)/20 a= 0.25 m/s^2 t = d/s t= 10/5 t = 2 seconds