What it Does & How it Changes
Variable, Variable, Variable
Its in Motion
Its all In the Measurements
Graphs & Problems
100
In your car this device will show your instantaneous speed
What is the speedometer?
100
The variable vo represents _________________ and has SI base units of ____________.
What is initial velocity and meters per second or m/s?
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
In your car this device will show the total distance your car has traveled since it hit the road.
What is the odometer?
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
If the acceleration is in the same direction as the velocity, the object will?
What is speed up?
300
When finding speed we can use the v=d/t formula but d represents ______________ vs when finding velocity using the v=d/t formula the d will represent _____________.
What is total distance traveled (path length) and displacement (how far and in what direction has the object been moved along a straight line from the starting location to the ending location).
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
If an object is moving left and is slowing down, the velocity is ______________ and the acceleration is ______________.
What is negative and positive? As the object travels left the velocity is negative. In order for it to slow down the acceleration must be in the opposite direction of the velocity vector, in this case the acceleration must be positive.
400
In order to describe the position or motion of any object, I must first define the ______________ I am using since this changes the way the motion is perceived.
What is a frame of reference? Please keep in mind that the best frame of reference is a stationary object or landmark. If the frame of reference is moving then all we will get is a relative difference between the motion of the object and the motion of the 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 25 km and a displacement of 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
If the cheetah's dinner is standing still 10 meters away from the cheetah while the cheetah is moving toward dinner at 5 m/s, how long will it take the cheetah to catch its dinner? (assuming the dinner continues to stand still and doesn't run away)
What is t = d/s t= 10/5 t = 2 seconds
500
The Greek letter delta looks like a triangle, in a math formula it means the _____________ in the variable it precedes. Specifically the ______________ minus the ____________ value of that variable.
What is change, final value, and initial value (in that order)?
500
In your car there are 3 devices that control acceleration of the car.
What are gas pedal (makes you speed up) brake (makes you slow down) and steering wheel (makes you change direction)
500
A student walks 15 meters west and then 15 meters north where they stop to talk to a friend. The magnitude and direction of the student's displacement when they stop is ______________.
What is 21.21 m @ 45 degrees North of West or 21.21 m Northwest of their original location. We have two legs of a right triangle, so we can use Pythagorean theorem. a^2 + b^2 = c^2 so c = sqrt (15^2 + 15^2) when the legs are equal in length we have a 45, 45, 90 triangle. We discussed this in class when we looked at making a diagonal across a square.
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?
a = (vf-vo)/t a= (5 - 0)/20 a= 0.25 m/s^2
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