Scientific Method
& CERs
& CERs
Which of the following is a "null hypothesis" for the question: How does a capsule's color affect the time of emergence?
A. There is no relationship between a capsule's color and the time of emergence.
B. The higher the capsule's color alphabetically, the lower the time of emergence.
C. The lower the capsule's color alphabetically, the lower the time of emergence.
D. The higher the capsule's color alphabetically, the higher the time of emergence.
A. There is no relationship between a capsule's color and the time of emergence.
A racing snail is training by "walking" along a ruler. It starts at the 5.0 cm mark and travels in a straight line to the 13.0 cm mark. How far did it travel?
A. 0 cm
B. 5.0 cm
C. 13.0 cm
D. 8.0 cm
D. 8.0 cm
Which of the following is the expression that is used to calculate how fast a dropped object is falling after a time t?
A. 10t
B. 5t^2
C. v/t
D. vt
A. 10t
What is the shape of the "curve" of a velocity vs time graph for an object dropped from rest?
A. a zig-zag.
B. a straight line.
C. a parabola.
D. a step function.
B. a straight line.
One object has twice the mass as another. How fast must it be going to have the amount of momentum?
A. Half the speed
B. The same speed
C. Double the speed
D. Quadruple (4x) the speed
A. Half the speed
Which of the following describes a claim?
A. A guessed answer to a question before you've looked at the data.
B. An answer to a question after you've looked at the data.
C. The data you use to back up your answer to a question.
D. The reason behind the answer to a question.
B. An answer to a question after you've looked at the data.
A student performs the "punch" from today's investigation. Which statement best describes the displacement of the phone along the axis of motion?
A. Starts at zero, goes positive, then negative before returning back to zero.
B. Starts at zero, goes positive, then goes back down to zero.
C. Starts at zero, then goes positive and stays there.
D. Starts positive and doesn't change.
C. Starts at zero, then goes positive and stays there.
Which of the following is the expression that is used to calculate how far a dropped object has fallen after a time t?
A. v/t
B. vt
C. 5t^2
D. 10t
C. 5t^2
A red-tailed hawk is attempting to hover in the sky above a certain point on the ground below. The wind is blowing at 5.0 m/s to the North. What speed and direction must the raptor fly in order to hover?
A. 5.0 m/s to the South.
B. 5.0 m/s to the North.
C. 0 m/s
D. 5.0 m/s to the West.
E. 5.0 m/s to the East.
A. 5.0 m/s to the South.
Momentum is conserved in any collision.
True or False? WRITE THE ENTIRE WORD
True
Which of the following describes evidence?
A. An answer to a question after you've looked at the data.
B. The reason behind the answer to a question.
C. The data you use to back up the answer to a question.
D. A guessed answer to a question before you've looked at the data.
C. The data you use to back up the answer to a question.
Scalars do no have a direction associated with them.
True or False? WRITE THE ENTIRE WORD
True
A car is traveling down a freeway. If it takes [t] hours to go [x] miles, what is the car's average speed in mph?
Variables
Variable Min Max Decimal Places
t 0.1 2 1
x 1 100 0
Formulas
x/t
Possible Solutions
t x Final Answer
1.7 87 51.2 +/- 2%
0.7 81 115.7 +/- 2%
0.9 75 83.3 +/- 2%
0.9 75 83.3 +/- 2%
What is the magnitude of the net force of 4 N to the right with an additional 30 N to the right?
A. 26 N to the right
B. 26 N to the left
C. 34 N to the right
D. 34 N to the left
C. 34 N to the right
You lift 300 N from the ground to a height of 2 meters. How much work did you do?
A. 300 J
B. 0 J
C. 600 J
D. 2 J
C. 600 J
Which of the following describes reasoning?
A. The explanation behind the answer to a question.
B. A guessed answer to a question before you've looked at the data.
C. An answer to a question after you've looked at the data.
D. The data you use to back up the answer to a question.
A. The explanation behind the answer to a question.
A boat is on a river. If the flow of the river is 5.0 m/s, what speed - and in what direction - must the boat go in order to not move relative to the shore?
A. Across the river at any speed.
B. 5.0 m/s upstream (against the current).
C. 5.0 m/s downstream (with the current).
D. 0 m/s
B. 5.0 m/s upstream (against the current).
A person is riding their bike with an average speed of [v] m/s. How many seconds will it take them to go [x] meters?
Variable Min Max Decimal Places
v 5 15 1
x 100 2,000 0
Formulas
x/v
Possible Solutions
v x Final Answer
12.9. 1,040. 80.6 +/- 2%
11.1. 269 24.2 +/- 2%
12.1 1,654 136.7 +/- 2%
12.9. 1,040. 80.6 +/- 2%
When you add paperclips to the bottom of the helicopter, which variable were you increasing the most?
A. Thrust
B. Mass
C. Lift
D. Drag
B. Mass
You lift a 1.5 kg book off the ground to a shelf 2 m high. The book started and ended at rest. What are the PE and KE of the book when it is on the shelf?
A. PE = 0 J, and KE = 3 J
B. PE = 3 J, and KE = 0 J
C. PE = 0 J, and KE = 30 J
D. PE = 30 J, and KE = 0 J
D. PE = 30 J, and KE = 0 J
What is another word for "graph" that spreadsheet programs use?
A. Pie
B. Line
C. Scatter
D. Chart
D. Chart
If a car is moving in the negative direction and is speeding up, the acceleration is...
A. negative
B. positive
C. zero
A. negative
A student walks in one direction for about 100 meters and logs the following data:
Longitude displacement: +0.00060°
Latitude displacement: -0.00005°
Which direction did the student walk?
A. East
B. West
C. Southeast
D. Southwest
A. East
If the velocity of a car is pointed south and the acceleration is pointed north, the car will...
A. Speed up
B. Slow down
C. Change direction
D. Keep a constant acceleration
B. Slow down
A roller coaster is at rest at the top of a hill with 500,000 J of potential energy. It goes downhill; air resistance and friction CANNOT be ignored. What is the KE halfway down the hill?
A. Less than 500,000 J but greater than 250,000 J
B. Less than 250,000 J but greater than 0 J
C. 250,000 J
D. 500,000 J
B. Less than 250,000 J but greater than 0 J