UB25 Physics Post Test

Below is a graph of position versus time data. Draw lines from each term, on the left, to its location(s) in the graph on the right.

a

b

c

d

Maximum Position

x-axis

Minimum Position

y-axis

This graph shows the temperature in a room throughout a day. How long did it take for the temperature to go from maximum to minimum? What was the average (mean) temperature during that time? Circle the best answer combination.

• A. 6 hours; 26.8 °C

• B. 6 hours; 26.6 °C

• C. 8 hours; 26.8 °C

• D. 8 hours; 26.6 °C

Tags

NGSS.MS-PS3-1

Billy is standing on a bridge above a river. He takes a small pebble, about the size of a bean, drops it from the side of the bridge and counts the time it takes for the pebble to hit the water: 2 seconds. How long do you think Billy will have to count if he drops a larger rock, about the size of a baseball? Circle your prediction.

• A. Longer than 2 seconds.

• B. Shorter than 2 seconds.

• C. 2 seconds.

Explain your thinking. Is there a "rule" you used to determine the answer?

Tags

NGSS.MS-ETS1-2

NGSS.MS-LS2-4

NGSS.MS-PS3-5

A car, stopped at a red light, has a velocity of 0 m/s. When the light turns green, the car speeds up for 2 s to a velocity of 10 m/s. What was the car's acceleration while it was speeding up? Circle the best answer.

• A. Acceleration = 10 m/s × 2 s = 20 m

• B. Acceleration = 10 m/s - 2 s = 8 m/s

• C. Acceleration = (10 m/s - 0 m/s) / 2 s = 5 m/s²

• D. Acceleration = 2 s / (10 m/s - 0 m/s) = 0.2 s²/m

Two sisters, Sandy and Lisa, need to move a heavy box full of books across the floor to the other side of their room. Sandy pushes the box to slide it halfway across the floor and then Lisa pulls the box to slide it the rest of the way. Which of the sisters was using a force to move the box? Circle the best answer.

• Both. Force can be a push or a pull.

• Sandy, because force can only be a push and not a pull.

• Lisa, because force can only be a pull and not a push.

• Neither, because they didn’t lift the box.

Tags

NGSS.3-PS2-1

How much force is a truck using to pull a trailer if the trailer has an acceleration of 1.25 m/s² and a mass of 900.0 kg? Circle the best answer.

• Truck force = 1.25 m/s² / 900.0 kg = 0.00139 N

• Truck force = 900.0 kg × 1.25 m/s² = 720 N

• Truck force = 900.0 kg × -1.25 m/s² = 898.8 N

• Truck force = 900.0 kg × 1.25 m/s² = 1,130 N

Tags

NGSS.MS-PS2-2

Jason uses a force sensor to measure the force on a small, hard plastic ball as it hits the ground after being dropped from a height of 1 m and discovers that the ball experiences a maximum force of 10 N. Jason decides to repeat the procedure, but this time he puts a soft cushion on the floor where the ball will land. What do you think Jason will observe in this trial? Circle your prediction.

• The maximum force will be greater.

• The ball will not experience any force.

• The maximum force will be less.

• The maximum force will be the same.

Tags

NGSS.MS-PS2-2

Explain your thinking. Is there a "rule" you used to determine your answer?

Tags

NGSS.MS-LS1-3

NGSS.MS-LS2-4

In the space provided, define air drag and explain where it exists in everyday life.