CLMS Physical Science Unit 3: Forces and Motion

A bus traveled 280 kilometers between two cities. It left the first city at 3pm and arrived at the second city at 7pm. What was the average speed of the bus during the trip?

• 4 km/h

• 40 km/h

• 70 km/h

• 280 km/h

The graph shows a runner's distance from the starting line during a 30 minute race. Distance was measured in meters (m) and time in minutes (min).

During which time interval was the object moving with the greatest average speed?

• 0 - 5 minutes

• 10 - 15 minutes

• 15 - 20 minutes

• 25 - 30 minutes

Tags

NGSS.MS-PS3-1

Clarence told his friends that he kept his car at a constant velocity while racing it along the track. Which best explains why Clarence's statement about keeping his car at a constant velocity is WRONG?

• The speed of the car stayed the same

• The car encountered air resistance

• The direction of the car changed

• The car track gave off heat

Four cars A, B, C and D are moving on a leveled road. Their distance versus time graphs are shown in the figure. Choose the correct statement.

• Car B is faster than car D

• Car B is the fastest

• Car D is slower than Car A

• Car C is the fastest

Tags

NGSS.MS-PS3-1

A researcher observes a car speeding up from rest. The researcher records data about the car and the car's motion.

Which data points can be used to calculate the net force that was acting on the car when it was speeding up? Select TWO correct answers.

• The car's mass is 1,000 kg

• The car's speed increased for 7 seconds

• The car started from rest

• The car's acceleration was 4 m/s²

• The car traveled a total of 300 m

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-1

Two forces act on a block as shown in the diagram. What is the net force on the block?

• 0 N

• 10 N, to the left

• 10 N, to the right

• 30 N, to the left

• 30 N, to the right

Tags

NGSS.MS-PS2-2

Two forces act on the block as shown in the diagram. Identify the acceleration of the block.

• The block does not accelerate

• The block accelerates to the left

• The block accelerates to the right

Tags

NGSS.MS-PS2-2

A student applied a force of 200 N over 10 s to push a box 15 m down the sidewalk. How much work was done on the box?

• 13.3 J

• 300 J

• 3,000 J

• 30,000 J

Which of these statements best describes what will happen if the forces are applied at exactly the same time?

• The refrigerator will move left because of the greatest force on the right

• The refrigerator will move right because the force is over a greater surface area

• The refrigerator will remain in place because the forces are not enough to move it

• The refrigerator will remain in the same place because the net force is zero

Tags

NGSS.MS-PS2-2

To complete a project, 200,000 Joules of work are needed. The time taken to complete the project is 20 seconds. How much power is needed?

• 0.0001 J/s

• 10,000 J/s

• 200,020 J/s

• 1,000,000 J/s