TBA 4 Review

A book rests on a table. The force of gravity pulls down on the book with a force of 20 newtons. What prevents the books from moving downward?

• The table presses back up on the book with a force greater than 20 newtons.

• The inertia of the book holds it up

• The table presses back up on the book with an equal and opposite force of 20 newtons.

• The table and the book together are accelerating downwards at 9.8 m/sec²

Tags

NGSS.MS-PS2-1

At what position does the rock have the greatest kinetic energy?

• A

• c

• D

• E

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

Show all your work on your answer document. (Average speed = total distance / total time)

Remember to look at your X and Y axis to ensure that you have the units of measurement correct.

• 5 m/s

• 5 km/min

• 0.2 km/min

• 0.2 m/s

Tags

NGSS.MS-PS3-1

The diagram shows an investigation in a science classroom. Students pull the same mass up an inclined plane propped up on five blocks, then six, seven, and eight blocks. Each time they use a spring scale to measure the force needed to pull the mass up the inclined plane. This investigation can show how which of the following affects the force needed to move an object up an inclined plane?

• The mass of the object.

• The height of the inclined plane.

• The length of the inclined plane.

• The surface area of the object.

Tags

NGSS.MS-PS2-2

Explain what happens to the potential energy of a rock as it falls off the side of a cliff.

• The kinetic energy decreases as the potential energy increases.

• 
  The kinetic energy decreases as the potential energy decreases.

• The potential energy decreases as the kinetic energy increases.

• The potential energy decreases as the kinetic energy decreases. 

Tags

NGSS.MS-PS3-2

NGSS.MS-PS3-5

A runner's times for each section of a 400-meter race are shown below:

Results from 400-meter Race

Section Time

1st 100 m 11 seconds

2nd 100 m 13 seconds

3rd 100 m 14 seconds

4th 100 m 14.5 seconds

Which is the average speed of the runner?

• 400 m/s

• 7.6 m/s

• 52.5 m/s

• 6.9 m/s

Tags

NGSS.MS-PS3-1

Students are investigating changes from potential to kinetic energy by rolling a marble down a ramp made by propping up a plastic ruler on a book and letting it roll down.

Which of the following will change the potential energy the marble starts with?

• Adding more books beneath the ruler to increase its height

• Pushing the marble down the ramp

• Switching the plastic ruler with a wooden one

• Replacing the marble with a rock

Tags

NGSS.MS-PS3-2

What is happening in section C?

• going down a hill

• 
  speed is increasing

• returning to start

• 
  speed is decreasing

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-4

Students pulled the same mass up an inclined plane that was 20 cm, 30 cm, and 40 cm long. Each time, they used a spring scale to measure the force needed to pull the mass up the inclined plane. What did they conclude?

• Less force was needed on the 20 cm plane

• More force was needed on the 40 cm inclined plane.

• The least amount of force was needed on the 40 cm inclined plane.

• The least amount of force was needed on the 30 cm inclined plane.

Tags

NGSS.MS-PS2-2

This is a rocket. The rocket pushes the fuel down. What is the other force in this interaction pair?

• The fuel pulls the rocket up.

• The fuel pushes the rocket up.

• 
  The rocket pulls the earth up.

• The earth pulls the rocket down.

Tags

NGSS.MS-PS2-1