Rush - Force and Energy

1. A student is investigating acceleration using balls with different masses. The student pushes each ball on a flat surface and records its acceleration. The table shows his observations.

Ball Mass (kg) Force (N) Acceleration (m/s^2)

1 30 100 7.35

2 40 100 5.5

3 45 100 4.9

4 50 100 4.41

Which claim can the student make using his observations?

• a. A ball with a mass of 15 kg will have an acceleration that is less than 3.3 ft/s² when pushed with a force of 100 N.

• a. A ball with a mass of 60 kg will have an acceleration that is greater than 4.49 m/s² when pushed with a force of 100 N.

• a. A ball with a mass of 35 kg will have an acceleration that is nore than 7.35 m/s² when pushed with a force of 100 N.

• A ball with a mass of 20 kg will have an acceleration that is greater than 5.5 m/s² when pushed with a force of 100 N

Tags

NGSS.MS-PS2-2

The graph shows the amount of force needed to accelerate a baseball and a softball at the same rate. Point P shows the data for the baseball, and Point Q shows the data for the softball. How does the graph provide evidence that the force needed to accelerate the objects is proportional to their mass?

• The x-value of Q is greater than the x-value of P.

• A curved line can be drawn between P, Q, and the point (0,0).

• A straight line can be drawn between P, Q, and the point (0,0).

• The y-value of Q is greater than the y-value of P.

Tags

NGSS.MS-PS2-2

A student moves 4 boxes along a friction-less surface. The student claims that the force required to move each box the same distance is proportional to the mass of each box. Which argument BEST supports the student's claim?

• The box with the highest mass requires the most force to move the same distance.

• The box with the highest acceleration requires the most force to move the same distance.

• The box with the lowest acceleration requires the most force to move the same distance.

• The box with the lowest mass requires the most force to move the same distance.

Tags

NGSS.MS-PS2-2

A student is investigating inertia and acceleration. Assuming the force acting on the objects is constant, which claim about inertia and acceleration is supported by the data?

Force (N) Mass (kg) Acceleration (m/)

3 15 5

4 15 3.75

3 30 10

4 30 7.5

• An object with a lower mass has less inertia, which causes it to speed up less quickly.

• An object with a higher mass has more inertia, which causes it to speed up less quickly

• An object with a higher mass has less inertia, which causes it to speed up more quickly.

• An object with a lower mass has more inertia, which causes it to speed up more quickly.

Tags

NGSS.MS-PS2-2

When Jonah flies his paper airplane, it flies through the air for a few feet and then begins to fall. What would explain the plane's ability to travel forward for a few feet without falling?

• The speed of the plane is equal to the speed of the oncoming air that pushes on the plane

• The force of the air pushing up on the plane is equal to the force of gravity pulling down on the plane

• The force of gravity pulling down on the plane is greater than the force of the air pushing up on the plane

• The speed of the plane is greater than the speed of the oncoming air that pushes on the plane.

Tags

NGSS.MS-PS2-2

A water rocket uses an amount of water and pressurized air to send a plastic rocket several feet into the air. As the water and air rush out the tail end of the rocket, the rocket shoots into the air. Explain the motion of the rocket.

• The inertia of the water and air must be overcome.

• The force of gravity of the rocket is greater than the water.

• The force of gravity must be overcome to achieve lift.

• For every action there is an equal and opposite reaction.

A car travels 60 miles north in the first 60 minutes of a trip. The same car travels 30 miles west in the next 30 minutes of the trip. What can be said about the motion of the car?

• The car is traveling at constant speed.

• The car is accelerating at a constant rate.

• The car is decreasing its speed.

• The car is moving at a constant velocity.

Which change in force would stop the box from moving?

• Adding 6 N of force pulling to the left.

• Adding 6 N of force pulling to the right.

• Subtracting 8 N of force pulling to the left.

• Subtracting 8 N of force pulling to the right.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Which statement best describes the motion of the box when the forces pull on the box?

• The box will move to the left because the forces are balanced.

• The box will move to the right because the forces are balanced.

• The box will move to the left because the forces are unbalanced.

• The box will move to the right because the forces are unbalanced.

Tags

NGSS.MS-PS2-2

Lauren tries to push a bookshelf across the room. As much as she tries, she cannot get the bookshelf to move. Why?

• Lauren did not apply enough force to the bookshelf and so the forces are unbalanced.

• Lauren did not apply enough force to the bookshelf and so the forces are still balanced.

• Lauren applied too much force to the bookshelf and now the forces on the bookshelf are balanced.

• Lauren applied too much force to the bookshelf and now the forces on the bookshelf are unbalanced.

Tags

NGSS.MS-PS2-2