PSSA Forces

A student applies identical forces to a block placed on three different surfaces. The student compares the acceleration of the block for each surface. Which inference about surface 1 is best supported by the results?

• It has the steepest downward tilt.

• It helps the block accelerate the greatest.

• It increases the effect of the force of gravity.

• It produces the greatest friction with the block.

Tags

NGSS.MS-PS2-2

The person using the track with the rollers uses less energy to load the box because the rollers reduce the

• mass of the box

• distance traveled by the box

• force of gravity

• force of friction

Tags

NGSS.MS-ETS1-1

NGSS.MS-PS3-5

The wheels and gears of a machine are greased in order to decrease

• potential energy

• efficiency

• output

• friction

If the unequal opposing forces are applied to the cart at the same time, what will occur?

• The cart will move to the left

• The cart will move to the right.

• The cart will alternate between moving left and right.

• The cart will remain stationary.

Tags

NGSS.MS-PS2-2

The diagrams below show a person moving a 50-kilogram object up a ramp. In which diagram is there the least amount of friction on the object?

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• 
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Tags

NGSS.MS-ETS1-2

NGSS.MS-PS2-2