Multiple choice

Which of the following would require the least amount of input force?

  1. lifting a couch from the ground into a truck

  2. carrying a chair upstairs to a house

  3. wheeling a dresser up a ramp into a house

  4. lifting a box from the floor onto a shelf.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Using a ramp (an inclined plane) allows you to move an object to a higher elevation using less force than lifting it vertically, because the distance is increased.

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