Question

You alone can push a roller. But when your friend joins you, the roller moves faster. This is because:

• A. forces in same direction add up.
• B. forces in same direction do not add up.
• C. forces in same direction get subtracted.
• D. forces in same direction remain same.

Answer 1

The correct option is A forces in same direction add up.

When your friend joins you, both of you push the roller in same direction. So, your forces, being applied in same direction, add up to a larger value. Thus the roller moves faster.