Let’s go through each row one by one. Remember:
Work is done on an object only if the force you apply and the motion of the object are in the same direction (or at least have some part in the same direction). If they’re perpendicular — like force up but motion sideways — then NO work is done.
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Row 1:
Person pushing a box → Force is to the right. But motion says “NONE” — meaning the box isn’t moving.
→ If there’s no motion, even if you push,
no work is done.
✔ Answer:
NO
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Row 2:
Person pushing a crate → Force is to the right. Motion is also to the right.
→ Force and motion are in the SAME direction →
Work IS being done.
✔ Answer:
YES
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Row 3:
Person carrying a backpack while walking forward → Force is UP (to hold the backpack against gravity), but motion is FORWARD (right).
→ Force (up) and motion (right) are PERPENDICULAR →
No work is done on the backpack by the upward force.
✔ Answer:
NO
*(Note: You might think “but I’m tired!” — that’s because your muscles are working internally, but physics says no work is done ON the backpack since it’s not moving up or down.)*
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Row 4:
Person lifting a box straight up → Force is UP, motion is also UP.
→ Same direction →
Work IS being done.
✔ Answer:
YES
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Row 5:
Person holding a box while walking sideways → Force is UP (holding it up), motion is RIGHT (walking).
→ Again, force and motion are perpendicular →
No work is done on the box by the upward force.
✔ Answer:
NO
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Final Answer:
Row 1: NO
Row 2: YES
Row 3: NO
Row 4: YES
Row 5: NO
Parent Tip: Review the logic above to help your child master the concept of worksheet that work.
