Lab: Motion

Question 8 • AA-F26 Physical Science

The table represents the forces on four objects, with directions.ObjectF1 ↑F2 →F3 ←F4 ↓W30 N20 N20 N30 NX15 N35 N25 N15 NY60 N0 N0 N60 NZ45 N0 N22 N45 N

Answer

Objects W and X have balanced forces, and objects Y and Z have unbalanced forces.

Objects W and Y have balanced forces, and objects X and Z have unbalanced forces.

Objects X and Y have balanced forces, and objects W and Z have unbalanced forces.

Objects X and Z have balanced forces, and objects W and Y have unbalanced forces.

Explanation

Forces are balanced when the total force in each direction cancels. Object W has 30 N upward and 30 N downward, and 20 N rightward and 20 N leftward, so its forces balance; object Y’s 60 N upward and downward forces also cancel. Object X has a net 10 N force to the right (35 N right minus 25 N left), while object Z has a net 22 N force to the left, so both are unbalanced. Therefore, choice B is correct.

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