Newton's Second Law - AP Physics 1: Unit 2 Review Supplement

As a rock falls toward Earth, the force the rock exerts on the Earth is:

• Equal in magnitude and upward

• Zero

If an object accelerates only in the y-direction, what must be true about forces in the y-direction?

• There is a nonzero net force in the y-direction

• Forces cancel in the y-direction

If an object has zero acceleration in the x-direction, what must be true?

• Net force in the x-direction is zero

• There are no forces in the x-direction

If a force has components 40 N (x) and 30 N (y), its magnitude is:

• 50 N

• 70 N

An object has constant velocity in y and acceleration in x. What must be true?

• Net force is zero in y and nonzero in x

• Net force is nonzero in y and zero in x