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AP Physics 1
2.5 Newton’s Second Law
2.3 Newton’s Third Law
IntermediateMCQConceptual18.6k
A horizontal surface with two blocks in contact. Block 1, a smaller rectangle labeled 'm', is on the left. Block 2, a larger rectangle labeled '3m', is on the right. A horizontal arrow labeled 'Fp' points to the right and is applied to the left side of Block 1.
A person pushing two connected blocks of masses m and 3m across a frictionless surface.
A student applies a constant horizontal force \(F_P\) to Block 1 of mass \(m\). Block 1 is in contact with Block 2 of mass \(3m\), and both blocks accelerate together to the right across a horizontal surface where friction is negligible. Which of the following correctly compares the magnitude of the force Block 1 exerts on Block 2, \(F_{12}\), to the magnitude of the force Block 2 exerts on Block 1, \(F_{21}\)?

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