4.1.2.P11

A. A mover is pushing two 60 kg crates along a frictionless horizontal surface as shown in the figure below.

Consider the following four forces:

• F₁: the force that the mover exerts on crate A
• F₂: the force that crate B exerts on crate A
• F₃: the force that crate A exerts on crate B
• F₄: the force that crate A exerts on the mover

Which of the following correctly compares the magnitudes of the horizontal components of these forces?

1. F₁ = F₂ = F₃ = F₄
2. F₁ = F₂ = F₃ > F₄
3. F₁ = F₄ > F₂ = F₃
4. F₂ = F₃ > F₁ = F₄
5. F₁ > F₂ > F₃ > F₄
6. None of these

B. A mover is pushing a 60 kg and a 30 kg crate along a frictionless horizontal surface as configured in the figure below.

Consider the magnitude of the horizontal components of the following four forces:

• F₁: the force that the mover exerts on crate A
• F₂: the force that crate B exerts on crate A
• F₃: the force that crate A exerts on crate B
• F₄: the force that crate A exerts on the mover

Which of the following correctly compares the magnitudes of the horizontal components of these forces?

1. F₁ = F₂ = F₃ = F₄
2. F₁ = F₂ = F₃ > F₄
3. F₁ = F₄ > F₂ = F₃
4. F₂ = F₃ > F₁ = F₄
5. F₁ > F₂ > F₃ > F₄
6. None of these

C. A mover is pushing a 60 kg and a 30 kg crate along a frictionless horizontal surface as configured in the figure below. The boxes move together

Consider the magnitudes of the horizontal components of the following four forces:

• F₁: the force that the mover exerts on crate A
• F₂: the force that crate B exerts on crate A
• F₃: the force that crate A exerts on crate B
• F₄: the force that crate A exerts on the mover

Which of the following correctly compares the magnitudes of the horizontal components of these forces?

1. F₁ = F₂ = F₃ = F₄
2. F₁ = F₂ = F₃ > F₄
3. F₁ = F₄ > F₂ = F₃
4. F₂ = F₃ > F₁ = F₄
5. F₁ > F₂ > F₃ > F₄
6. None of these