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Two crates of masses 120 kg and 65 kg are resting on a smooth horizontal surface - NSC Technical Sciences - Question 1 - 2021 - Paper 1
Question 1
Two crates of masses 120 kg and 65 kg are resting on a smooth horizontal surface. When a force of 600 N is applied on the 120 kg crate, the whole system accelerates,... show full transcript
Worked Solution & Example Answer:Two crates of masses 120 kg and 65 kg are resting on a smooth horizontal surface - NSC Technical Sciences - Question 1 - 2021 - Paper 1
Step 1
Which ONE of the following diagrams BEST represents a free-body diagram of ALL the forces acting on the 120 kg crate?
Answer
To determine the correct free-body diagram for the 120 kg crate, we need to consider all forces acting on it. The forces to account for include:
- The applied force of 600 N to the right.
- The normal force acting upward.
- The gravitational force acting downward (weight of the crate).
- The force exerted by the 65 kg crate (F₆₅ₖg) acting to the left due to Newton's third law of motion.
The correct representation must show the rightward force of 600 N, the upward normal force, the downward gravitational force, and the leftward force of F₆₅ₖg.
After analyzing the options, the diagram that properly represents these forces is option D.