A person just supports a mass of 20 kg suspended from a rope.What is the resultant force acting on the mass?
Correct answer: A. 0N
- A. 0N
- B. 10N
- C. 20N
- D. 200N
Explanation
The correct answer is 0 N. According to Newton's first law of motion, an object at rest remains at rest unless acted upon by a net external force. In this scenario, the gravitational force pulling the mass downward (200 N) is perfectly balanced by the tension in the rope pulling upward (also 200 N). Therefore, the resultant force is 0 N. Other options either mistakenly represent individual forces acting on the mass rather than the net force, or are incorrect assumptions of unbalanced forces.
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Displacement, velocity and acceleration describe motion, including the horizontal and vertical components of projectile motion. The chapter connects these quantities with Newton's laws, momentum and impulse, then applies conservation of momentum to collisions, distinguishing elastic collisions from inelastic ones.
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