Mass and weight Knowledge-Based Download PDF

Questions

1. 1.

   If the mass of an object is tripled at a specific location on Earth, how does its weight change?

   • A) It decreases to one-third of its original value.
   • B) It remains equal to its original value.
   • C) It increases to three times its original value.
   • D) It increases to nine times its original value.
2. 2.

   A robotic rover collects a rock sample that weighs 54 N on a planet where the gravitational field strength is 3.6 N/kg. What is the weight of this same sample on a moon where the gravitational field strength is 1.6 N/kg?

   • A) 15 N
   • B) 18 N
   • C) 24 N
   • D) 86 N
3. 3.

   An object has a weight of 180 N at a location where the gravitational field strength is 6.0 N/kg. What net horizontal force is required to accelerate the object across a frictionless surface at 4.0 m/s²?

   • A) 30 N
   • B) 45 N
   • C) 120 N
   • D) 720 N
4. 4.

   Two solid spheres of different masses are released from rest in a vacuum near Earth's surface. Why do both spheres experience the same acceleration toward the ground, even though the heavier sphere has a greater weight?

   • A) The downward gravitational pull on any falling body in a vacuum is identical regardless of mass.
   • B) The larger gravitational force acting on the heavier sphere is precisely offset by its proportionally greater inertia.
   • C) Earth's gravitational field strength increases for lighter objects to maintain equal acceleration.
   • D) The mass of each sphere decreases during free fall until both reach the same effective weight.
5. 5.

   Which of the following situations describes an object whose weight changes while its mass remains constant?

   • A) An ice block melting into liquid water inside a sealed container on a laboratory table
   • B) A satellite traveling from the surface of Earth into a high orbit around Earth
   • C) A wooden block being cut in half during a carpentry project
   • D) A sealed tank of air being heated, causing its internal pressure to rise
6. 6.

   Which statement correctly distinguishes between the mass and the weight of an object?

   • A) Mass is a vector quantity that depends on the local gravitational field, whereas weight is an invariant scalar quantity.
   • B) Mass is measured in newtons using a spring scale, whereas weight is measured in kilograms using a pan balance.
   • C) Mass becomes zero when an object enters free fall, whereas weight remains strictly constant regardless of motion.
   • D) Mass is an intrinsic scalar property representing resistance to acceleration, whereas weight is the downward gravitational force acting on the object.
7. 7.

   A rock sample is measured on Earth using an equal-arm beam balance and a calibrated spring scale. How do the readings change if both measurements are repeated on a planet where the gravitational field strength is three times that of Earth?

   • A) Both the measured mass and the measured weight triple.
   • B) The measured mass remains the same, while the measured weight triples.
   • C) The measured mass triples, while the measured weight remains the same.
   • D) Both the measured mass and the measured weight remain the same.
8. 8.

   An astronaut has a mass of 75 kg on Earth. What are the astronaut's mass and weight on the surface of the Moon, where the gravitational field strength is $1.6\text{ N/kg}$?

   • A) Mass is 12.5 kg, and weight is 120 N.
   • B) Mass is 75 kg, and weight is 120 N.
   • C) Mass is 75 kg, and weight is 735 N.
   • D) Mass is 12.5 kg, and weight is 735 N.