When a lift accelerates upwards, the apparent weight of a person inside increases. This is due to the upward acceleration contributing to the normal force required to provide the net upward force.
One feels heavier in a lift when the lift— [A] is going down steadily [B] just begins to go up [C] is moving up steadily [D] descends freely
Asked in POST GRADUATE TEACHER (PGT) 2018 · Topic: Mechanics (Newton's Laws of Motion and their applications)
More Physics questions
- The centre of gravity of a system of rigid bodies coincides with their centre of mass if and only if
- A person stands at the middle point of a wooden ladder which starts slipping between a vertical wall and the floor of a room, while continuing to remain in a vertical plane. The path traced by a person standing at the middle point of the slipping ladder is:
- Find the torque of a force $\vec{F} = 7\hat{i} + 3\hat{j} - 5\hat{k}$ about the origin. The force acts on a particle whose position vector is $\vec{r} = \hat{i} - \hat{j} + \hat{k}$.
- A planar, irregular shaped object has a mass of 2 kg. Its moment of inertia along the two orthogonal axes in the plane of the object are 3 kg m² and 4 kg m², respectively. The moment of inertia of the object along an axis perpendicular to the plane and passing through a point 0·5 m away from its centre of mass is represented by I. Which one among the following is the correct value of I ?
- Inhabitants are unaware of the speed of rotation of the planet Earth because the angular velocity is constant for each place on the Earth's surface the atmosphere rotates with the Earth there are no nearby objects, either stationary or moving at a rate different from that of the Earth Which of the above is/are the correct explanation(s)?
- A thin disc and a thin ring, both have mass M and radius R. Both rotate about axes through their center of mass and are perpendicular to their surfaces at the same angular velocity. Which of the following is true ?
- A solid disc and a solid sphere have the same mass and same radius. Which one has the higher moment of inertia about its centre of mass ?
- Two racing cars of masses m₁ and m₂ are moving in circles of radii r₁ and r₂ respectively. Their speeds are such that each car makes a complete circle in the same time 't'. The ratio of angular speed of the first to that of the second car is :