Engineering Physics I Practice Test 2

1. A spherical ball of mass 20kg is stationary at the top of a hill of height 100m. It rolls down a smooth surface to the ground, then climbs up another hill of height 30m and finally rolls done to a horizontal base at a height of 20m above the ground. The velocity attained by the ball is ___________

2. A satellite orbiting the earth with speed v₀. To make the satellite escape, what should be the minimum percentage increase in its velocity?

3. When a body is lifted, the work done by the gravitational force is positive.

4. When a spring is compressed or stretched, the potential energy of the spring ___________

5. For a body in equilibrium, the linear acceleration of its centre of mass would be zero and also the angular acceleration of the rigid body about any axis would be zero.

6. On being displaced, the centre of mass of unstable equilibrium goes ___________

7. Which of the following is an example for a force which does work on a body but fails to change its kinetic energy?

8. In an inelastic collision, the final kinetic energy is always less than the initial kinetic energy of the system.

9. The Sun’s attraction of both earth and moon are external forces acting on the centre of mass of the earth-moon system.

10. A hammer is resting on a plane surface. If force P is applied on the hammer along with a line not passing through its centre of mass, them the hammer _____________