Physics Practice: Laws of Motion (Mock Test 4 - Expert Logic)
1. Expert Analysis: If the force acting on a body is tripled and its mass is doubled, the acceleration will be ________ times the original acceleration.
2. A block of mass $M$ is pulled along a horizontal frictionless surface by a rope of mass $m$. If a force $F$ is applied at one end of the rope, the force which the rope exerts on the block is:
3. Inertia of a body is a quantitative measure of its ________.
4. Why does a pilot fly at a higher altitude to achieve higher speed with the same thrust?
5. A machine gun fires $20\text{ g}$ bullets at a rate of $10$ per second with a speed of $500\text{ m/s}$. The force required to hold the gun is:
6. If a body is moving with uniform velocity, we can conclude that:
7. Newton's second law of motion is a ________ law.
8. When a bus takes a sharp turn, passengers are thrown outwards due to ________.
9. $1\text{ Newton}$ is defined as the force which gives a mass of $1\text{ kg}$ an acceleration of ________.
10. The gravitational force of attraction between two masses $m_1$ and $m_2$ separated by distance $r$ is given by:
11. A body of mass $m$ is moving on a circular path of radius $r$ with constant speed $v$. The work done by the centripetal force is:
12. The force of friction ________ with the increase in the roughness of the surfaces in contact.
13. Newton's laws of motion are valid only in ________ frames of reference.
14. While walking on ice, one should take small steps because ________.
15. The "Rate of change of momentum" is another way to define ________.
16. When a horse pulls a cart, the force that helps the horse to move forward is the force exerted by ________.
17. Impulse has the same dimension as ________.
18. If a body moves with a constant speed in a straight line, then ________.
19. Lubrication between two surfaces ________ the friction.
20. The weight of an object at the centre of the Earth is ________.