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### 40 Important General Science Question and Answers 03

01. Actual length travelled by a body is called? - Distance
02. The shortest distance from the initial to the final position of a body is called? - Displacement.
03. The study of particles or bodies when they are at rest or in motion is dealt with? - Mechanics
04. Mechanics is divided into two, they are? - Statics & Dynamics
05. The study of objects of rest is called? - Statics
06. The study of moving objects is called? - Dynamics
07. The product of mass and velocity of a body? - Momentum [P= mv [m=Mass, v=velocity]
08. Unit of Momentum is? - kg m/s
09. A Karate player in order to break a brick hits quickly because of? - Momentum
10. Issac Newton propounded his law of motion in his book? - Principia Mathematica
11. Propulsion of the rocket is explained by which law of motion? - Newton’s Third law of motion
12. Swimming is explained by which law of motion? - Newton’s Third law of motion
13. Flying of Birds is explained by which law of motion? - Newton’s Third law of motion
14. A property of a body which is unable to change its state by itself in the absence of external force called? - Inertia
15. The Law of inertia was discovered by? - Galileo
16. Which are the three types of inertia? - The inertia of Rest, Inertia of Motion and Inertia of Direction
17. An athlete runs some distance before taking a long jump is an example of? - Inertia of motion
18. As the train starts moving, a man sitting inside leans backwards is an example of? - Inertia of rest
19. Rotating wheel of an automobile throw out mud tangentially outward is an example of? - Inertia of direction
20. If a rotating body spins on its axis, its motion is called? - Spin motion or rotation motion
21. When an object travels around another object it is known as? - Revolution
22. The motion of an object in a vertical plane under the influence of gravitational force is known as? - Projectile motion
23. The projectile path is known as? - Trajectory
24. A projectile reaches maximum range when the angle of projection is at? - 45°
25. The path of the projectile is always a? - Parabola
26. An influence that changes the state of rest in a straight line of a body is called?  - Force F= ma [m = mass; a = acceleration]
27. Unit of Force is? - Newton or Kg m/s2
28. CGS unit of Force is -? - Dyne
29. The strongest force in the universe is? - Nuclear force
30. Weakest force in the universe? - Gravitational Force
31. Force acting for a short time? - Impulsive force
32. The force which acts on a body moving in a circular path and it is directed towards the centre is called? - Centripetal force
33. The force required by a Vehicle moving around a curved road is? - Centripetal force
34. Force that acts on a body moving in a circular path and is directed away from the centre is called? - Centrifugal force
35. The force that helps to separate cream from milk is? - Centrifugal force
36. Capability of rotating objects around a fixed axis is called? - Torque
37. Force that resists the movement of one surface over another is called? - Frictional Force
38. The substances which reduce the frictional force between moving surfaces? - Lubricants eg: Grease, Oil, Graphite
39. Force acts in a direction opposite to the direction of motion is? - Static Friction
40. Force occurs when two objects are moving relative to each other or rub together is? - Kinetic Friction 