# Physics-Objective Related Question Answers

### 51. Actual length travelled by a body is called?

Distance

### 52. Shortest distance from the initial to the final position of a body is called?

Displacement.

### 53. The study of particles or bodies when they are at rest or in motion is dealt with?

Mechanics

### 54. Mechanics is divided into two, they are?

Statics & Dynamics

### 55. The study of objects of-rest is called?

Statics

### 56. The study of moving objects is called?

Dynamics

### 57. The product of mass and velocity of a body?

Momentum [P= mv [m=Mass; v=velocity]

### 58. Unit of Momentum is?

kg m/s

### 59. A Karate player in order to break a brick hits quickly because of?

Momentum

### 60. Issac Newton propounded his law of motion is his book?

Principia Mathematica

### 61. Propulsion of rocket is explained by which law of motion?

Newton’s Third law of motion

### 62. Swimming is explained by which law of motion?

Newton’s Third law of motion

### 63. Flying of Birds is explained by which law of motion?

Newton’s Third law of motion

### 64. A property of a body which is unable to change its state by itself in the absense of external force called?

Inertia

### 65. The Law of inertia was discovered by?

Galileo

### 66. Which are the three types of inertia?

Inertia of Rest; Inertia of Motion and Inertia of Direction

### 67. An athlete runs some distance before taking a long jump is example of?

Inertia of motion

### 68. As the train starts moving, a man sitting inside leans backward is an example of?

Inertia of rest

### 69. Rotating wheel of an automobile throw out mud tangentially outward is an example of?

Inertia of direction

### 70. If a rotating body spins on its axis, its motion is called?

Spin motion or rotation motion

### 71. When an object travels around another object it is known as?

Revolution

### 72. The motion of an object in a vertical plane under the influence of gravitational force is known as?

Projectile motion

### 73. Projectile path is known as?

Trajectory

### 74. A projectile reaches maximum range, when angle of projection is at?

450

### 75. The path of the projectile is always a?

Parabola

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