Lesson 1 - Laws of Motion

1. 1. Inertia of a body depends on:
   
   
   
   
   

• (a) weight of the object

• (b) acceleration due to gravity of the planet

• (c) mass of the object

• (d) both (a) & (b)

Impulse is equals to ______ .

• (a) rate of change of momentum

• (b) rate of force and time

• (c) change of momentum

• (d) rate of change of mass.

Newton’s III law is applicable:

• (a) for a body is at rest

• (b) for a body in motion

• (c) both (a) & (b)

• (d) only for bodies with equal masses

Plotting a graph for momentum on the X-axis and time on Y-axis. Slope of momentum – time graph gives _____

• (a) Impulsive force

• (b) Acceleration

• (c) Force

• (d) Rate of force.

In which of the following sport the turning effect of force is used?

• (a) swimming

• (b) tennis

• (c) cycling

• (d) hockey

One kilogram force equals to _____ .

• (a) 9.8 dyne

• (b) 9.8 × 10⁴ N

• (c) 98 × 10⁴ dyne

• (d) 980 dyne.

The mass of a body is measured on planet Earth as M kg. When it is taken to a planet of radius half that of the Earth then its value will be ….. kg.

• (a) 4 M

• (b) 2 M

• (c) M/4

• (d) M

To project the rockets which of the following principle(s) is / (are) required?

• (a) Newton’s third law of motion

• (b) Newton’s law of gravitation

• (c) law of conservation of linear momentum

• (d) both a and c.

Which of the following is a vector quantity?

• (a) speed

• (b) distance

• (c) momentum

• (d) time

Unit of momentum in SI system is ______ .

• (a) ms^-1

• (b) Kg ms^-2

• (c) Kg ms^-1

• (d) ms^-2