Tag: physics

Questions Related to physics

On what factors does the inertia of motion depend?

physics force and newton's laws of motion inertia and mass concept of inertia galileo's law and inertia

  1. Mass

  2. Velocity

  3. Acceleration

  4. Displacement

Show answer
Correct Option: A
Explanation:

Inertia of motion depend upon mass

Which of the following safety features are used in vehicles to reduce the negative effects of inertia?

(i)Safety seat belts(ii)Automatic air bags(iii)Absorber bumpers
physics force and newton's laws of motion inertia and mass concept of inertia galileo's law and inertia

  1. Only (i) and (ii)

  2. Only (ii) and (iii)

  3. Only (i) and (iii)

  4. (i), (ii) and (iii)

Show answer
Correct Option: D
Explanation:

$Force=mass*\dfrac{momentum}{time}$

since the effect of inertia depend on force if the time of impact is increased and hence the same force will produce less effect of inertia the safety seat belt,automatic air bag,Absorber bumpers produce the same effect to decrease the negative effect of inertia.

The inertia of an object tends to cause the object:

physics force and newton's laws of motion inertia and mass concept of inertia galileo's law and inertia

  1. $to\ increase\ its\ speed$

  2. $to\ decrease\ its\ speed$

  3. $to\ resist\ any\ change\ in\ its\ state\ of\ motion$

  4. $to\ decelerate\ due\ to\ friction$

Show answer
Correct Option: C
Explanation:

Inertia of an object is the tendency of the object to resist change in  motion. The inertia is directly dependent on the mass of the body. 
Inertia resist any change in its state of motion and is of three types:

  1. Inertia of rest
  2. Inertia of motion
  3. Inertia of direction

When a running horse suddenly stops, the rider falls  _________.

physics force and newton's laws of motion inertia and mass concept of inertia galileo's law and inertia

  1. forwards

  2. backwards

  3. to his right

  4. to the horse's right

Show answer
Correct Option: A
Explanation:

When horse stop suddenly rider falls due to inertia as when the horse is in motion rider also is in motion and when horse stop suddenly there is no external force acting on the ride to stop its motion therefore  rider falls forward.

Inertia means resistance to the change of state.

physics force and newton's laws of motion inertia and mass concept of inertia galileo's law and inertia

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

Yes inertia means resistance to the charge of state

Hence,
option $A$ is correct answer.

Inertia of a body is directly dependent on its: 

physics force and newton's laws of motion inertia and mass concept of inertia galileo's law and inertia

  1. velocity

  2. volume

  3. mass

  4. all of the above

Show answer
Correct Option: C
Explanation:

If we see by Newton second law of motion.

  $F _{net}=ma$
$a=\frac{F}{m}$ 
a is depend on mass and is inversely proportional which state that the heavy object exhibit more inertia and they resist motion.

A coin tossed vertically by a passenger sitting in a train that is moving with a uniform velocity, still returns to his palm. This demonstrates the principle of.

physics force and newton's laws of motion inertia and mass concept of inertia galileo's law and inertia

  1. Inertia(Newton's First Law of Motion)

  2. Conservation of angular momentum

  3. Addition of velocities of the train and the coin

  4. Addition of forces due to gravity and the toss of the coin

Show answer
Correct Option: A
Explanation:

A coin tossed vertically by a passenger sitting in a train that is moving with a uniform velocity, still returns to his palm, it happens due to the phenomenon of inertia as the person and coin in his hand both are in uniform motion with the train.

$mx^{2} - bx + k = 0$. Find time after which to the energy will become half of initial maximum value in damped forced oscillation.

free, damped and forced oscillations free, forced and damped oscillations oscillations oscillation and waves physics

  1. $t = \dfrac {m}{b} + \dfrac {1}{2} ln2$

  2. $t = \dfrac {m}{b} \times \dfrac {2}{3} ln2$

  3. $t = \dfrac {m}{b} - \dfrac {1}{2} ln2$

  4. $t = \dfrac {m}{b} \times \dfrac {1}{2} ln2$

Show answer
Correct Option: D
Explanation:

$\dfrac {1}{\sqrt {2}} = e^{-bt/m}$
$ln \sqrt {2} = \dfrac {bt}{m}$
$t = \dfrac {m}{b} \times \dfrac {1}{2} ln2$.

The periodic vibrations of a body of constant amplitude in the absence of any external force on it are called

free, damped and forced oscillations free, forced and damped oscillations oscillations oscillation and waves physics

  1. Forced vibrations

  2. Free vibration

  3. Damped vibrations

  4. All

Show answer
Correct Option: B
Explanation:

Forced vibrations: External force is acting on the body. 
Free vibration: Constant amplitude and no external force.
Damped vibration: Amplitude is not constant, it keeps on decreasing due to environmental factors of the system like air resistance.  
Therefore, correct option is B. 

The tendency of one object to force another adjoining or interconnected object into vibration motion is referred to as a 

free, damped and forced oscillations free, forced and damped oscillations oscillations oscillation and waves physics

  1. forced vibration.

  2. damped vibration

  3. loudness

  4. pitch

Show answer
Correct Option: A
Explanation:

The tendency of one object to force another adjoining or interconnected object into vibrating motion is referred to as a forced oscillation.