Tag: physics

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Questions Related to physics

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

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

  1. Only (i) and (ii)

  2. Only (ii) and (iii)

  3. Only (i) and (iii)

  4. (i), (ii) and (iii)
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

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

The inertia of an object tends to cause the object:

  1. $to\ increase\ its\ speed$
  2. $to\ decrease\ its\ speed$
  3. $to\ resist\ any\ change\ in\ its\ state\ of\ motion$
  4. $to\ decelerate\ due\ to\ friction$
Reveal answer Fill a bubble to check yourself
C Correct answer
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

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

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

  1. forwards

  2. backwards

  3. to his right

  4. to the horse's right
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

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.

  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
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

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

  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. $t = \dfrac {m}{b} \times \dfrac {1}{2} ln2$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

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

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

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

  1. Forced vibrations

  2. Free vibration

  3. Damped vibrations

  4. All
Reveal answer Fill a bubble to check yourself
B Correct answer
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. 

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

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

  1. forced vibration.

  2. damped vibration

  3. loudness

  4. pitch
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

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