Tag: introduction to force

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Multiple choice physics force and types of force introduction to force what is force? concept of force and its unit

A stone is suspended by a thread from a rigid support, another thread of same quality is attached at the bottom of done if the lower thread is pulled suddenly then

  1. Upper thread break first

  2. Lower thread break first

  3. Both will break at same time

  4. None of these two threads will break
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

When the lower thread is pulled suddenly, the inertia of the stone prevents it from moving immediately. The force is applied directly to the lower thread, causing it to break before the tension can be transmitted to the upper thread.

Multiple choice physics force and types of force introduction to force what is force? concept of force and its unit

Fill in the blanks .
At least _____________ object must interact for a force to come into play. 

  1. 1

  2. 2

  3. 3

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

Forces are used in our daily life actions like pushing, pulling, lifting, twisting etc. So, a force is a pull or push acting on an object which tends to change the state of rest/ motion of an object. An interaction of one object with another object results in a force between the two objects.

For example, Weightlifter uses muscular force to lift the weights.

Hence, At least 2 object must interact for a force to come into play. 

Multiple choice physics force and types of force introduction to force what is force? concept of force and its unit

Which one of the following statements regarding Newton's first law of motion is incorrect?

  1. It is an independent statement

  2. it defines an inertial frame of reference

  3. It was first enunciated by Galileo

  4. It is a special case of Newton's second law.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Newton's first law is not an independent statement because it is a special case of the second law (where F=0, a=0). It defines inertial frames, but it is derived from the broader scope of the second law.

Multiple choice physics force and types of force introduction to force what is force? concept of force and its unit

Which statement defines force?

  1. When a force acts on a body that is free to move, the force is the product of the mass of the body and its acceleration

  2. When a force acts on a body that is free to move, the force is the rate of change of momentum of the body

  3. When a force acts on a body that is free to move, the force is the work done by the force divided by the distance moved by the body

  4. When a force acts on a lever and causes a moment, the force is the moment divided by the perpendicular distance of the force from the pivot
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

we know that 

$F= ma $ ..........(1)
and $a = \dfrac{dv}{dt}$
So from above eqn . 
$\implies F = \dfrac{mdv}{dt}$
$\implies F = \dfrac{dmv}{dt}$
$\implies F = \dfrac{dp}{dt}$
So, force = rate of change of momentum

Multiple choice physics force and types of force introduction to force what is force? concept of force and its unit

A force cannot be seen but the effect of force can be felt.

  1. True

  2. False

  3. Ambiguous

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

According to Newton's first law, force is the rate of change of momentum.
Therefore, a force is not a physical object that can be seen. However, the effect of a force on an object can be seen (i.e its changing momentum)

Multiple choice physics force and types of force introduction to force what is force? concept of force and its unit

Which of the following class of forces is different from others?

  1. Pulling of a cart

  2. Stretching of a coiled spring

  3. Kicking of a football

  4. Weight of the body
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Pulling of a cart, stretching of a coiled spring and kicking of a ball take place due to contact forces but weight of the body (gravitational force) is a non-contact force.

Hence option D is correct.