The Idea of Average Force

Q.

How is work related to applied force?

Q.

Read the given statement carefully and answer whether work is done or not done, and why?

A standing man holding a suitcase in his hand.

Q.

Is it possible that a force acting on a body but still the work done is zero .Explain giving one example.

Q. If the Force is zero will the work done be also zero? OR If the s(displacement) is zero will the work done be zero? In which case the Work done will always be zero?

Q.

A hypothetical spring type object, exerts a force dependent on diplacement x, given by $4x^3$. What is the average force exterted by it while being displaced 2 units from its natural position?

1. 2

2. 4

3. 8

4. 16

Q.

A freight car is moving on smooth horizontal track without any external force. Rain is falling at the rate of u m/s at an angle $\theta$ with the vertical. Rain drops are collected in the car at the rate of $\mu$ kg/s. If initial mass of the car is $m_0$ and velocity $v_0$ then find its velocity after time it.

1. $v=2ucos\theta (\frac{m_0}{m_0+\mu t}-1)+\frac{m_0{v}_0}{(m_0+\mu t)}$

2. $v=usin\theta (\frac{m_0}{m_0+\mu t}-1)+\frac{3m_0{v}_0}{(m_0+\mu t)}$

3. $v=usin\theta (\frac{m_0}{m_0+\mu t}-1)+\frac{m_0{v}_0}{(m_0+\mu t)}$

4. $Zero$

Q.

A freight car is moving on smooth horizontal track without any external force. Rain is falling at the rate of u m/s at an angle $\theta$ with the vertical. Rain drops are collected in the car at the rate of $\mu$ kg/s. If initial mass of the car is $m_0$ and velocity $v_0$ then find its velocity after time it.

1. $v=2ucos\theta (\frac{m_0}{m_0+\mu t}-1)+\frac{m_0{v}_0}{(m_0+\mu t)}$

2. $v=usin\theta (\frac{m_0}{m_0+\mu t}-1)+\frac{3m_0{v}_0}{(m_0+\mu t)}$

3. $v=usin\theta (\frac{m_0}{m_0+\mu t}-1)+\frac{m_0{v}_0}{(m_0+\mu t)}$

4. $Zero$

Q.

If you performed a work "W" on an object and no external forces are acting on you and the object, while doing this work, which of the following can be true:

1. Work done by the object on you is "-W"

2. Work done on you is "-W"

3. Work done by the object is "-W"

4. Work done by you is "W"

Q.

If you performed a work "W" on an object and no external forces are acting on you and the object, while doing this work, which of the following can be true:

1. Work done by the object on you is "-W"

2. Work done on you is "-W"

3. Work done by the object is "-W"

4. Work done by you is "W"