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PHY101 Physics Assignment No 01 Fall 2019 Solution & Discussion

PHY101 Physics Assignment No 01 Fall 2019 Solution & Discussion

Question No. 1                                                                                              (Marks=5 x 3=15)

1. Is it true or wrong to say that an object with zero acceleration has velocity? Either yes or no explicate it with example.
2. Can we say that an object with zero velocity have acceleration? Either yes or no explicate it with example.
3. Is it wrong or correct to say that, if an object has constant acceleration, it has a constant velocity? Either yes or no explicate it with example.

Question No. 2                                                                                                        (Marks=10)

Estimate the soccer ball‘s speed immediately after being kicked off if its mass is 0.5Kg as shown in the given figure.

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PHY101 Assignment#01 Correct solution File

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PHY101 Assignment#01 Correct solution File

PHY101-Assignment-01-Correct-Solution-File-vustudents.ning.com

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PHY101_Assignmnet_1_Solution_Fall_2019_vustudents.ning.com

PHY101_Assignmnet_1_Solution_Fall_2019_vustudents.ning.com

PHY101 Solution Assignment#01 Fall 2019

PHY101 assignment#01 solution

*****Solution*****

PHY101 Assignment No.1 Solution Fall 2019

Question No. 1

1. Is it true or wrong to say that an object with zero acceleration has velocity? Either yes or no explicate it with example.

Solution:

The velocity and acceleration of a particle do not depend on each other (however rate of change of velocity with respect to time gives acceleration ) i.e if velocity is zero acceleration  may or may not be zero or vice versa.

Example :

1. Consider a simple example when we start a vehicle, initially we have zero velocity but have non-zero acceleration(that is why vehicle will start moving).
2. If we drop a ball from some height above the earth surface the velocity at that instant is zero but acceleration in non zero (gravity) which acts downward. The acceleration would increase the velocity in some time.
3. Can we say that an object with zero velocity have acceleration? Either yes or no explicate it with example.

Solution:

Yes, an object can have zero velocity and still be accelerating simultaneously.

Example:

Consider an object moving in the forward direction. suddenly a force acts on it and tries to acceleration the object in the backward direction . when you observe the object, you will find that the object will continue to move forward for some time and then stops momentarily. Then the object will start to move in the backward direction.

1. Is it wrong or correct to say that, if an object has constant acceleration, it has a constant velocity? Either yes or no explicate it with example.

Solution

An object with a constant  acceleration should not be confused with an object with a constant velocity.

If an object is changing its velocity whether by a constant amount or a varying amount then it is an acceleration object. And an object with a constant velocity is not accelerating.

Q.2     Estimate the soccer ball‘s speed immediately after being kicked off if its mass is 0.5Kg

Solution :

PHY101 Assignment No.1 Solution Fall 2019

PHY101 Assignment No.1 Solution Fall 2019

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