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CBSE Class 7 Answered

Explain the following concept  in your own word with everyday example . Force ,work,displacement ,velocity, acceleration,distance 

Asked by sujayavi2 | 09 Oct, 2018, 10:08: AM
Expert Answer
Force : It is push or pull which changes the state of an object.
For example, if the ball is rolling on the ground and if the external force is not applied to it then the ball will come to rest due to force of friction.
 
Work: Work is defined as a force which causes the displacement of an object.
For example, if an object is acted upon by the force of 20 N and if is displaced by disatnce of 8 cm then the woork done is 160 J to move the object from the rest.
 
Displacement: The shortest distance travelled by an object from its initial position to final position is called displacement.
For example, if a particle is moving in circular path of radius 20 cm from its initial point A and after sometime reach point A again then the displacement of the particle will be zero as its final and initial point are same. 
 
Acceleration: The rate of chnage of velocity with respect to time is called acceleration.
For example, if a driver decreases the speed of car from 25m/s to 10 m/s in 5 seconds then the accelartion of the car is 
a= (v-u)/t = (10-25)/5 =-15/5= - 3 m/s2 
Negative sign indicates that the car is deccelerating. 
 
Distance: Distance travelled is actual length of path covered by a body or an object.
For exampe, if  a particle is moving along the cirumference of circular path of radius 20 cm from its initial point A and after sometime reach point A again then the distance covered by the body the particles is 2∏r =2 x 3.14 x 20 = 125.6 cm. 
Answered by Shiwani Sawant | 09 Oct, 2018, 11:20: AM
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