The Physics problems is an excellent online resource for students where students can get solved examples and practice questions on various Physics topics. Students can get help with Physics from the expert tutors online.
Introduction to Physics Problems
Physics as we know,is a branch of science which deals ith the study of nature and natural phenomena.For any precise description of any such phenomenon, measurement of the quantities involved is essential.
For Examples Everybody, when free falls down on the surface of earth.To undestand this natural phenomenon , we must know why the body falls.To understand this natural phenomenon ,
1) we must know why the body fall? .
2) with what velocity does the body fall?
3) Is this velocity a constant?
4) what is the time taken by the body to reach the ground?
5) Does this time depend upon a mass of body?
To anwser all these question , measurement of distance ,time, mass etc are essential.In almost every physical situation we realise the necessity of measurement.
we can understand the physics and physics law and its application only by solving them.
Lord Kelvin once remarked that" when you can measure what you are speaking about and express it in number ,you know something about it; but when you cannot express it in numbers, your knowledge is merge and unsatisfactory kind''.
Students can learn to solve various Physics problems from the expert Physics tutors available online.
Physics Problems and Solutions
The following are some Physics problems and solutions. Students can get similar solutions for their Physics Problems online.
Example from a uniform motion:
Example1: A man walks on a straight road from his home to a market 2.5 km away with a speed of 5 km/hr. Finding the market closed, he is instantly turns and walks back with a speed of 7.5km/hr.
a) What is the magnitude of average velocity.
b) Average speed of the man over the interval of time 0 to 30 min.
Solution1: Time taken by man to go from his home to market,t1 = distance/speed = 2.5/5 = 1/2 h
Time taken by man to go from market to his home t2 = 2.5/ 7.5= 1/3 h
therefore, Total time taken :t1 + t2 = 1/2 + 1/3 = 5/6 h
(i) 0 to 30 min
(a) Average velocity = Displacement / Time
= 2.5 / 1.2 = 5 km/hr
(b) Average speed = Distanced / Time
= 2.5 / 1/ 2= 5 km/hr
Law of motions:
Example1: A force act for 8 seconds on a body of mass 10 kg .The force then stop acting and the body describes 80 m in the next 5 sec.Find the force.
Solution: here, m = 10 kg ; t=8 sec
After the force stop acting the body moves with a uniform velocity given by
v = Distance travelled / time taken = 80/5 = 16 m/s
Initial velocityof the body , u =0
From v=u+at
16 = 0 + a x 8 or a = 2 m/s2
As F = ma
Therefore = 10 x 2= 20 N
Students can get help with Physics homework problems too from the online tutors.
How to Solve Physics Problems
Let us now learn How to solve physics problems. Students can follow the same steps to solve similar problems in Physics.
Steps for solving physics problem
Different problems in physics are related to different laws and concept.for such
- For question based on simple motion ,use kinemaetic definition of velocity and acceleration.
- For question related to force involved and object interact due to force, use newton law of motion and so on..
Focus on a problem
Draw rough figure. label the diagram
Use the appropiate laws and formulaes
Do calculation by taking appropriate value.
Put the desire unit.
Students can also get help with other branches on Science from the Science help page available online.