Frank Modern Certificate Solution for Class 10 Physics Chapter Unit - 1 - Force, Work, Energy and Power - Contact and Non-contact Forces
Frank Textbook Solutions Chapter Unit - 1 - Force, Work, Energy and Power - Contact and Non-contact Forces
Frank Textbook Solutions are considered extremely helpful for solving difficult questions in the ICSE Class 10 Physics exam. TopperLearning Textbook Solutions are compiled by our subject experts. Herein, you can find all the answers to the questions of Chapter Unit - 1 - Force, Work, Energy and Power - Contact and Non-contact Forces for the Frank textbook.
Frank Textbook Solutions for class 10 are in accordance with the latest ICSE syllabus, and they are amended from time to time to be most relevant. Our free Frank Textbook Solutions for ICSE Class 10 Physics will give you deeper insight on the chapters and will help you to score more marks in the final examination. ICSE Class 10 students can refer to our solutions while doing their homework and while preparing for the exam.
Frank Modern Certificate Solution for Class 10 Physics Chapter Unit - 1 - Force, Work, Energy and Power - Contact and Non-contact Forces Page/Excercise 10
A force is that physical force which changes or tends to change the state of rest or state of motion of the body. It can start or stop the body. It can change the speed or direction or both of body. It can bring about change in dimensions of the body.
Contact forces are forces which come into play when the bodies come into physical contact with each other, e.g. frictional forces, force of normal reaction. These forces are produced by way of action and reaction.
Non-contact forces are forces which act on the bodies through the empty space without coming into any physical contact. Also known as action at a distance force or field forces, for example: gravitational forces, electrostatic forces.
(i) We push a door to close it.
(ii) A railway engine pulls a train
(iii) The force that a passenger applies to put a luggage on the platform into the train is a lifting force.
(iv) When we try to move heavy roller, it resists our effort to move it.
When a normal spring held between the hands is pulled outward, we stretch it.
we push a piston fitted inside a cylinder containing gas, we compress the gas.
1 kgf = 9.8 newton
The SI unit of force is 'newton'.
One newton is the force which when acts on a body of mass 1kg, produces an acceleration of 1ms-2, i.e.
1 newton = 1 kg x 1ms-2
In CGS system, the unit of force is 'dyne'.
1 newton = 1kg x 1 ms-2
= 1000 g x 100 cms-2
= 105 dyne
1 kgf = 9.8 newton
When a balloon is inflated the force of air inside changes it shape or size.
The magnitude of a non-contact force depends upon the distance between the two objects.
When the resultant of a group of forces acting on the same object is zero, the forces are said to be balanced. Balanced forces do not change the speed of stationary objects. They may deform objects.
e.g. An iron ball suspended from a hook by a wire, a book kept on a table.
When the resultant of a group of forces acting on the same object is not equal to zero, the forces are said to be unbalanced. An unbalanced force changes the state of constant velocity including zero velocity of a body on which it acts.
e.g. If you push a ball, it starts to roll; Applying a force to stop a cricket ball.
(i) Contact force
(ii) Non-contact force
(iii) Contact force
(iv) Non-contact force
(v) Non-contact force
1 kgf = force due to gravity on 1 kg mass
= 1 kg mass x acceleration due to gravity g in ms-2
= g newton
1 kgf = 9.8 newton
It means that 1 kgf or one kilogramme force is the force due to gravity on 1 kilogram mass.
Effects a force can produce and examples:
1. Change the state of rest; e.g. pushing a door to open it or close it.
2. Change the state of motion; e.g. applying a force to stop the cricket ball.
3. Change the direction of motion and not speed; e.g. when a force is applied to move a body in a circular path with uniform speed there is only a change in direction of motion but speed remains constant.
4. Change both speed and direction of motion; e.g. when a body is swirled in the vertical circle its direction of motion and speed changes at every point.
5. Change the dimension; when a balloon is inflated the force of air inside changes its shape or size.
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