Chapter Unit - 1 : Force, Work, Energy and Power - Contact and Non-contact Forces - Frank Solutions for Class 10 Physics ICSE
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Chapter 1 - Force, Work, Energy and Power - Contact and Non-contact Forces Excercise 10
(i) Pushes (ii) pulls
(iii) Lifts (iv) resists
(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.
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
1 newton = 1kg x 1 ms-2
= 1000 g x 100 cms-2
= 105 dyne
e.g. An iron ball suspended from a hook by a wire, a book kept on a table.
e.g. If you push a ball, it starts to roll; Applying a force to stop a cricket ball.
(i) tension in the string,
(ii) magnetic force,
(iii) normal reaction force,
(iv) gravitational force of attraction,
(v) force of attraction between unlike charges.
(ii) Non-contact force
(iii) Contact force
(iv) Non-contact force
(v) Non-contact force
= 1 kg mass x acceleration due to gravity g in ms-2
= g newton
1 kgf = 9.8 newton
1 kilogram force (kgf) = 9.8 newton
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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