Physics
State whether the following statements are true or false. Correct the false statements.
(a) Force can change the shape and size of an object.
(b) Collision force is a non-contact force.
(c) Friction does not depend on weight of a body.
(d) Lubricating is a method used to increase friction.
(e) Presence of grooves in soles makes it easier to walk.
Force
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Answer
(a) True
(b) False
Corrected Statement — Collision force is a contact force which comes into play when two bodies collide with each other.
(c) False
Corrected Statement — Friction depends directly on the weight of a body such that if the body is heavier, then its frictional force is greater hence, more force will be required to move a heavier body than a lighter one.
(d) False
Corrected Statement — Friction is reduced by lubricating the two surfaces in contact in which substances like oil, grease and powdered graphite known as lubricants form a thin layer between the two surfaces in contact and fill the depressions present on the surfaces which reduces the unevenness of the surfaces and thus friction is reduced.
(e) True
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Related Questions
Observe the given image and answer the following questions.
(a) Is this a method of increasing or decreasing friction?
(b) What are the disadvantages of friction?
Fill in the blanks.
(a) …………… is a push or pull acting on a body that changes the motion of an object.
(b) Force applied does not change the …………… of an object.
(c) …………… and …………… are the two types of unbalanced forces.
(d) Sliding friction is …………… than rolling friction.
(e) Friction is caused due to …………… on the surface of objects.
Match the columns.
Column A Column B 1. Force (a) Polishing 2. Contact force (b) Electrostatic force 3. Non-contact force (c) Push or pull 4. Static friction (d) Normal force 5. Reduction of friction (e) Body at rest Which of the following is a unit of force?
- Metre
- Newton
- Kilogram
- Centimetre