Question

A. True and false
a) Friction opposes the relative motion between two surfaces in contact.
b) A force can act on an object with or without being in contact with it.
c) The force exerted by a charged body on another charged or uncharged body is known
As gravitational force.
d) Magnetic force is a contact force.
e) Force of gravity is an attractive force.

Answer 1

Answer:

1. true
2. false
3. false
4. true
5. false

Explanation:

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Answer 2

The statements are mentioned below -

a) Friction opposes the relative motion between two surfaces in contact. (True)

b) A force can act on an object with or without being in contact with it. (True)

c) The force exerted by a charged body on another charged or uncharged body is known as gravitational force. (False)

d) Magnetic force is a contact force. (False)

e) Force of gravity is an attractive force. (True)

• Friction is a force that opposes an object to slip or slide over another object. It is a contact force. When two objects are in contact with each other and the relative motion starts between the objects, friction acts upon those objects against the relative motion. This is why the statement 'a' is true.
• The statement 'b' is true because a force can act on an object by being in contact with it. Example: Friction, Tension, etc. Also, a force can act on an object without being in contact with it. Example: Gravitational force, Magnetic force, etc.
• The statement 'c' is false because the force exerted by a charged body on another charged or uncharged body is known as electrostatic force. When a charged body (positive or negative) pulls or pushes an uncharged body or oppositely charged body, electrostatic forces are applied.
• Magnetic force is not a contact force because a magnet can pull or push a piece of iron without touching it. So the statement 'd' is false.
• Gravitational force is the force that attracts everything towards the centre of the earth. So it is an attractive force. So the statement 'e' is true.

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