Question

Two objects repel each other. This repulsion could be due to

a) frictional force only

b) electrostatic force only

c) magnetic force only

d) either a magnetic or an electrostatic force

24. Which of the following statement is incorrect

a) friction acts on a ball rolling along the ground.

b) friction acts on a boat moving in water.

c) friction acts on a bicycle moving on a smooth road

d) friction does not act on a ball moving through the air.

25. When two forces act in opposite directions, then net force acting two forces

a) sum of two forces

b) difference between two forces

c) both of these

d) none of these

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Answer 1

Answer:

1. (c)

2. (d)

3. (a)

Explanation:

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Answer 2

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Two objects repel each other. This repulsion could be due to

a) frictional force only

b) electrostatic force only

c) magnetic force only

d) either a magnetic or an electrostatic force

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Frictional force is applied along the surfaces and depends on contact. hence it is not a repulsive force.

Electrostatic and magnetic forces can be either attractive or repulsive. Here, when two objects are experiencing repulsive force because there may be an electrostatic force or a magnetic force.

∴ The answer is option D.

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Which of the following statements is incorrect?

(a) Friction acts on a ball rolling along the ground.

(b) Friction acts on a boat moving on water.

(c) Friction acts on a bicycle moving on a smooth road.

(d) Friction does not act on a ball moving through air.

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(a) When we roll a ball on the ground it eventually stops at a particular time due to friction. If friction was not existing then this ball wouldn't stop rolling.

Therefore, this statement is correct but not the answer we require.

(b) When a boat is moving on the water it eventually stops at one point of time.

Therefore, this statement is correct but not the answer we require.

(c) Friction takes place on all type of surfaces. On some surfaces like ice the friction is less whereas on some surface like the road the friction is more. If a bicycle is moving on a smooth road the friction is less but still the friction is present over there.

Therefore, this statement is correct but not the answer we require.

(d) Friction takes place when the ball is moving through the air because the ball can't be flying in the air forever.

Therefore, this statement is incorrect but the answer we require.

∴ The answer is option D.

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When two forces act in opposite directions, then net force acting two forces

a) sum of two forces

b) difference between two forces

c) both of these

d) none of these

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a) When two forces act in same direction then sum of two forces will be net force

b)When two forces act in different directions then difference of two forces will be net force

c)both condition can't applied for one act

d)Option B is looking appropriate

∴ The answer is option B