Question

Which of the following forces do not require physical contact with the body to impart an effect?
1. Muscular force
2. Magnetic force
3. Gravitational force
4. Frictional force

• A. Only 1 and 4
• B. Only 2 and 3
• C. Only 2,3 and 4
• D. All 1,2,3 and 4

Answer 1

The correct option is B Only 2 and 3

$\bullet$ Magnetic force and gravitational force are non-contact forces.
$\bullet$ They do not require any physical contact to impart an effect.
$\bullet$ For instance, the Moon experiences an attractive force towards the Earth due to gravity even though there is no physical contact between them.
$\bullet$ Also, like poles of a magnet, when kept close to each other, they repel.
$\bullet$ Whereas frictional and muscular forces being contact forces require physical contact with the body to impart an effect.