Question

name: namari intro to force - quiz mon, nov 3

1. which force is involved in forming protons, neutrons and electrons?

a. gravity b. strong nuclear c. weak nuclear d. electromagnetic

1. which force requires physical contact? circle all that apply.

a. field b. normal c. electric d. friction

1. which force does not require physical contact? circle all that apply.

a. field b. normal c. electric d. friction

Explanation:

1. The strong nuclear force holds protons and neutrons together in the nucleus. Gravity is a weak force between masses, the weak nuclear force is involved in radioactive decay, and the electromagnetic force acts between charged particles but not in forming protons/neutrons in the nucleus.
2. Normal force (exerted by a surface on an object in contact) and friction (between two surfaces in contact) require physical contact. Field forces (like gravitational, electric, magnetic fields) and electric force (as a field - like force) can act at a distance.
3. Field forces (e.g., gravitational field, electric field) and electric force (as a non - contact force) do not require physical contact. Normal force and friction require contact.

Answer:

1. b. Strong Nuclear
2. b. Normal, d. Friction
3. a. Field, c. Electric