Question

Which of the following statement is correct?

I. Forces applied on an object in the same direction add to one another

II. If the two forces act in the opposite directions on an object, the net force acting on it is the difference between the two forces

1. Only II
2. Both I and II
3. Neither I nor II
4. Only I

Answer 1

Correct Answer - Option 2 : Both I and II

Concept:

Force

• Force is any push or pull that changes or tends to change

1. the state of rest or motion of the body
2. speed of a body
3. the direction of motion of the body
4. the shape of the body

• Force always acts if two or more body interacts. 
• Force is a vector quantity, which means both its magnitude (strength of force) and the direction of its application should be considered. 
• For example, if two forces are acting in the same direction, their magnitude will be added up. 
• If two forces are acting in the opposite direction, their magnitude will get subtracted. 
• Force is of two types contact force and noncontact force. 
• Contact forces are those types of forces that result when the two interacting objects are in contact with each other physically. 
  • Example: Friction force, tension force, Normal force, etc.
• Non-Contact Force - It is a force that acts on an object without coming physically in contact with it.
  • eg: Gravitational Force, Electrostatic force, Magnetic force. 

Explanation:

So from the above, we can say that:

I. Forces applied on an object in the same direction add to one another.

II. If the two forces act in the opposite directions on an object, the net force acting on it is the difference between the two forces.

So, both statement is correct.