Resultant Force - Grade-6


Definition of Resultant Force

When two or more forces acting on an object in a straight line then we can add or subtract to get the resultant force on the object.

Definition of Resultant Force

Example :


In The Above Diagram
Case 1: Two forces are acting in same direction, hence to get the resultant force we add the respective forces.
Case 2: Two forces are acting in opposite direction; hence the resultant force is obtained by subtracting the respective forces. Resultant force will act towards the direction of large force.
Case 3: When the forces are balanced (Equal forces are acting in opposite direction to each other), the Vertical forces | Horizontal forces resultant force will be equal to zero.

More About Resultant Force :


  • If the resultant force acting on stationary object is not zero, then the body moved in the direction of the resultant force.
  • Resultant force acting on a body gives the direction of motion of a body.
  • Example: An aircraft is flying at constant height and gaining speed.
  • Four forces are acting on the air craft in four different directions.
    L- Lift due to wings
    R- Air resistance
    W- The weight of the air-craft
    T- The thrust due to the engines.
    Definition of Resultant Force

Which of the following is correct?

A

L = W

T = R

B

L > W

T > R

C

L� = W

T > R

D

L > W

T = R



Correct answer is C.
    Step 1: As the aircraft is moving at constant height, upward force = downward force.
    Step 2: The aircraft is gaining the speed, i.e., forward force is greater than backward force T > R.
    Step 3: Therefore the answer is L = W and T > R.


    Related terms: Force | balanced force | unbalanced force
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