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.
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.
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