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W= 20 kg * 10 N/kg= 200 N. 19 Combining forces

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«Физика пәнін ағылшын тілінде оқып үйрену»

Force acting in the same direction

W= 20 kg * 10 N/kg= 200 N.

Combining forces

A single force which has the same effect as two or more forces acting together is called a

resultant force (R). The forces which from a resultant force are called component forces. Resultant force is found using the following equ1ation;

R  F₁ F₂ F₃ ...

The arrowhead ( ) over each letter shows that it is a vector quantity, which means the quantity also has a direction.

Force acting in the same direction

Let F and F be forces in the same direction, to find the resultant we add the magnitude of the components. The magnitude of the resultant force R is found using;

R  F₁ F₂

Consider two boys, each with the same force trying to lift a box. Then consider a man lifting the same box by himself. The man applies a force twice that of the boy’s to lift the box. Thereforce we can stay that the force applied by the man is the resultant force of that applied by the boys’

The direction of the resultant is the same as the direction of the components.

In the figure below, say F₁ = F₂ = 100 N. We find the resultant force by adding vectors.

First, we add the tail of F₂ to the head of F₁. (Figure 2.25) Let 1 cm represent 100 N.

F₁F₂

b. c.

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