For a moving object, the force acting on the object varies directly with the object's acceleration. When a force of 21 N acts on a certain object, the acceleration of the object is 7 /ms2. If the acceleration of the object becomes

Question

5 /ms2 , what is the force?

Answer 1

Using the formula for direct variation, we know that:

force = constant x acceleration

To find the constant, we can plug in the initial values:

21 = constant x 7

Solving for the constant, we get:

constant = 3

Now that we know the constant, we can use it to find the force when the acceleration changes:

force = constant x acceleration

force = 3 x 5

force = 15 N

Therefore, the force acting on the object when its acceleration is 5 /ms2 is 15 N.