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Effects of Force
Newton's Second Law
The rate of change of momentum of a body is directly proportional to the resultant force acting on the body and is in the same direction.
Implication:
When there is resultant force acting on an object, the object will accelerate (moving faster, moving slower or change direction).
Summary of Newton's 1st Law and 2nd Law
Newton's First Law:
When there is no net force acting on an object, the object is either stationary or move with constant speed in a straight line.
Newton's Second Law:
When there is a net force acting on an object, the object will accelerate.
Answer:
F = ma
(300) = (150)a
a = 2 ms-2
Answer:
We know that we can find the magnitude of a force by using the formula F = ma. The mass m is already given in the question, but the acceleration is not give directly.
We can determine the acceleration from the formula
\begin{gathered}
a = \frac{{v - u}}
{t} \hfill \\
a = \frac{{25 - 0}}
{5} = 5ms^{ - 2} \hfill \\
\end{gathered}
From the formula
F = ma = (50)(5) = 250N
The force acting on the box is 250N.
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