Define acceleration in physics.
A stone falls vertically from the top of a cliff. Fig. 2.1 shows how the stone’s velocity $v$ changes with time $t$. Explain the shape of the curve in Fig. 2.1, referring to the forces acting on the stone.
Use Fig. 2.1 to determine the stone’s speed when the resultant force acting on it is zero.
Using Fig. 2.1, calculate the approximate height fallen by the stone between $t = 0$ and $t = 30\,\text{s}$.
On Fig. 2.2, sketch how the stone’s acceleration $a$ varies with $t$ between $t = 0$ and $t = 30\,\text{s}$.
Using Fig. 2.1, calculate the approximate height fallen by the stone between $t = 0$ and $t = 30\,\text{s}$.
On Fig. 2.2, sketch how the stone’s acceleration $a$ varies with $t$ between $t = 0$ and $t = 30\,\text{s}$.