Physics Equations Kinematics



Physics Equations Kinematics

The following are the important kinematics equations list. I will also provide a link to google docs file from where you can download the file as pdf (see at the end of the article).


Physics - Kinematics Equations



Average Velocity and speed

\[v_{avg} = \frac{\Delta s} {\Delta t} \\
\text{Average Speed} = \frac{\text{Total distance}}{\text{time taken}}
\]

Instantaneous velocity and speed

$v = \mathop {\lim }\limits_{\Delta t \to 0} {{\Delta s} \over {\Delta t}} = {{ds} \over {dt}}$
Instantaneous speed or speed is the magnitude of the instantaneous velocity

here $s$ is the displacement of the object and has only one component(out of x, y and z) for motion along straight line and has two components for motion in a plane.

Average acceleration

$${a_{avg}} = {{\Delta v} \over {\Delta t}}$

Instantaneous acceleration

$$a = \mathop {\lim }\limits_{\Delta t \to 0} {{\Delta v} \over {\Delta t}} = {{dv} \over {dt}}$$

Equations of motion (constant acceleration)

$$v = {v_0} + at$$ $$x = {x_0} + {v_0} + {1 \over 2}a{t^2}$$ $${v^2} = {v_0}^2 + 2a(x - {x_0})$$ $$\overline v  = {1 \over 2}(v + {v_0})$$

Free fall acceleration

$$v = {v_0} + gt$$ $$x = {x_0} + {v_0} + {1 \over 2}g{t^2}$$ $${v^2} = {v_0}^2 + 2g(x - {x_0})$$

Projectiles

Horizontal distance $$x = {v_x}t$$
Horizontal velocity $${v_x} = {v_{x0}}$$
Vertical distance $$y = {v_{yo}}t - {1 \over 2}g{t^2}$$
Vertical velocity $${v_y} = {v_{y0}} - gt$$
Here,
${v_x}$ is the velocity along x-axis,
${v_{x0}}$ is the initial velocity along x-axis,
${v_y}$ is the velocity along y-axis,
${v_{y0}}$ is the initial velocity along y-axis.
$g$ is the acceleration due to gravity and
$t$ is the time taken.


Time of flight $$t = {{2{v_o}\sin \theta } \over g}$$
Maximum height reached $$H = {{v_0^2{{\sin }^2}\theta } \over {2g}}$$
Horizontal range $$R = {{v_0^2\sin 2\theta } \over g}$$
Here,
$v_{0}$ is the initial Velocity,
${\sin \theta }$ is the component along y-axis,
${\cos \theta }$  is the component along x-axis.


Uniform circular motion

Angular velocity $$\omega  = {{d\theta } \over {dt}}$$
where $\theta$ is angle moved in radian's
Relation between linear velocity, angular velocity and radius of circular motion $$v=r\omega$$
Angular acceleration $$\alpha  = {{d\omega } \over {dt}}$$
Centripetal acceleration $${a_c} = {{{v^2}} \over r}$$ $${{\vec a}_c} =  - {\omega ^2}\vec r$$

 Get kinematics equation list as pdf (opens in new window)

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