Any body that is given initial velocity and then follows a path determined by the effect of the gravitational acceleration and by air resistance (air resistance is usually neglected in physics because we want to make it easier to calculate everything)
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| This image shows an example of a parabolic motion/projectile motion |
Gravity (g or sometimes ag) is always set to 9.81m/s2 on Earth
Without the effects of gravity and air resistance, an object would be able to move forever without stopping unless it bumps into something.
Big 5 Equations
Although the big 5 equations were first used for linear problems, we started to use these for projectile motion. Acceleration is always assumed as 9.81m/s2 unless another acceleration is given.
The velocities are split into x-components and y-components. In parabolic motion, the x-component is the same throughout, i.e if it started with a velocity of 2m/s it will end with a final velocity of 2m/s. However, this is not the case for the y-component as the gravity gives the object acceleration. This acceleration means that the velocity will be either increasing or decreasing depending on the direction that the object is traveling in. Going up would slow it down and vice versa. Therefore, when the object is going down, the y-component will increase as will the displacement.
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