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# 021b - —*— I Assuming air resistance to he negligihte...

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Unformatted text preview: —*— I Assuming air resistance to he negligihte, the only acceleration on a projectile in ﬂight is due to gravity: 3 = ”'3. The acceleration due to gravity only affects the vertical component of the velocity. The horizontal component is constant for the entire trajectory. I The key to many projectile motion problems is knowing that the vertical velocity is zero at the peak. knovvi ng the initial vertical component of the velocity and the acceleration due to to gravity [1i] mist {9.3 mist”, we can determine how long it takes the projectile to reach the peak. The time needed by gravityr to deplete the initial vertical velocity to zero is the time to the peak, rP. = i 1’ at How, it is a simple matter to ﬁnd the height of the peak using the time to reach the peak, rF, in the formula 3;: v”: — £31: and the range using the formula .1: = v1.1: [the time to land is exactly double the time to reach the peak}. ALMEEI' WATS. THE FIRST STEP WITH A PRUJEETILE M'DTIEIH PR'DBLEM IS TID SEPARATE CFUT THE HDRIZCIHTAL AND 1'I"EI1TI:i-'IAL EWEHTS l|.T.|'F THE ‘IE'ELDL'ITT. Em .J WHEEL ...
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