ACCELERATION IN THE EARTH’S GRAVITATIONAL FIELD

• Projectile – a force acts on an object which starts it moving then it is subject to a constant force while it moves. In most cases this means the object is in free fall in the earth gravitational field.
• An object dropped accelerates vertically downward due to its weight.
• Air resistance affects the motion of objects unequally, according to their cross-sectional area
• Acceleration due to gravity: g (Nkg^-1 and ms^-1)

g=9.81ms^-1

• If the projection is at an angle, resolve the forces to be horizontal and vertical. The SUVAT equations used must be separated to HORIZONTAL and VERTICAL.
• Notes: if throwing a ball up vertically, the final velocity will be 0 ms^-1 at the top of its trajectory.

• The vertical motion is subject to gravity, so -g
• The time for the vertical and horizontal motion is the same.

That's all~ Thanks for watching.

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