09_12_Projectile_2

# 09_12_Projectile_2 - Newtons 2nd Law It tells us how much...

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9/12 Free Fall, Projectile Motion / Text sections and 1.6-8 , 3.1-2, and 4.3 / HW Do the suggested problems below No HW will be collected this week or Monday / Lab: “Vector Exercise” Let’s talk about this / Suggested problems: 3-25, 27, 30 Use concepts, not equations!!!

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g is not the “accel. of gravity” g is always a “field strength”, not an acceleration! It tells us how much force (in Newtons) is on an object and depends on the object’s mass. Weight = mass x g An object in free fall (or in projectile motion) has only the weight force on it as nothing else is touching it.
g is not the “accel. of gravity”

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Unformatted text preview: Newtons 2nd Law It tells us how much acceleration an object has and depends on the objects mass as well as the force on the object. acceleration = force mass Be careful: g = 9.8N/kg and for free fall a = 9.8m/s 2 but it is dangerous to think of g as an acceleration. More on this later. a = W/m = mg/m = g a = g in number, not in concept! Projectile Motion Example: An object is thrown straight up with a velocity of 4m/s. The acceleration is 9.8m/s 2 directed down. How long is the object in the air? How high does it get? What is its velocity when it gets back to the ground?...
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## 09_12_Projectile_2 - Newtons 2nd Law It tells us how much...

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