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PHY 121 Ch 3 Lecture

# PHY 121 Ch 3 Lecture - Lecture 3 Tuesday January 22 1 The...

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1 Lecture 3 Tuesday, January 22

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2 The path of an object moving on the xy plane is a graph of the y- component of its position vector as a function of the x component of its position. The tangent to the y -versus- x graph at any point: 1. has a slope that is equal to the speed of the object. 2. has a slope that is equal to the acceleration of the object. 3. is parallel to the direction of the velocity. 4. is perpendicular to the direction of the velocity.
3 In projectile motion, the horizontal component of the velocity… 1. is constant, but not necessarily zero. 2. is always zero. 3. decreases at a rate of 9.8 m/s 2 . 4. increases at a rate of 9.8 m/s 2

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4 The range of a projectile is: 1. the optimal angle for maximum horizontal travel. 2. the height it reaches when the vertical component of the velocity becomes zero. 3. the horizontal distance it travels. 4. The length of its path.
5 If the acceleration is constant (but not zero)… 1. the trajectory is always parabolic. 2. the trajectory is either parabolic or a straight line. 3. the trajectory is always a straight line. 4. the trajectory is either a straight line, parabolic, or circular.

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6 The generic equations of motion (constant acceleration) x = x 0 + v 0 t ! t 0 ( ) + 1 2 a t ! t 0 ( ) 2 v = v 0 + a x t ! t 0 ( ) v 2 = v 0 2 + 2 a x x ! x 0 ( )
7 Free fall !

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