Physics > QUESTIONS & ANSWERS > Particle Models in Two Dimensions Worksheet 1: Free-Fall Kinematics -Questions and Answers (All)

Particle Models in Two Dimensions Worksheet 1: Free-Fall Kinematics -Questions and Answers

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Particle Models in Two Dimensions Worksheet 1: Free-Fall Kinematics Note: For questions in which the object only moves downward, some teachers may elect to make downward (+) to reduce the number of... (-) signs students have to deal with. For question 1, parallel solutions are provided. For #5 and #6 down is (+). 1. A ball is thrown downward with an initial speed of 20 m/s on Earth. a. Make a labeled diagram (specify the (+) direction), then make a motion map of the situation. b. What is the acceleration of the ball? Ignoring air friction, the ball accelerates at g which is -10 m/s/s c. Calculate the displacement during the first 4.0 s. 2   1 2 2 2 5 4.0 (20 )4.0s 160 i m m s s y at v t y s m         or, if y−5 m s 2 4.0s 2  −20 m s 4.0s−160m d. Calculate the time required to reach a speed of 50 m/s.   2 50 20 3.0 10 f i f i m m s s m s v v v v a t t a t s          or e. Calculate the time required to fall 300 m (Hint: factor the quadratic or use the quadratic formula). 2 1 1 2 2 2 2 1 2 2 0 (10 ) 20 300 0 ( 6)( 10) 0 6.0 i i m m s s y at v t at v t y t t m t t t s                    if down is (–), students can still factor the quadratic by multiplying by -1 to make the leading term (+) −1 1 2 −10 m s 2 t 2 −20 m s  t 300m 0 t−6t100 t [Show More]

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