6 W 0 Given: • W = 25 Newtons Find: • F = 38 Newtons .0 = 14 degrees • Mk = velocity kinetic friction coefficient if block slides with constant • Written work: Show which way block is sliding, and which direction friction is acting in
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- A horizontal force of 8.0-newtons is used to pull a 20.-newton wooden box moving toward the right across a horizontal wood surface, as shown. (a) F = 8.0 N 20. N wooden box Wood Calculate the magnitude of the friction force acting on the box. Show all work, including the equation and substitution with units B iU O AA E E X ¶- ® A: DELAUG-4 A child is on a swing with a rope length of 5.00m. The child starts at rest at a position where the angle between the rope and the vertical is 30.0°. At the bottom of the swing, when the rope is vertical, the speed of the child V is unknown. Find the final speed vf in m/s, using conservation of mechanical energy. at rest Tree branch 5.00m 30.0⁰ 5.00m V₁The New Yorker FlC. CommonLit | MY A. • Total Energy-Gravitational Potential Energy+ Kinetic Energy-100% • The percentage of GPE and KE can change as object moves down or up, but the total energy remains constant. • Assume no friction (loss of energy by heat) %3D %3D 1. Conservation of Energy of a Freefalling Object. A ball is initially suspended above the ground at position A. The ball is released, it freefalls from position A to position F. At position F, the ball impacts the ground. Answer the questions about the conversion of GPE to KE as the ball freefalls to the grousd. Air resistance is absent. Choose the best answer that describes the energy relationship of the falling ball. B 1. At Position A A. TOT E-100% GPE +0KE B. TOT E 0 GPE + 100 % KE C. TOT E 50% GPE + 50% KE D. GPE > KE E. GPE KE E. GPE KE E. GPE