Worksheet # 5 Work and Power 1. What is the definition of Work in Physics? 2. What is the equation for Work? 3. What are the SI units for Work? 4. Maria and Mary push Henry along a flat level path. Maria pushes the wagon with a force of 50.0 N ( F2) and Mary pushes the wagon with a force of 30.0 N ( F1). The combined mass of Henry and the wagon is 45.0 kg. The girls push the wagon for a distance of 10.0 m See diagram below: A. Determine the combined weight of Henry and the wagon. B. Determine the Normal Force (N) C. Determinant the Force of friction if the coefficient of friction ( M ) is 0.1 D. Determine the net Horizontal force acting on the wagon and Henry. E. Determine the net Work done on the wagon by the girls. (a) ( b ) Work at an angle ( When the force is not parallel to the direction of the displacement) See Formula belowFormula: Angle W = F x d (cose) Work Force distance 5. A student pulls a sled with a mass of 15.0 kg 40.0 m across the ice with an Force of 38.0 N. The rope that is used to pull the sled is 30.0 from the horizontal as shown in the diagram below. Draw a Free Body Diagram 'L 30 15 kg (a) A) What component of the force is being used to pull the sled horizontally across the ice? Assume no friction. B) What is the work done on the sled by the Force of the pull? C) What is the weight of the sled? D)Is the weight of the sled doing work on the sled? Explain? 6. Henry pulls the 100 kg block of ice with a force (F) of 75 N at an angle of 25 degrees to the horizontal. If Henry pulls the block of ice for a distance of 50.0 m how much work does Henry do on the block of ice? B) if it takes 3.0 s to move the ice , calculate the power. 250