Beginning / Developing Questions 1. Match the units with the quantities: Units Quantities a . Work 1. m/s2 b. Power 2. N C. Force4 3. Kg d. Acceleration due to gravity 4. S e. Mass 5. W f. Time 6. J 2. State all the 3 Laws of motion and provide an example for each one. 3. State the formula and define each variable: a. Force: F= ma i. Where F = force, m = mass, a = acceleration b. Power: P = i. Where P is power, w is work, t is time. c. Work: W = F*d i. Where W = work, F = force, d=displacement 4. Define force and net force. Developing/Proficient: Explain questions 5-10. 5. Newton's 2nd Law states that the net force (total force) is in the same direction as the acceleration. True or false, and why? 6. What is the difference between mass and weight? 7. Using Newton's 2"d Law, define what balanced and unbalanced forces are. 8. A Net force (total force) is 0. Does that only mean that the object is not in motion? 9. Define a machine and why it does not reduce the work. 10. Define the 3 types of levers and explain the differences and similarities. Calculations 11. A block is sliding at a constant speed. What is the net force of the object? (ON) 12. A 5kg block is being pushed with a force of 25N. What is the acceleration of the block? (5m/s2) 13. Calculate the net force on the block if the block is being pushed 15N and there is a frictional force of 5N acting on the block. (10N) 14. Calculate the weight of the 20kg TV. (196N) 15. The block is pushed with a 10N for 5m. Calculate the work of the block. (50J) 16. A 550N student runs up the stairs from the 1st to the 2nd floor. The vertical displacement is 4.1m, and takes 7s to run from the 1st to the 2nd floor. a. Find the work. (2255J) b. Find the power. (322.14W) c. Find the power in Horsepower, HP. (0.432HP) 17. 500J of work was done vertically to move a 20kg stone. What is the displacement of the stone? (2.55m) 18. A 2.68HP crane used 500J to move a rock. Find the time it takes to move the rock. (0.25s)