PHY165 Physics Modules 4 Exam Study Questions with Correct Answer | Guarantee Pass

PHY165 Physics Modules 4 Exam Study Questions with Correct Answer | Guarantee Pass 1. Which TWO of the following will NOT affect the amount of work you do in lifting a book onto a shelf? - ANSWER The path that the book takes as you lift it to the shelf, and the time it takes you to lift it to the shelf 2. What is the process of producing change in the environment called? A) Energy B) Force C) Power D) Work - ANSWER D) Work 3. What is the unit of both energy and work? - ANSWER JOULES 4. Which of the following changes will decrease the amount of work done by a force - ANSWER a) Make the force as large as possible b) Increase the angle between the force and the displacement c) Apply the force over a larger displacement d) Apply the force in the same direction as the displacement Answer: B 5. Which of the following could be a unit for power? A) Candelas B) Horsepower C) Amperes D) Volts - ANSWER B) Horsepower (and Watts) 6. Which of the following changes will maximize the work done by a force? - ANSWER Apply the force in the same direction as the displacement 7. How can a waiter apply a force to a tray and NOT do any work on it? - ANSWER Either apply the force in a direction that is perpendicular to the displacement, have no displacement 8. When the energy of a system decreases, what type of work is most likely done ON that system? - ANSWER zero work 9. When the energy of a system increases, what type of work is most likely done ON that system? A) Positive work B) Negative work C) Zero work D) There is no relationship between work and energy - ANSWER A) Positive work 10.Explain why that force does no work. - ANSWER Large amount of GRAVITATIONAL FORCE and normal force, but no DISPLACEMENT, so no work has been done 11.True or False: A football is kicked into the air. As it rises, its kinetic energy decreases and its gravitational potential energy increases. - ANSWER true 12.If you wanted to make the kinetic energy of a thrown ball larger, which TWO of the following changes would make the kinetic energy of the ball FOUR times bigger? - ANSWER Make the mass of the ball four times bigger, and Double the speed of the ball 13.Which of the following forces is NOT an example of a conservative force? A) Gravity B) Electric C) Magnetic D) Friction - ANSWER *D) Friction* examples of conservation force Gravity, Electric, Magnetic, Elasticity 14.True or False: To increase the gravitational potential energy of an object, I could increase its mass. - ANSWER True increases the gravitational potential: Increase the height of the object above the reference frame Increase the mass of the object 15.True or False: Object A has a velocity of 4.0 m/s, and Object B has a velocity of 2.0 m/s. Object A must have the larger kinetic energy. - ANSWER False 16.Which of the following statements is the best description of energy? A. Energy is the ability of an object to do work. B. Energy is the ability of an object to produce change in the environment or change in the object itself. C. Both A and B D. Energy is the rate of doing work. - ANSWER C. Both A and B y is the ability to do work, or the ability to produce change in the environment or the object itself 18.Which of the following is NOT true according to the Law of Conservation of Energy? A) Energy cannot be destroyed. B) Energy cannot be created. C) Energy cannot change forms. D) Energy can be converted from one form to another. - ANSWER C) Energy cannot change forms. 19.Energy cannot be created or destroyed, only transformed from one form to another 20.During a workout, an athlete pulls a pile bricks horizontally with a force of 426.0 N across the floor that is 25.0 m long. Answer the following questions about this scenario: a. Calculate the amount of work done on the pile of bricks by the athlete. b. What equation can be used to calculate the work done by the athlete on the pile of bricks? c. If the athlete completes another rep but this time applies the same 426.0 N force an angle of 25.0∘above horizontal, how much work does she do now? d. Calculate how much work gravity does on the pile of bricks if the mass of the bricks is 105 kg. e. If the athlete moves the bricks at a constant speed during all of the reps, what is the net work done on the bricks during any of these trials? - ANSWER A) W = FΔdcosΘ = (426.0 N)(25.0 m)cos(0∘) = 10,700 J B) 2 C) W = FΔdcosΘ = (426.0 N)(25.0 m)cos(25.0∘) = 9650 J D) 0 since the force is perpendicular to the displacement E) 3 since the kinetic energy does not change