Which of the following is NOT an example of potential energy? a. A running woman b. An incredibly compressed spring c. A tightly stretched rubber band d. An apple dangling off a branch A ball drops from a height h. What more do we need to calculate initial potential energy? a. Elasticity of the Ball b. Mass c. Final Velocity d. Horizontal Displacement
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
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- Identify each situation as: WORK IS DONE or WORK IS NOT DONE a.A teacher applies force to a wall and becomes exhausted. b.A book falls off the table to the ground. c.A rocket accelerates through spaceA baseball hits the catcher’s glove with a horizontal velocity of 55m/s. The mass of the baseball is 0.15kg. The displacement of the ball due to the deformation of the catcher’s glove and the movement of the catcher’s hand is 23cm from the instant the ball makes contact with the glove until it stops. a. How much kinetic energy does the baseball have just before it strikes the glove? b. How much work does the catcher have to do to the ball during the catch and is it positive or negative? c. What is the average impact force exerted by the glove on the baseball? Answer parts a-c. Include units and direction.1. Which of the following is NOT an example of potential energy? a. A running woman b. An incredibly compressed spring G. A tightly stretched rubber band d. An apple dangling off a branch 2. A ball drops from a height h. What more do we need to calculate initial potential energy? a. Elasticity of the Ball b. Mass c. Final Velocity d. Horizontal Displacement
- 2. A ball is dropped from the top of a building. You choose the top of the building as a reference point while your friend chooses the bottom as the reference point. Explain whether the energy calculated using the two different reference points are same or different. a. The ball PE at any point b. Change in PE as a result of the fall KE at any point C.1.) A 15 kg mass is dropped from rest a distance of 18 m above the ground. Make certain you show all your work: a. Draw a picture. b. Indicate on your drawing where KE = 0 and where PE = 0 c. Using Conservation of Energy determine the final speed of the object just before it strikes the ground. d. Next, again showing all your work, use 1-dimensional Kinematics to solve the same problem. e. Which method, in your opinion is easier?Choose all that apply to potential energy. A. Potential energy can be negative. B. Potential energy is measured in the units of Joules. C. Energy that something possess because of its position. D. Potential energy is measured in the units of Nm.
- An object is initially held at rest from a height of 4 m. The object is then released. A. Use conservation of energy to find the velocity right before it hits the ground B. Use the position equation to find the time it takes to reach the ground.a. Gravitational potential energy and mechanical energy Ob. Potential energy and mechanical energy c. Gravitational potential energy and kinetic energy Od. Potential energy and kinetic energy Clear my choice When a stone is dropped from a bridge to a river below, what happens to the gravitational potential energy halfway down? f 2 Select one: O a. The stone has half the amount of gravitational potential energy and double the amount of kinetic energy. O b. The stone has half the amount of gravitational potential energy and half of it has been converted to kinetic energy. O C. The stone gains momentum, and its potential energy decreases and its kinetic energy increases. O d. The stone gains momentum, and its potential energy decreases. Jamie pulls an elastic band that has a spring constant of 45 N/m, producing a 3.0 J increase in potential energy. How far did Jamie hpA child has two red wagons, with the rear one tied to the front by a stretchy rope (a spring). If the child pulls on the front wagon, the ____ increases. a. kinetic energy of the wagons b. potential energy stored in the spring c. both A and B d. not enough information
- 2. Consider the concepts of kinetic energy (KE) and gravitational potential energy (GPE) as you complete these questions. A ball is held 1.4 meters above the floor. Use the terms KE of GPE as your answers. A. When the ball is held motionless above the floor, the ball possesses only B. If the ball is dropped, its energy decreases as it falls. C. If the ball is dropped, its energy increases as it falls. D. In fact, in the absence of air resistance, the amount of impact with the floor. energy. energy when the ball is held motionless above the floor equals the amount of energy atAt its maximum speed, a 4 kg sloth can climb a height of 6 m in 2 minutes. A. What is the primary energy transformation that is taking place? B. What is the force required for the sloth to climb at a constant speed? C. How much work does this sloth do climbing the tree? D. How much does the potential energy increase?Question 6 When a student stretches a spring, what is the flow of energy? a. Energy goes into the spring and into the student. X b. There is no change in the energy of the spring, only for the student. c. There is no change in the energy of the student, but there is a change for the spring. d. Envery leaves the spring and goes to the student. e. Energy goes into the spring from the student.