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Chapter 11. 5. There is no transformation because energy is conserved. A child slides down a playground slide at constant speed. The energy transformation.

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Presentation on theme: "Chapter 11. 5. There is no transformation because energy is conserved. A child slides down a playground slide at constant speed. The energy transformation."— Presentation transcript:

1 Chapter 11

2 5. There is no transformation because energy is conserved. A child slides down a playground slide at constant speed. The energy transformation is

3 5. There is no transformation because energy is conserved. A child slides down a playground slide at constant speed. The energy transformation is

4 A particle moving along the x-axis experiences the force shown in the graph. If the particle has 2.0 J of kinetic energy as it passes x = 0 m, what is its kinetic energy when it reaches x = 4 m? 1. – 2.0 J J J J J

5 A particle moving along the x-axis experiences the force shown in the graph. If the particle has 2.0 J of kinetic energy as it passes x = 0 m, what is its kinetic energy when it reaches x = 4 m? 1. – 2.0 J J J J J

6 1. W g is positive and W T is positive. 2. W g is negative and W T is negative. 3. W g is positive and W T is negative. 4. W g and W T are both zero. 5. W g is negative and W T is positive. A crane lowers a steel girder into place at a construction site. The girder moves with constant speed. Consider the work W g done by gravity and the work W T done by the tension in the cable. Which of the following is correct?

7 1. W g is positive and W T is positive. 2. W g is negative and W T is negative. 3. W g is positive and W T is negative. 4. W g and W T are both zero. 5. W g is negative and W T is positive. A crane lowers a steel girder into place at a construction site. The girder moves with constant speed. Consider the work W g done by gravity and the work W T done by the tension in the cable. Which of the following is correct?

8 Which force does the most work? 1. The 6 N force. 2. The 8 N force. 3. The 10 N force. 4. They all do the same amount of work.

9 Which force does the most work? 1. The 6 N force. 2. The 8 N force. 3. The 10 N force. 4. They all do the same amount of work.

10 A particle moves along the x-axis with the potential energy shown. The force on the particle when it is at x = 4 m is 1. 4 N N N. 4. –1 N. 5. –2 N.

11 A particle moves along the x-axis with the potential energy shown. The force on the particle when it is at x = 4 m is 1. 4 N N N. 4. –1 N. 5. –2 N.

12 A child at the playground slides down a pole at constant speed. This is a situation in which 1. U E th. E mech is conserved. 2. U K. E mech is not conserved but E sys is. 3. K E th. E mech is not conserved but E sys is. 4. U E th. E mech is not conserved but E sys is. 5. U W ext. Neither E mech nor E sys are conserved.

13 A child at the playground slides down a pole at constant speed. This is a situation in which 1. U E th. E mech is conserved. 2. U K. E mech is not conserved but E sys is. 3. K E th. E mech is not conserved but E sys is. 4. U E th. E mech is not conserved but E sys is. 5. U W ext. Neither E mech nor E sys are conserved.

14 Four students run up the stairs in the time shown. Rank in order, from largest to smallest, their power outputs P a to P d. 1. P b > P a = P c > P d 2. P d > P a = P b > P c 3. P d > P b > P a > P c 4. P b > P a > P c > P d 5. P c > P b = P a > P d

15 Four students run up the stairs in the time shown. Rank in order, from largest to smallest, their power outputs P a to P d. 1. P b > P a = P c > P d 2. P d > P a = P b > P c 3. P d > P b > P a > P c 4. P b > P a > P c > P d 5. P c > P b = P a > P d

16 Chapter 11 Reading Quiz

17 1. law of conservation of energy. 2. work-kinetic energy theorem. 3. kinetic energy equation. 4. weight-kinetic energy theorem. The statement K = W is called the

18 1. law of conservation of energy. 2. work-kinetic energy theorem. 3. kinetic energy equation. 4. weight-kinetic energy theorem.

19 The transfer of energy to a system by the application of a force is called 1. Dot product. 2. Power. 3. Work. 4. Watt. 5. Energy transformations.

20 The transfer of energy to a system by the application of a force is called 1. Dot product. 2. Power. 3. Work. 4. Watt. 5. Energy transformations.


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