What is energy?  Explain why scientists care about this concept as part of their work.

Direction: Solve the following problems. Show your complete solution and box your final answer. A motor vehicle weighing 19,620 N is travelling at 70 km/hr. What is the kinetic energy of the vehicle?

For each type of energy, give an example from the paragraph. When a car is running, it burns gasoline. This makes parts inside the engine move, which makes the car move forward. The engine of the car gets very hot. The engine makes loud noises. The engine is also used to power the headlights and to provide electricity to make the car stereo work. Example of each :: 1. Electrical Energy : 2. Heat Energy : 3. Light Energy : 4. Chemical Energy : 5. Sound Energy : 6. Mechanical Energy :

A car is moving at 10 m/s. a) How fast would the car need to go to double its kinetic energy? b) By what factor does the car’s kinetic energy increase if its speed is doubled to 20 m/s?

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B. Answer the following questions in complete sentence. 1.Is the layman concept of work the same as its scientific counterpart? 2. When is work really done? 3. How can we strategically increase the work done on an object?

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Energy of a Roller Coaster Car 500 450 400 350 2 300 60 250 200 150 100 50 10 Time (s) -Mechanical Energy ... Potential Energy -- Kinetic Energy According to the graph, what is the relationship between the three types of energy? Your answer: Kinetic energy is the sum of mechanical energy and potential energy. Mechanical energy is the sum of kinetic energy and potential energy. Potential energy is the sum of kinetic energy and mechanical energy. The three types of energy are independent.

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 hp

1. Refer to figure 1. The 10.0 kg green cart travels down a ramp - from point A to B. Calculate its starting potential energy, kinetic energy at the bottom of the ramp, and its velocity coming off the bottom of the ramp. If the cart coasts from points B to C, did it do any work? How far up the 2nd ramp does the cart go as measured from the ground? 10.0m Figure 1 B