Textbook Physics 8 "Transformation of Mechanical Energy" ppt pre-class test: 1. Determine whether the kinetic energy and potential energy of an object change under the following conditions? Is it increasing or decreasing? (1) The car goes up at a constant speed along the slope (2) The elevator rises faster and faster (3) The ball falls in the air (4) The car goes forward at a constant speed on the straight road 2. When the bicycle goes downhill, the pedal speed will also increase Faster and faster, in the process, the kinetic energy of the bicycle gradually ___, the gravitational potential energy of the bicycle gradually
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