a. A box slides up and down a very smooth ramp.
b. A baseball player slides into second base.
c. A burner heats water to the boiling point.
d. A burner heats a gas. The molecules move faster.
9.2 Work and Kinetic Energy for a Single Particle
2. On the axes below, draw graphs of the kinetic energy of:
a. A 1000 kg car that uniformly accelerates from 0 to 20 m/s in 20 s.
c. A 1000 kg car that drives once around a 130-m-diameter circle at a speed of 20 m/s.
Calculate K at several times, plot the points, and draw a smooth curve between them.
c. K (a. KJ b. K (J
200000 250,000 200,000 200,000 200,000
150,000 150,000 150,000
100,000 100,000 100,000
50,000 50,000 50,000
-1 (s) 1 (s) 1 (s) 0 10 15 20 0 10 15 20
Exercises 3-10:
For each situation:
- Draw a before-and-after pictorial representation
- Draw and label the displacement vector
- Draw a free-body diagram
- Fill in the table by showing the sign (+ or -) or O of the quantities listed.
3. An elevator moves up at constant speed.
Wien Wgrav Wiot AK