Download (the energy due to rotational motion), and translational (the energy

Energy is the capacity of a physical system to perform work. It is a scalar physical quantity. Energy exists in several
forms such as heat, kinetic or mechanical energy, light, potential energy, electrical, or other forms.
Kinetic energy is the energy of motion. An object that has motion - whether it is vertical or horizontal motion - has
kinetic energy. There are many forms of kinetic energy - vibrational (the energy due to vibrational motion),
rotational (the energy due to rotational motion), and translational (the energy due to motion from one location to
another). We will focus upon translational kinetic energy.
Caution: Equations 7.6 to 7.8 are valid provided #1 force must be constant and # 2
object must be particle like
Figure 7-2
(a) decrease, (b)same, (c) negative, zero
Figure 7-5
The minus sign in Eq. 7-20 indicates that the direction of the spring force is always
opposite the direction of the displacement of the spring’s free end.
The work done by spring force
(a) positive, (b) negative and (c) zero
Figure 7-12
Figure 7-13
Instantaneous direction of motion is tangential
to the path. The work equation = Force x
Distance x cos Ѳ has Ѳ = 90° (right angle) so
that work = 0 and consequently power which =
work/time = 0.
Zero
Wa=(1/2)kx2, for (2 cm, 0.4J)
k=(0.4)x(2)/(2x10-2)2 = 2x103 N/m