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October 22 - Lecture
Kinetic Energy – Energy of motion
- Provided v << c
Conservative Force – A force whose work on an object
depends only on the initial and final location of the object
and not upon the path of the displacement.
Examples: gravitation, springs
Non-Conservative Force – Any force that is not
Example: friction
Potential Energy (Positional Energy) – Change in potential
energy for a particular type of conservative force is the
negative of the work done by t conservative force over the
displacement. PE is the fast way to calculate the work done
by a conservative force.
Work Energy Theorem – It is the connection between
Newton’s Second Law and Work & Energy.
Mechanical Energy – E
Conservation of Mechanical Energy
Each type of work is related to a type of energy transfer.
The only force acting on a 1.9 kg body as it moves along the x axis varies as shown
below. The velocity of the body at x = 0 is 4.0 m/s.
What is the initial kinetic energy of the body?
How much work was done on the body as the block was displaced 4
What is the maximum kinetic energy obtained by the body?
A 260 g block is dropped onto a relaxed vertical spring that has a spring constant
of k = 2.1 N/cm. The block becomes attached to the spring and compresses the
spring 14 cm before momentarily stopping.
While the spring is being compressed, what work is done on the block by
the gravitational force on it?
What work is done on the block by the spring force while the spring is being
What is the speed of the block just before it hits the spring? (Assume that
friction is negligible.)
Show that a block released from rest at the top of a frictionless
hemisphere of radius R will leave the surface at an angle of
as measured with respect to the vertical.
In the figure below, a small block of mass m = 0.033 kg can slide along the
frictionless loop-the-loop. The block is released from rest at point P, at
height h = 5R above the bottom of the loop. (The height of the loop
is R = 30 cm.)
What is the magnitude of the horizontal component of the net force acting on
the block at point Q?