Conservation of Energy

Conservation of Energy Principles

Articles
Title
As shown on the right, a block of mass 7.2 kg is connected through a pulley, to a spring with spring constant 28 N/m. Initially, the mass is held at a level which leaves the spring unstretched. How far down will m go when released?
A ballistic pendulum apparatus is set up. A bullet is fired at 125 m/s into a 1.5 kg block of ballistic gel. The bullet is embedded in the gel, and together the gel and the bullet rise 0.010 m into the air. What is the mass of the bullet?
An object has 50 J of gravitational potential energy when it is 10 m off the ground. How much kinetic energy will a twice-as-massive object have if it is held 20 m off the ground?
A pendulum, made of a mass 5.5 kg, is tied to the end of a string of length 60 cm as shown in the figure to the right. This position is called the “equilibrium” or “relaxed” position of the pendulum. If pulled and released, the pendulum can swing freely f
A 0.75 kg block is held at rest against a spring compressing it 27.0 cm. The spring constant is 735 N/m. The block is released and it begins to move toward a loop across a frictionless surface. How much kinetic energy does the block have when the spring i
A block of mass 2.2 kg can slide along a curved track as shown on the right. The block, initially at a height of 5.6 m above the ground is released. It slides down a track which is all frictionless, except for a rough zone having a length of 0.56 m. In th
Two 500-g air cars are on a frictionless track. Car A is moving at 0.2 m/swhen it collides into Car B, which is at rest. Both cars move away at0.1 m/s. Compared to the total energy of the system before the collision, what percentage of energy is transferr

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