Applying the law of energy conservation

What kind of energy is represented in the picture?

The Law of Conservation of Energy states:

Which is an example of mechanical energy?

A body is released from a point 100 m above the ground. What is the velocity of the body just before hitting the ground? 

During a certain time interval, a 20-N object free-falls 10 meters. The object gains _____ J of kinetic energy during this interval.

A car moving 50 km/hr skids 15 meters with locked brakes. How far will the car skid with locked brakes if it is moving at 150 km/hr?

The energy possessed by an oscillating pendulum of a clock is

A heavyweight is suspended from a spring. The energy stored in the spring is E. If the weight is raised till the spring comes to its unstretched position and the work done in doing so be W, then the gain in gravitational potential energy of the weight will be

When driving a car, the chemical energy in gasoline is converted to heat (thermal energy) in the engine. Most of this thermal energy is then converted to mechanical energy, which makes the car move. What happens to the rest of the thermal energy?

Two men are standing on either side of a box pushing against each other. They each push for 30 seconds but do not move the box. The men applied _____________ but no _____________ was done.

An apple hanging from a limb has potential energy because of its height. If it falls, what becomes of this energy just before it hits the ground?

A toy helicopter blades spin when its circuit is connected to a battery. Which sequence shows the energy changes taking place in the helicopter?

Bob has an electric motor and a generator. Which pairs of energy terms are the most closely related to the development of a motor and a generator?

_________ happens when a force causes an object to move in the same direction that the force is applied.

What type of energy transfer occurs when the heat in the sand transfers to the person's feet?