Spring-flowering shrubs and trees must be exposed to several months of cold temperatures before they can bloom. Which means ...

An elastic object, such as a spring, stores elastic potential energy when stretched or squashed. The extension of an elastic object is directly proportional to the force applied. This equation ...

Newton's third law then tells us that the known force is the same as the weight. A spring balance will stretch until the force from the spring is enough to balance the weight of the object ...