White House Down Physics Concepts - Gravity
In the movie, a helicopter is falling very fast toward the ground, when it hits the ground, it explodes. This demonstrates gravity. Gravity is an attractive force between any two objects that depends on the masses of the objects and the distance between them. When the helicopter hits the ground, there is so much gravitational force that when it does hit the ground, it hits hard enough to explode. When the helicopter was falling, the gravity was causing it to fall at speeds high. The gravity caused the helicopter to fall and explode.