Ametal box, attached to a small parachute, is dropped from a helicopter. explain in terms of the forces acting; why:
(i) its velocity increased immediately after being dropped
(ii) it reached a uniform velocity after a short time

In a closed system, the total energy prior to an energy transformation is the total energy after. a. equal to b. unrelated to c. greater than d. less than

Aferris wheel is a vertical, circular amusement ride with radius 9 m. riders sit on seats that swivel to remain horizontal. the ferris wheel rotates at a constant rate, going around once in 9 s. consider a rider whose mass is 56 kg. at the bottom of the ride, what is the perpendicular component of the rate of change of the rider's momentum? at the bottom of the ride, what is the vector force exerted by the seat on the rider?

Free runners jump long distances and land on the ground or a wall. how do they apply newton’s second law to lessen the force of impact?