Which statement best describes the law of conservation of energy?, Energy can be created but not destroyed., Energy can be destroyed but not created., Energy cannot be created or destroyed; it can only be transferred or transformed., Energy is always converted into kinetic energy., A ball is held at a height above the ground. Which energy store is greatest before it is released?, Kinetic energy, Gravitational potential energy, Thermal energy, Sound energy, A ball falls freely from a height. As it falls, its gravitational potential energy decreases. What happens to its kinetic energy, ignoring air resistance?, It decreases., It remains constant., It increases., It becomes zero., An object has 200 J of gravitational potential energy at the top of a frictionless ramp. What is its kinetic energy at the bottom if it starts from rest?, 0J, 100J, 200J, 400J, A student claims, “The total energy of a bouncing ball decreases after every bounce.” Which response best evaluates this claim?, Correct, because energy is destroyed during each bounce., Incorrect, because the total energy of the ball and its surroundings is conserved, although the ball's mechanical energy decreases., Correct, because sound and heat are not forms of energy., Incorrect, because the ball always returns to its original height.

Plenary

per en/la
Imprimir
Incrustar

Tauler de classificació

Estil visual

Opcions

Canvia de fonament

Restaurar desada automàtica: ?