What causes "changing" motion? Balanced forces
Unbalanced Forces
Steady Motion
The force​

listen to class

Explanation:

-1

Unbalanced Forces

Explanation:

According to the Newton's First law,  it states that an object either remains at rest or continues to move at a constant velocity, unless it is acted upon by an external force. The answer is Unbalanced Forces

it doesn't. it was imagined up in the middle ages.

note: the given question is incomplete.

complete question is given below.

which is an example of kinetic energy?

a. the energy stored in ethanol  

b. a hockey puck sliding across the ice  

c. a compressed spring  

d. a ball sitting at the top of a ramp

solution: the kinetic energy is the energy posses by the virtue of the motion of the object.

in the given options, a, c and d are the example of potential energy because it is the energy posses by the virtue of the rest of the object. but option b has the kinetic energy as the object is in motion.

hence, a hockey puck sliding across the ice   is the apex example of kinetic energy.

so, the option (b) a hockey puck sliding across the ice   is the correct option.