Abox of mass 22 kg is at rest on a flat floor. the coefficient of static friction between the box and floor is 0.37. what is the minimum force needed to set the box in motion across the floor?

The answer is 80 N because

Force of friction = friction coeff. times weight in newtons

weight = 9.81 (on earth) times mass

.37*9.81*22 = 79.8534

round up to 80

another example of kinetic energy would be,

kinetic energy   >     moving energy

answer   >   letter choice (c),   a hammer falling off a table.

hope that !                                         : )

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.