A mass of 50kg rests on a horizontal plane it has a coefficient of friction of 0.64, what is the minimum force needed? Take acceleration due to gravity as 9.81 m/s2.

313.6N

Explanation:

Given parameters;

Mass of the body  = 50kg

Coefficient of friction = 0.64

Acceleration due to gravity  = 9.81m/s²

Unknown:

Minimum force needed to move the body = ?

Solution:

To move this body, the minimum force must overcome the frictional force. So, the value of force that equals to that of the frictional force will set the body in motion.

 Frictional force  = Umg

U is the coefficient of friction

m is the mass

g is the acceleration due to gravity

  Now insert the parameters and solve;

            Frictional force  = 0.64 x 50 x 9.8  = 313.6N

freezing

deposition

condensation

explanation;

melting also called fusion is the process where solid becomes liquid, sublimation is the process where solid becomes gaseous without first changing to liquid, deposition involves change from gaseous to solid state, freezing involves change from liquid to solid, boiling or evaporation involves change of liquid to gaseous state, while condensation is the change from gaseous state to liquid state.

endothermic reactions involves absorption of heat from the surroundings or the environment while exothermic reactions involves loss of heat energy to the surroundings.

in this case, sublimation, evaporation and melting are endothermic reactions (gain energy from the environment) while, freezing, deposition and condensation are exothermic (loss of energy to the surroundings) reactions.

the force required to move the cart is divided by three or 33.33 n.