When you melt a solid the heat creates energy, when you heat up molecules they will move quicker and start to somewhat break apart into a liquid structure.
Answer:
Explanation:
From free falling objects we know that height is equal to:
From the exercise we know that
Being said that, we can calculate how long would it take to the object to hit the ground knowing that the height at that point is 0
Solving the quadratic formula we got that
or
Since time can not be negative the logical answer is <u><em>t=5s</em></u>
So, the object hit the ground at 5s
Answer:
scratching a surface to make it rougher
increasing the size of a flying object
adding extra weight to an object
Explanation:
Friction exists between two surfaces when they are or tend to be in relative motion. This happens due to the interlocking of the microscopic hills and valleys structure of the two surfaces. Friction depends on the roughness of the surface. If a surface is scratched, it can be made more rough and thus, friction would increase. Polishing or oiling the surfaces can reduce friction between them. Friction can also be increased by increasing the weight of the object. It is difficult to move a heavier body. also, with increase in the contact surface, friction increases. Therefore, if the size of a flying object is increased, air drag increases.
the mass of the object determines the amount of inertia in an object
