Question

520/5000

State the hypotheses of the causes of why: of each of the following alternatives.

A) automobile (without gasoline and without brake) slows down and stops;
b) a book that slides on the table slows down and stops;
c) a falling chalk increases its speed until it hits the ground;
d) a ball rolling down a slope increases its speed until it reaches the lowest part;
e) The Moon moves around Earth and moves with approximately constant speed.

Part two:

Design an experiment where you check that the acceleration coincides with the direction of the resulting force.

Answer 1

State the hypotheses of the causes of why: of each of the following alternatives.

a) automobile (without gasoline and without brake) slows down and stops;

Answer: Friction force and resistance from the ground or road slows down the automobile.
b) a book that slides on the table slows down and stops;

Answer: Friction force (resistance from the table surface) slows down the book which was sliding.
c) a falling chalk increases its speed until it hits the ground;

Answer: Its speed increases due to conversion of potential energy into kinetic energy.
d) a ball rolling down a slope increases its speed until it reaches the lowest part;

Answer: Its speed increases due to conversion of potential energy into kinetic energy.
e) The Moon moves around Earth and moves with approximately constant speed.

Answer: Gravitational attraction between Earth and moon which provides the centripetal force remains constant. So, speed of moon is also constant.

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