Question

1. after the sugar dissolves, which of its physical properties should the student expect to find? a) the sugar remains a liquid b) the sugar crystals will become smaller. c) the sweet taste will not change d) the sugar will become invisible 4. which of the following uses best complete this table? form of energy use light can be used for surgery (lasers) sound emergency warning signals electrical powers our computers thermal heats our food and homes mechanical 5. the best definition of force is ___. a) the amount of space an object takes up b) the ability to do work c) an object that sits still will remain sitting unless acted on by a force d) a pull or push 6. juan’s ball is rolling down the lane toward the bowling pins when it slows down and stops rolling. what is acting on the ball? a) gravity b) mechanical energy c) friction d) push at what temperature will water change state as pictured below? (mark your answer on the grid.) liquid solid

Explanation:

1. For question 3, when sugar dissolves in water, the sugar molecules disperse and become invisible to the naked - eye as they mix with water molecules at a molecular level.
2. For question 4, light energy can be used for surgery (lasers), sound can be used for emergency warning signals, electrical energy powers our computers, and thermal energy heats our food and homes. Mechanical energy is used to open and close doors.
3. For question 5, force is defined as a pull or push.
4. For question 6, when a ball rolling down a lane slows down and stops, friction between the ball and the lane surface acts as a resistive force.
5. Water changes from liquid to solid (freezes) at 0°C.

Answer:

1. D. The sugar will become invisible
2. B. open and close doors
3. D. A pull or push
4. C. friction

Water change - state temperature: 0