Workbook 2 

LESSON 2  Analyzing Data pages 33-74

 COMPLETE Page 33, Page 39 # 8-Answer in the box at the bottom of the page, Page 41, Page 42, Page 47, Page 48, Page 49, Page 55, Page 56, Page 57, Page 73

List five science facts from the articles on pages 53 and 71

ANSWERS

COMPLETE Page 33,

D

The problem says that the ground is level, so the only force moving the mower would be from Stacey.

(Friction and gravity would keep the mower in one place.)

Page 39 # 8-Answer in the box at the bottom of the page,

The object moves 3 meters in 5 seconds, stops for about 6 seconds, then moves another 3 meters in about 4 seconds, stops again for 5 seconds, finally the object goes 6 meters back to where it started in under 10 seconds. 

Page 41-42

3. The box accelerated up to 20m/s. The skateboard remained constant and did not slow down after force was removed

5. The box accelerated quickly to 20m/s. Force was removed, skateboard did not slow down

6.Force needs to be applied in opposite direction to stop the box

8. The fridge accelerated to 20m/s slower. The motion of the skateboard did not slow down

9. Student measure the time it takes to accelerate the masses with the same force, then record the time it takes to move the present. With data collected, students can approximate the mass

10. Answers may vary: Ex: motion of skateboard did not change

11. Answers may vary: the large mass made it harder/effected the motion of the skateboard

Page 42,

Page 47, 

   Changing the surface will change the friction causing easier or more effort to slide past each other

Page 48 -49

1.                Diagram should have a circle with an m in the middle and a connected arrow to the right with an F above the arrow.

2.                Answers may vary: the force to the right is larger, causing the object to move right

3.                Should show a free body diagram with net force to the right but less than F.

4.                Should show a free body diagram with a force on the left that is twice as large as the force right. The net force will then be left half the original size. 

Page 55, 

   2. C

   3. B

   4. C

Page 56, 

5. The friction of the floor is pushing back. The friend needs to push with more force to cause an unbalance. 

6.  The boat will continue across the water for a long distance. Friction will eventually slow the boat to a stop

LESSON 3

Page 57, 

   A. 

Page 73,

   2. B

   3. C

   4. A