1. Question #1 Answer: unbalanced
If an object speeds up, slows down or changes direction, what type of forces must be acting on it?
Answer:
unbalanced

2. Question #2
What is the net force for the arrows shown below? Is this an example of balanced or unbalanced forces?
Answer:
Net force = 0
Balanced forces

3. Question #3
What is the net force for the arrows shown below? Is this an example of balanced or unbalanced forces?
Answer:
3 N

4. What are the two types of motion possible with balanced forces?
Question #4
What are the two types of motion possible with balanced forces?
Answer:
Not moving or
Moving at a constant speed in a straight line.
(200 points)

5. Question #5 Which planet has the strongest force of gravity and why?
Answers:
Jupiter – greatest mass

6. Question #6 Match the example with the Law of Motion: Answers:
A person pushes back with their feet to walk forward.
A hockey puck keeps sliding across the ice until it runs into the wall at the far side of the rink.
A bowling ball requires more force to accelerate than a tennis ball.
Answers:
A: 3rd law B: 1st law C: 2nd law

7. gravity and air resistance
Question #7
Which two forces are balanced when a falling object reaches terminal velocity?
Answer:
gravity and air resistance

8. They will hit the ground at the same time
Question #8
If you drop an elephant and a mouse from the same height, which will hit the ground first? (assume no air resistance)
Answer:
They will hit the ground at the same time

9. Question #9
Which type of friction is best illustrated by each of the following? A. B. C.
Answer:
skateboard: rolling slide: sliding
boat: fluid friction

10. Question #10 Fill in the blanks in the definitions below:
Mass is amount of in an object.
Weight is the force of acting on an object’s .
Answer:
Mass: amount of atoms/matter in an object.
Weight: force of gravity acting on an object’s mass.

11. Question #11
Which phases of the moon would be visible at positions 1 and 5 on the diagram below? 5 1.
Answers:
1. new moon
5. full moon

12. A – spring; B – summer; C – fall; D - winter
Question #12
Match each position on the diagram with the season that begins on that date: A. B. D. C.
Answers:
A – spring; B – summer; C – fall; D - winter