Forces and Motion

1. Knowing an object's position requires which of the following?

• speed
• time
• displacement
• reference point

2. Two people are pulling on a chain in opposite directions with forces of 500N an 600N. The forces would be best described as _________.

• balanced forces
• unbalanced forces
• action-reaction forces
• gravitational forces

3. If someone is walking on a moving bus, name two reasonable reference points you might use to describe his or her motion. (You do NOT need complete sentences - just list two reference points!)

4. You push a crate with a force of 10N to the right, and your friend pushes on the crate with a force of 25N to the left. Describe and explain the motion of the crate. 2 pt - describe motion 2 pt - explain why this is the motion 1 pt - complete sentences with proper mechanics

5. During a game of bowling, which of the following describe the ball's motion? (Choose 3)

• The ball is accelerated while it is pushed by the student's hand due to an unbalanced force.
• The ball slows down as it rolls because friction exerts an unbalanced force.
• The ball is accelerated while it is held in the student's hand due to balanced forces.
• The ball does not change its motion as it rolls because of the balanced force provided by friction.
• The ball does not change its motion while it is held in the student's hand due to balanced forces.

6. A test booklet is sitting at rest on a desk. Compared to the force of the booklet on the desk, the force of the desk on the booklet is the same.

• True
• False

7. The ________ can change when describing motion. It is just the chosen starting point.

• displacement
• distance
• reference point
• speed

8. When two objects interact through the gravitational force between them, the more massive one has a lower _________ than the less massive object.

• acceleration
• gravity
• distance
• force

9. Use the image shown below to answer the question. What is shown two blocks west of the park?

• two trees
• a house
• a school
• nothing

10. The acceleration of an object is always in the direction of the net force acting on it.

• True
• False