Forces and Motion

Week 3 Thursday, August 22

Classwork

• Bell work #4
• Finish and discuss distance and displacement ws
• Position and motion school to home
• Running Wolf Distance and Displacement

​

​

​

Bell Work #4

1. The rate of change of position in which the same distance is traveled each second is known as _________________.

• Total distance divided by total time is _________________.
• Speed at a specific instant in time is ____________________________.

​

4. The total length of a path an object follows is ____________.

​

• How many centimeters are in 8 kilometers?

​

constant speed

average speed

​

instantaneous speed

​

distance

​

(100 cm/1 m) x (1000 m/ 1 km) x 8 km = 800,000 cm

​

Position and Motion

Topic 4 Lesson 1

​

Lesson Outline

5

A. Describing Position

1. A(n) ______ ______ is a starting point you choose to describe the location, or position, of an object.
2. A(n) _________ is an object’s distance in a certain direction from a reference point.
3. A complete description of a position includes a distance, a(n) __________, and a reference point.
4. A good choice for a(n) _____________is something that is easy to find.
5. If a reference point changes, the description of an object’s ________ will also change.
6. Changing a reference point does not change the actual ______ of an object.
7. When you describe an object’s position, you compare its location to a reference _________.
8. A reference direction can be described as a(n) _______ direction. The opposite direction is the ________________ direction.

​

Reference point

position

direction

reference point

position

position

direction

positive

negative

B. Describing Position in Two Dimensions

1. When you describe position using two directions, you are using two _________.

​

2. Examples of _________ directions in two dimensions include “north and east” and “right and forward”.

​

3. To find a position in two dimensions, first choose a reference ______. Next specify reference ___________. Then determine the _________ along each reference direction.

dimensions

reference

point

directions

distance

C. Describing Changes in Position

1. ______ is the process of changing position. It is always described relative to a(n) _________ _____.
2. It is possible to move with regard to one __________ _____ and stay motionless with regard to another __________ ______.
3. ________ is the length of the path an object moves along.
4. ____________ is the difference between the initial position and the final position of an object.
5. Distance and displacement are equal only if the motion is in one _________.

Motion

reference point

reference point

reference point

Distance

Displacement

direction

Running Wolf

With direction

17 units

3 units East

27 units

1 unit south

Running Wolf

Running wolf worksheet

12

Homework

​

• Do 1-5 on the back of the displacement/distance sheet (next slide)

Study Test on Distance and Displacement Wednesday, 8/28

Distance and Displacement Practice WS

14