Chapter 9 - Motion - Motion and Point of Reference HW

Name ______________________________

Chapter 9 – Reference Points, Distance and Displacement

Use pages 338 - 341.

1. How do you know if an object is moving?

2. Suppose you are riding in a car. Describe your motion relative to the car, the road, and the Sun.

3. How are distance and displacement similar? How are they different?

4. Suppose you moved 8 meters forward and then 3 meters backward. What is your displacement from your original position?

5. An object moves 3 cm to the right, then 6 cm to the left, then 8 cm to the right. What is the object’s final displacement from the origin?

Name __________________________________

Pages 424 – 429 in the textbook

Buoyancy Homework

1. On April 15, 1912 the Titanic sank on its maiden voyage when an iceberg ripped a hole in the side of the ship filling five of the interior compartments with water. Use buoyant force to explain how the Titanic floated in water but then sank as it filled with water.

2. An object that weighs 340 Newtons floats on a lake. What is the weight of the displaced water? What is the buoyant force?

3. Look at the cartoon to the right. Use buoyant force to explain why the duck is floating lower in the water than the other ducks.

***Find the cartoon on the bottom of the "notes" handout that I gave you in class today. It shows four ducks and one is floating deeper in the water than the other ducks.

Study Guide - Chapter 1 test

Study Guide – 8^th Grade Physical Science

Chapter 1 Test

To prepare for this test you will need to use your notes, labs, homework, and class work as well as your textbook.

Scientific Inquiry (pages 6-15)

1. Know what an inference is. Be prepared to make inferences about a picture similar to the class and homework examples.

2. Know what a hypothesis is.

3. What are parameters in a scientific investigation?

4. Know the definitions for manipulated and responding variable and be able to identify each in a given example.

5. What is a controlled experiment? Why is it important for experiments to be controlled?

6. What is a scientific theory? Know how theories and hypotheses are different.

Measurement and Equipment (pages 16 – 26)

1. What is length? What units do we use to measure length in science?

2. What is weight?

3. What is mass? What units do we use to measure mass?

4. How are weight and mass different?

5. What happens to weight as gravity increases or decreases?

6. What is volume? What units do we use to measure volume?

7. What is density? What are the units for density? What is the formula used to measure density?

8. Be ready to compare the relative densities of common objects discussed in class.

9. Know graduated cylinder, beaker, balance, ruler, and Erlenmeyer flask.

Graphing in Science (pages 34 – 41)

1. Know how to identify manipulated and responding variables in an experiment.

2. Know how to take the data from a data table and graph the data putting the manipulated data on the horizontal axis and the responding variable on the vertical axis. Label each axis.

3. Know how to read a line graph.

Homework 9/6 - You Need to Draw Your Own Graph

Name __________________________________

Date _______

Homework – Graphing Manipulated and Responding Variable

and Measurement Vocabulary

1. Use the data table below to draw a graph. Make sure to define each axis. The manipulated variable goes on the x-axis (horizontal) and the responding variable goes on the y-axis (vertical).

Volume of Water	500 mL	1,000 mL	1,500 mL	2,000 mL
Boiling Time (Minutes)	3 minutes	18 minutes	21 minutes	34 minutes

Use pages 18 – 26 to define the following key terms.

A. Length- (Give units too.)

B. Weight – (give units)

C. Mass – (give units)

D. Volume – (give units)

E. Density –