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January 23, 2017 Aims:

SWBAT define and distinguish mass versus weight

Agenda

1. Do Now

2. Guided Notes

3. Independent Practice 4. Practicing our AIMS:

Homework: F.10 – Mass v Weight

How will you help our class earn all of our S.T.R.I.V.E. Points?

100% HW Club….you in?!?!

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Aim Check:

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OBJECTIVES: By the end of class, students will be able to…

SWBAT define and distinguish mass versus weight

DO NOW

Directions: Read and ANNOTATE the question before you solve the problem.

1. What causes acceleration or a change in an object’s motion?

2. In a car accident, a seat belt helps prevent injures by applying a force

A. less than the force of the moving passenger

B. greater than the force of the moving car

C. in the same direction as the car’s motion

D. in the opposite direction of the passenger’s motion.

3. What three effects can happen to the motion of an object when only one force is applied on the

object?

SCIENCE 8 Mass v Weight

F.10

Name: _____________________________

Date: ________________________________

Homeroom: _________________________

Forces

Telekinesis, wingardium leviosia, the force…ALL

SCIENCE!

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WE DO: Guided Notes

HOW TO THINK ABOUT GRAVITY

GRAVITY:

1. When you drop a rock from a cliff, which of the following happens?

A. Only the rock falls to the Earth

B. Only the Earth falls up to meet the rock

C. The rock and the Earth fall towards each other

D. None of the above

2. If you place two teenagers with equal mass in space:

A. They will fall towards each other

B. They will remain in place

C. They will move apart

D. We cannot even make an educated guess about what will happen

3. What is gravity?

A. What goes up must come down

B. Everything is attracted to everything else

C. Only small things are attracted to larger things

D. Only larger things are attracted to smaller things

4. Why do astronauts weigh less on the moon than they do on the earth?

A. It's a little known fact, but space suits generally make people weigh less.

B. The moon has less mass than the Earth. Therefore, it has a smaller gravitational pull on the

astronaut.

C. The Earth is closer to the sun.

D. Astronauts weigh the same no matter where they are.

5. What causes gravity?

A. The force of magnetism.

B. The amount of electrons in a particular object.

C. We don't know, conclusively.

D. Scientist determine the amount that objects are attracted to one another.

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MASS V WEIGHT

MASS:

WEIGHT:

WEIGHT and Newton’s 2nd Law:

o Fg is ____________________________________ , measured in _______________________

o m is ______________________, measured in _________________________

o ag is __________________________________, measured in ______________

always equal to 9.8 m/s2 on earth

Because weight ____________________________________________________________,

your weight ______________________ as you travel around Earth and the universe!

The more or less gravity you have acting on you the heavier or lighter you weigh.

That’s why we always talk about _________________ not weight when we want to

talk about how heavy an object is.

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YOU DO: Independent Practice

Directions: For each key term, explain the “big idea” to a kindergartener.

Then, draw a picture to illustrate the word.

Term Concept Picture

GRAVITY

MASS

WEIGHT

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The diagram shows the relative strengths of the gravitational force for planets of different masses. The

size of each planet represents the planet’s relative masses. The arrow length indicates the relative

amount of gravitational pull that each planet would exert on an astronaut in space.

1. What is the relationship between the mass of the planets and the relative strength of the gravitational

pull?

____________________________________________________________________________________________________

________________________________________________________________________________

2. Which three planets shown have LESS gravitational pull than Earth?

________________________________

________________________________

________________________________

3. How are the mass of a planet and its gravitational pull related?

____________________________________________________________________________________________________

________________________________________________________________________________

4. Which two factors determine the gravitational attraction between two objects?

__________________________________________________________________________________________

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A person weighs less on the moon than on the earth.

Discuss why gravity is a benefit: What would it be like if the force of gravity were stronger? What if it were

equal to that of the moon?

How are gravity and weight related?

Distance also plays a role in the force of gravity. Explain how the force changes with respect to

distance.

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Since gravity makes everything accelerate downward at 10 m/sec2, why do some objects hit the

ground before others even though they had the same mass (assuming they were dropped at the exact

same time)?

____________________________________________________________________________________________________

____________________________________________________________________________________________________

____________________________________________________

2. A car drives off a cliff into the ocean:

Label the different forces acting on it as it travels.

Draw the path the car will take as it falls into the ocean.

3. Gravity will make your car accelerate at _______ m/s2.

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Science 8

F.10:

Mass vs Weight

Name: _____________________________

Date: _______________________________

Homeroom: _________________________

Quick Notes:

SKILL SNAPSHOT

Like A Scholar?

Yes No

Redo?

Yes No

Read and ANNOTATE the information before you solve the problem.

Directions: Support your selection by finding evidence to support your answer OR evidence to

support why another is incorrect. Be sure to include at least one scientific term in your evidence

Question Supporting evidence

1. Which is an accurate description of mass?

A. The amount of matter in something

B. The amount of space an object takes up

C. The measure of the force of gravity acting on

an object

D. The distance around an object

2. Which is an accurate description of weight?

A. The amount of matter in something

B. The amount of space an object takes up

C. The measure of the force of gravity acting on

an object

D. The mass of a material in a given volume

3. Standing on Earth’s surface, how can you

increase the gravitational pull that you exert on

Earth?

A. Gain altitude

B. Gain mass

C. Move faster around earth

D. Move farther from earth

4. Which describes the direction of Earth’s

gravitational pull?

A. Away from the Earth’s center

B. Toward the stars

C. Toward the center of the Earth

D. Toward the Moon and the Sun

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5. If a hamster has a mass of 60 grams on Earth,

which choice is closest to the weight of the

hamster in space?

A. 60 Newtons

B. 10 Newtons

C. 0 Newtons

D. 120 Newtons

6. What is a difference between mass and weight?

A. They are the same thing.

B. Mass always stays the same, but weight

changes when gravity changes.

C. Weight always stays the same, but mass

changes when gravity changes.

D. Mass is measured with a ruler, but weight is

measured with a balance.

CONCEPT CHECK

7. Forces act on a block on a horizontal surface as shown in the diagram.

As a result of these forces, the block

A. moves at constant speed to the right

B. accelerates to the right

C. moves at constant speed to the left

D. accelerates to the left

Supporting evidence