Motion, Forces, and Simple Machines Unit

Week 36Directions1.Prepare your desk for science.• Science notebook

2.Use voice level 0 (no voice) to read through your written analysis and conclusion on notebook pg. 89.

Written Analysis & Conclusion

Written Analysis: How did using the different materials affect the angle at which the objects moved? What are your results from the experiment?

Conclusion: Was your hypothesis correct or incorrect? Why? Use background research, scientific information/vocabulary, and your own observations to support your thinking.

Reflection Questions

• What did you learn about friction? What is the effect of friction on the motion of objects?– What surfaces caused the most friction?– Did friction keep objects from starting to move?

• Other than friction, were there other forces acting upon the car and eraser?

Targets & Warm Up

Targets:•Students will identify noncontact forces that affect motion.•Students will demonstrate and describe the way things move and change motion.

Warm Up: None

Table of Contents

Date Title Page6-1-15 Noncontact Forces:

Gravity90

Once you are finished with the Table of Contents, go to page 90 and add the title and date to the top of the page.

Force

Force• Any push or pull that can make an object

move or make a moving object move faster, slow down, stop, or change direction

Noncontact Forces

Noncontact forcesForces that do not touch an object to affect it

Noncontact Forces: Gravity

Gravity• A force of attraction between two or more

objects over a distance• Makes objects pull towards each other

Newton’s Law of Universal Gravitation • Isaac Newton was the first one to

suggest that gravity is universal and affects all objects in the universe.

• The force that causes an apple to fall from a tree to the ground is the same force that causes the moon to keep moving around Earth.

• While Earth exerts a pull on you, you exert a pull on Earth. There is gravity between you and every mass around you—your desk, your book, your pen.

Noncontact Forces: Gravity

• The force of gravity between objects depends on:– Their masses– The distance between them

Noncontact Forces: Gravity

• Mass: The force of gravity if stronger if the object has a greater mass

Noncontact Forces: Gravity

• Distance: The force of gravity is stronger if objects are closer together

Mass vs. WeightNewton (N) = unit of force

1 N = the force you need to lift a small apple

BrainPop Video: Gravity

https://www.brainpop.com/science/motionsforcesandtime/gravity/

(3 minutes)

Your Task

• Use a noncontact force (gravity) to make the ball move

• Use a noncontact force (gravity) to make the ball…–Change speed–Change direction–Stop

Reflection Questions

How can gravity make a ball:• Change speed?• Change direction?• Stop?

Skip 3 lines in between each one

Targets (Revisited)

• Students will identify noncontact forces that affect motion.

• Students will demonstrate and describe the way things move and change motion.

Homework

Subject Homework Due DateScience Fix notebook pg. 89

QuizTuesday

Wednesday

Start bringing home your science notebook to study!