Slide 1 / 45 New Jersey Center for Teaching and Learning Progressive Science Initiative This material is made freely available at www.njctl.org and is intended for the non-commercial use of students and teachers. These materials may not be used for any commercial purpose without the written permission of the owners. NJCTL maintains its website for the convenience of teachers who wish to make their work available to other teachers, participate in a virtual professional learning community, and/or provide access to course materials to parents, students and others. Click to go to website: www.njctl.org Slide 2 / 45 Forces & Interactions Classwork and Homework www.njctl.org Slide 3 / 45 Classwork #1: Forces and Motion
Slide 4 / 45 1 The chalkboard is 10 steps away, and the bathroom is 15 steps away. Which one is the greater distance away from you? A chalkboard B bathroon Slide 5 / 45 2 In a race, it took 17 seconds for Jill to reach the finish line while it only took Jane 15 seconds. Who finished the race in the least amount of time? A Jill B Jane Slide 6 / 45 3 Circle the correct terms. Two blocks move in a straight line for 5 seconds. A The block with a greater speed can travel a (shorter/greater) distance in that time. B The block with a smaller speed can travel a (shorter/greater) distance in that time.
Slide 7 / 45 4 The formula for speed is __________ ÷ __________. Slide 8 / 45 5 Applying a force to an object that is moving changes its motion. True False Slide 9 / 45 6 Circle the correct term - Friction applies a force (with / against) an object’s motion. A with B against
Slide 10 / 45 Homework: Forces and Motion Slide 11 / 45 7 What is distance? Slide 12 / 45 8 What is time?
Slide 13 / 45 9 What is speed? Slide 14 / 45 10 An object moves 12 meters in 3 seconds. What is its speed? Slide 15 / 45 11 What is force?
Slide 16 / 45 12 What is friction? Slide 17 / 45 Classwork #2: Balanced and Unbalanced Forces Slide 18 / 45 13 What is the net force applied to the box below? What direction is the net force?
Slide 19 / 45 14 What is an example of a balanced force? Slide 20 / 45 15 What is an example of an unbalanced force? Slide 21 / 45 16 If a force causes an object to speed up, is there a balanced or an unbalanced force on it? A balance force B unbalanced force
Slide 22 / 45 Homework: Balanced and Unbalanced Forces Slide 23 / 45 17 A 5 N force is applied to a box, moving it to the right. A 3 N force is applied in an attempt to move the box to the left. Draw a diagram (like in classwork problem 1) that represents this. Which way does the box move, and what is the net force? Slide 24 / 45 18 If the net force on an object is 0 N, is there a balanced or unbalanced force being applied to it? A balanced force B unbalanced force
Slide 25 / 45 19 Circle whether each example below is a balanced or unbalanced force. A (Balanced / Unbalanced) - Two kids push on a ball, resulting in a net force of 2 Newtons to the left B (Balanced / Unbalanced) – A book sits still on a table C (Balanced / Unbalanced) – You hold a bottle of water above your head and it does not move D (Balanced / Unbalanced) – You swing a baseball bat, and it hits a baseball, causing it to fly into the field E (Balanced / Unbalanced) – You throw your blanket off of you to get out of bed Slide 26 / 45 Classwork #3: Motion Prediction from Patterns Slide 27 / 45 20 Science is not used to make predictions. True False
Slide 28 / 45 21 Predict the motion of a swing. Slide 29 / 45 22 Predict the motion of two children on a seesaw. Slide 30 / 45 Homework: Motion Prediction from Patterns
Slide 31 / 45 23 Draw a diagram of a pendulum. Also, draw its motion path. Slide 32 / 45 24 Fans, roller coasters, and other objects have a predictable motion path. What is something (that has not been discussed yet) that has a predictable motion path? What is its motion path? Slide 33 / 45 Classwork #4: Non Contact Forces
Slide 34 / 45 25 Objects can apply forces on each other without touching. True False Slide 35 / 45 26 The three examples of non contact forces are ______________, ______________, and ______________. Slide 36 / 45 27 What is an example of gravitational force?
Slide 37 / 45 28 Draw the magnetic field of this magnet. Slide 38 / 45 29 A tiny iron ball is attracted to a bar of metal. This is an example of a ______________ force. Slide 39 / 45 30 A positive change and a negative charge (attract / repel) each other. A attract B repel
Slide 40 / 45 Homework: Non Contact Forces Slide 41 / 45 31 Define gravitational force. Slide 42 / 45 32 Define magnetic force.
Slide 43 / 45 33 How do compasses work? Slide 44 / 45 34 Define electrical force. Slide 45 / 45 35 Label each force as gravitational, magnetic, or electrical A __________ A balloon becomes attracted to a wall after rubbing it. B __________ A dropped plate falls towards the ground. C __________ As you try to throw some plastic wrap into the garbage, it keeps sticking to your hand. D __________ A magnet sticks to your refrigerator. E __________ You stay on the ground instead of flying off of the surface of Earth.
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