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www.njctl.org

Forces & Interactions Classwork and Homework

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Classwork #1: Forces and Motion

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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

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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

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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.

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4 The formula for speed is __________ ÷ __________.

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5 Applying a force to an object that is moving changes its motion. True False

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6 Circle the correct term - Friction applies a force (with / against) an object’s motion. A with B against

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Homework: Forces and Motion

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7 What is distance?

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8 What is time?

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9 What is speed?

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10 An object moves 12 meters in 3 seconds. What is its speed?

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11 What is force?

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12 What is friction?

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Classwork #2: Balanced and Unbalanced Forces

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13 What is the net force applied to the box below? What direction is the net force?

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14 What is an example of a balanced force?

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15 What is an example of an unbalanced force?

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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

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Homework: Balanced and Unbalanced Forces

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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?

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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

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19 Circle whether each example below is a balanced

• r 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

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Classwork #3: Motion Prediction from Patterns

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20 Science is not used to make predictions. True False

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21 Predict the motion of a swing.

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22 Predict the motion of two children on a seesaw.

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Homework: Motion Prediction from Patterns

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23 Draw a diagram of a pendulum. Also, draw its motion path.

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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?

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Classwork #4: Non Contact Forces

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25 Objects can apply forces on each other without touching. True False

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26 The three examples of non contact forces are ______________, ______________, and ______________.

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27 What is an example of gravitational force?

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28 Draw the magnetic field of this magnet.

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29 A tiny iron ball is attracted to a bar of metal. This is an example of a ______________ force.

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30 A positive change and a negative charge (attract / repel) each other. A attract B repel

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Homework: Non Contact Forces

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31 Define gravitational force.

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32 Define magnetic force.

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33 How do compasses work?

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34 Define electrical force.

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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.