Here are the answers to your Newton’s Laws worksheet.
III. NEWTON’S THIRD LAW OF MOTION
13. Newton’s third law of motion is also known as the
LAW OF ACTION-REACTION.
14. Newton’s third law says that every time there is an
ACTION force, there is also a
REACTION force that is
EQUAL in size and acts in the
OPPOSITE direction.
15. Newton’s third law states that forces must ALWAYS occur in
PAIRS.
16. Listed below are ACTION forces. Tell the REACTION force:
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a. Your bottom pushing on your desk seat:
The desk seat pushing up on your bottom.
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b. A bat hitting a baseball:
The baseball hitting the bat.
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c. Your finger pressing on your phone screen while texting:
The phone screen pressing back against your finger.
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IV. UNDERSTANDING...
Image 1: Green Block being pushed (F=20N)
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Law: 2nd Law
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Explanation: This image shows a specific amount of Force ($20\text{ N}$) acting on a specific Mass ($5\text{ kg}$). Newton's Second Law explains how force, mass, and acceleration are related ($F=ma$). It describes what happens when an unbalanced force pushes an object.
Image 2: Hammer hitting a nail
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Law: 3rd Law
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Explanation: The arrows show two forces happening at once. The hammer exerts a force driving the nail into the wood, and the nail exerts an equal and opposite force back onto the hammer (which stops the hammer from moving). This is an action-reaction pair.
Image 3: Crash Test Dummies
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Law: 1st Law
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Explanation: This demonstrates inertia. When the car crashes and stops suddenly, the dummies continue moving forward because no force has acted on them yet to stop them. Objects in motion stay in motion unless acted upon by an outside force (like a seatbelt).
Image 4: Cannon firing
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Law: 3rd Law
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Explanation: This is a classic example of action and reaction. The explosion pushes the cannonball forward (action), and the cannonball pushes the cannon backward (reaction), causing the cannon to recoil or roll back.
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Final Answer:
III. Newton's Third Law
13. Action-Reaction
14. Action; Reaction; Equal; Opposite
15. Pairs
16a. The seat pushing up on you
16b. The ball hitting the bat
16c. The screen pushing back on your finger
IV. Understanding
1.
2nd Law: Shows Force acting on Mass to create acceleration ($F=ma$).
2.
3rd Law: Shows equal and opposite forces between the hammer and the nail.
3.
1st Law: Shows inertia; the bodies keep moving forward after the car stops.
4.
3rd Law: Shows the action of the ball going forward and the reaction of the cannon going backward.
Parent Tip: Review the logic above to help your child master the concept of newton laws of motion worksheet.
