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Newton's Laws Answer Sheet
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Newton's Laws Answer Sheet
Choose the best answer for each multiple-choice question. For written questions, explain your thinking using complete sentences and scientific ideas.
Choose the Best Answer
1.A bus starts moving forward from a stop. A standing passenger seems to tip backward. Which law best explains this effect?
- Newton’s First Law: objects resist changes in motion
- Newton’s Second Law: force depends on mass and acceleration
- Newton’s Third Law: forces come in equal and opposite pairs
- The law of conservation of energy
2.A constant-mass cart is pushed with a greater net force. What happens to its acceleration?
- It increases
- It decreases
- It remains unchanged
- It becomes zero
3.Which situation best demonstrates Newton’s Third Law?
- A dropped apple speeds up as it falls
- A loaded wagon takes more force to speed up than an empty wagon
- A swimmer pushes water backward and moves forward
- A lamp stays still on a desk
Explain the Laws
4.State Newton’s First Law in your own words. Include what can change an object’s motion.
5.Write Newton’s Second Law as an equation. Explain what each letter means and give the usual units for force, mass, and acceleration.
6.Describe one example of an action–reaction pair. Identify both forces and explain why they do not cancel each other out.
7.Two carts must reach the same acceleration. One cart has a greater mass than the other. Which cart needs the greater net force, and why?
Apply Your Understanding
8.A car brakes suddenly at a traffic light. Explain why a properly fastened seat belt helps protect a passenger, using Newton’s First Law.
9.A rocket expels hot gas backward while travelling through space. Explain how it can move forward even though there is no air to push against.
10.Why is it generally easier to make an empty grocery cart speed up than a cart loaded with groceries if you push each with the same force?
3 printable pages
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