Newton's Laws in Everyday Scenarios

Which of Newton's laws explains why passengers in a car tend to move forward when the car suddenly stops?

• Newton's First Law

• Newton's Second Law

• Newton's Third Law

Answer explanation

Newton's First Law states that an object in motion stays in motion unless acted upon by an external force. When a car stops suddenly, passengers continue moving forward due to inertia, illustrating this law.

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DOK Level 1: Recall

A book is lying on a table. Which of Newton's laws explains why the book remains at rest?

• Newton's First Law

• Newton's Second Law

• Newton's Third Law

Answer explanation

Newton's First Law states that an object at rest stays at rest unless acted upon by an external force. The book remains at rest on the table because no unbalanced forces are acting on it.

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DOK Level 1: Recall

A rocket launches into space by expelling gas downwards. Which of Newton's laws is demonstrated by this action?

• Newton's First Law

• Newton's Second Law

• Newton's Third Law

Answer explanation

The rocket's action of expelling gas downwards demonstrates Newton's Third Law, which states that for every action, there is an equal and opposite reaction. The downward force of the gas propels the rocket upward.

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DOK Level 1: Recall

If a force of 10 N is applied to a 2 kg object, what is the acceleration of the object according to Newton's Second Law?

• 2 m/s²

• 5 m/s²

• 10 m/s²

Answer explanation

According to Newton's Second Law, F = ma. Here, F = 10 N and m = 2 kg. Rearranging gives a = F/m = 10 N / 2 kg = 5 m/s². Thus, the correct answer is 5 m/s².

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DOK Level 2: Skill/Concept

Which of Newton's laws is used to explain why a ball thrown in space will continue moving in a straight line at constant speed?

• Newton's First Law

• Newton's Second Law

• Newton's Third Law

Answer explanation

Newton's First Law states that an object in motion stays in motion at a constant velocity unless acted upon by an external force. In space, with minimal forces, a thrown ball continues moving in a straight line at constant speed.

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DOK Level 1: Recall

A car accelerates from rest to 60 m/s in 10 seconds. Which of Newton's laws is primarily involved in this scenario?

• Newton's First Law

• Newton's Second Law

• Newton's Third Law

Answer explanation

Newton's Second Law states that force equals mass times acceleration (F=ma). In this scenario, the car accelerates from rest to 60 m/s, demonstrating the relationship between force, mass, and acceleration.

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DOK Level 1: Recall

Calculate the force required to accelerate a 5 kg object at 3 m/s².

• 8 N

• 15 N

• 20 N

Answer explanation

To find the force, use Newton's second law: F = m * a. Here, m = 5 kg and a = 3 m/s². Thus, F = 5 kg * 3 m/s² = 15 N. Therefore, the correct answer is 15 N.

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DOK Level 2: Skill/Concept

Which of Newton's laws explains the interaction between a hammer and a nail when the hammer hits the nail?

• Newton's First Law

• Newton's Second Law

• Newton's Third Law

Answer explanation

Newton's Third Law states that for every action, there is an equal and opposite reaction. When the hammer strikes the nail, the hammer exerts a force on the nail, and the nail exerts an equal force back on the hammer.

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DOK Level 1: Recall

A 10 kg object is subjected to a net force of 50 N. What is the acceleration of the object?

• 2 m/s²

• 5 m/s²

• 10 m/s²

Answer explanation

Using Newton's second law, F = ma, we can find acceleration (a) by rearranging the formula to a = F/m. Here, a = 50 N / 10 kg = 5 m/s². Thus, the correct answer is 5 m/s².

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DOK Level 2: Skill/Concept

Which of Newton's laws is demonstrated when a person pushes against a wall and the wall pushes back with equal force?

• Newton's First Law

• Newton's Second Law

• Newton's Third Law

Answer explanation

Newton's Third Law states that for every action, there is an equal and opposite reaction. When a person pushes against a wall, the wall exerts an equal force back, demonstrating this law.

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DOK Level 1: Recall