Describe a scenario where an object is in motion but eventually comes to a stop. Explain what forces are acting on the object to cause it to stop, relating your answer to Newton's First Law.

A ball rolling on the ground will eventually stop due to forces like friction and air resistance. These unbalanced forces act against the motion of the ball, causing it to slow down and stop, which is why it doesn't continue moving indefinitely as Newton's First Law suggests it would in the absence of such forces.

Imagine you are in a spaceship far from any stars or planets. You throw a ball. What does Newton's First Law predict will happen to the ball?

Newton's First Law predicts that the ball will continue moving in a straight line at a constant speed forever, since there are no significant external forces (like gravity or air resistance) to act upon it.

Why is it more difficult to start pushing a heavy box from rest than to keep it moving once it's already sliding?

It is more difficult to start pushing a heavy box from rest because you must overcome its inertia, the tendency to resist changes in its state of motion. Once the box is moving, you only need to apply enough force to overcome friction and maintain its constant velocity, as described by Newton's First Law.

Newton's First Law Of Motion Lesson Plan for 7th Grade

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Objective

I can explain how Newton's First Law applies to objects at rest and in motion.

Part 1 of 4

Warm-up video

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We don't generate video — this one is by Khan Academy on YouTube. The practice questions and exit ticket below were drafted by AI for this objective, and every question is editable in the teacher guide.

Part 2 of 4

Key concepts

3 concepts

1
Newton's First Law states that an object will stay at rest or move with a constant velocity unless acted upon by an unbalanced force.
2
An unbalanced force is required to change an object's state of motion; if forces are balanced, the object's motion remains unchanged.
3
In real-world scenarios, objects in motion tend to stop due to unbalanced forces like friction and air resistance, which counteract the motion.

Part 3 of 4

Practice

5 questions

According to Newton's First Law, what will an object at rest do?

Explain, in your own words, what is meant by the term 'inertia' and how it relates to Newton's First Law.

Part 4 of 4

Exit ticket

Quick comprehension check

“Explain how Newton's First Law applies to a soccer ball sitting on the ground and a hockey puck sliding across the ice.”

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Newton's First Law of Motion

Objective

Warm-up video

Key concepts

Practice

Exit ticket

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