What are Newton's 1st, 2nd, and 3rd law of motion?
* In the first law, an object will not change its motion unless a force acts on it.
* In the second law, the force on an object is equal to its mass times its acceleration.
* In the third law, when two objects interact, they apply forces to each other of equal magnitude and opposite direction.
1 point
1
1 point
1
Question 2
2.
What is your favorite law of motion and why?
Sentence Starter:
My favorite law of motion is... The reason why this is my favorite law is because...
Remembering the third law:
For every action there is an equal and opposite reaction.
In the first picture, do you see the runner’s back foot pushing backward on the track (action)? The track interacts by pushing on the runner’s foot, propelling him forward (reaction). In the
second picture, the ball forces the bat in one direction (action), and the bat forces the ball in the opposite direction (reaction). The force of the ball can sometimes break a bat!
1 point
1
1 point
1
Question 4
4.
What is the action force and reaction force in this gif?
Sentence Starter: The action force is.. The reaction force is..
1 point
1
Question 5
5.
What is the action force and reaction force in this gif?
Sentence Starter: The action force is.. The reaction force is..
1 point
1
Question 6
6.
What is the action force and reaction force in this gif?
Sentence Starter: The action force is.. The reaction force is..
6 points
6
6 points
6
Mass matters! The biggest misunderstanding about Newton’s third law is the incorrect assumption that equal and opposite forces result in equal motion. Objects do exert the same amount of force in action-reaction pairs, but the final effect of the forces depends on the mass of the objects.
1 point
1
1 point
1
Question 10
10.
What is the biggest misconception to the Third law of motion?
The Major Misconception of Newton's Third Law is that Equal and opposite forces do not result in the same motion.
For example, your foot exerts an action force on a kicked soccer ball, while at the same time, the ball exerts an equal and opposite reaction on your foot. You stay put, but the ball flies off. Why? You have much more mass than the ball, so the ball accelerates. The same force that sent the ball into the air is not enough to accelerate your massive body (Newton’s second law; F=ma).
1 point
1
3 points
3
Question 12
12.
How is the soccer ball being kicked an example of the Misconception of Third Law of Motion?
<Select all that apply>
* Hint: Remember the misconception is that although the forces are opposite and equal, this will not result in the same motion.
Action-reaction force pairs are NOT cause-and-effect
interactions. Naming which force is the action or reaction is arbitrary (done without much thought), because the interaction happens at the same time. One force does not come first, nor does the other force follow. The action-reaction name is really a misnomer, because both forces are part of a single interaction. A single event takes place in which force pairs happen at the same time, have equal size, and are in the opposite direction. Either force can be labeled as the action force or the reaction force.
1 point
1
1 point
1
1 point
1
Question 15
15.
According to the third law the action and reaction forces are always equal but in opposite directions, drag and drop the following to show your understand of the concept.
A chair is moved with a force of 300N to the left. The chair applies a force to the persons hand ______________________.
A car hit a tree with a force of ____________________ . The tree applies a force of 10,000N backwards relative to the direction that the car was heading.
A snowball is thrown at a window with a force of 2000N upwards. The window applies a force of ____________________ .
Other Answer Choices:
2000N downwards
10,000N forward
300N to the right
300N to the left
10,000N sideways
1 point
1
Question 16
16.
During the summertime in Texas, mosquitos swarm. Cars driving on the highways get covered in bugs. Which of the two forces is greater, the force on the mosquitoes or the force on the cars?
1 point
1
Question 17
17.
A large truck and a small car collide and experience the same force. The car is thrust farther from the crash than the truck and sustains more damage. What might explain this outcome?