Understanding Newton's Laws of Motion

In this video, Martín and his father discuss why a shopping cart might not move when pushed. Martín recalls learning about Newton's third law in physics class, which states that every action has an equal and opposite reaction. He wonders if this means the cart won't move. Isaac steps in to clarify that while the forces are equal and opposite, they act on different bodies, and only external forces cause movement. With this understanding, Martín realizes the cart will move when pushed, and they continue shopping.

What does Martín's father ask him to do at the beginning of the video?

• To get the shopping cart

• To help with the groceries

• To explain Newton's laws

• To call Isaac

What concept did Martín learn in his physics class?

• First law of Newton

• Third law of Newton

• Law of gravity

• Second law of Newton

According to Martín, what will happen when he tries to push the cart?

• The cart will move forward

• The cart will fall over

• The cart will push back with equal force

• The cart will not move

Who appears to help Martín and his father understand the laws of physics?

• Isaac

• Professor Doroty

• Isaac Newton

• Albert Einstein

What does the third law of Newton state?

• For every action, there is an equal and opposite reaction

• An object in motion stays in motion

• Force equals mass times acceleration

• Energy cannot be created or destroyed

According to Isaac, on which bodies do the action and reaction forces act?

• On the body at rest

• On the body in motion

• On different bodies

• On the same body

What does the second law of Newton state?

• For every action, there is an equal and opposite reaction

• An object in motion stays in motion

• Force equals mass times acceleration

• Energy cannot be created or destroyed

What is the only external force acting on the cart according to Isaac?

• Air resistance

• The force exerted by Martín

• Friction

• Gravity

What does Martín realize after Isaac's explanation?

• That he should consider only external forces

• That the cart will never move

• That Newton's laws are incorrect

• That he needs to push harder

What do Martín and his father decide to do at the end of the video?

• Continue with their shopping

• Revisit the physics class

• Call Professor Doroty

• Watch another video