Think about what subsequently happens to the ketchup, which is initially at rest, and use newton's first law to explain why this technique is so successful.

Newton's first law of ketchup is  if the bottle of ketchup is smacked upward, the contents (the ketchup) will tend to remain in place, and it will be closer to the opening in the bottle.

If we are trying to get ketchup out of the bottle, the best way to do it is to turn the bottle upside down and give the bottle a upward smack which force the bottle rapidly upward.

Newton first law said that every object tries to continue in its state of rest or uniform motion unless an external force acted upon it (In an inertial frame of reference, an object either remains at rest or continues to move at a constant velocity, unless acted upon by a force).   Newton first law describe the relationship between a body and the forces acting upon it, and its motion in response to those forces.

Inertia explained by Sir Isaac Newton in his first law of motion (Newton law of motion). The law states that an object at rest stays at rest and an object continues its state of motion until an external force acts on it. The examples are one's body movement to the side when a car makes a sharp turn

Grade:  9

Subject:  physics

Chapter:   newton's first law

Keywords: newton's first law

The ketchup inside the bottle is take out by shaking the bottle up and down. This process of bringing out the ketchup from the bottle make use of Newton’s Law of Inertia or the Newton’s first law.

Further Explanation:

The Newton’s first law of motion or the Newton’s law of Inertia states that a body continues to be in its state of rest or motion until and unless an external force is applied on the body that forces the body to change its state.

This law states that there needs to be a force in order to change the state of a body whether it is in motion or it is at rest.

The ketchup inside the bottle always settles down towards the bottom of the bottle. Now when it is required to take out the ketchup from the bottle, we hold the bottle upside down and shake it to bring the ketchup out of the bottle.

As the bottle is turned and shaken, the ketchup bottle suddenly comes into state of motion whereas the ketchup inside the bottle still remains in its state of rest. As the bottle goes up, the ketchup slides down to the neck of the bottle as it wants to remain in its initial position.

In this manner, when the bottle is shaken several times, the ketchup comes out of the bottle slowly. This process of taking out the ketchup from the bottle is due to the Newton’s law of Inertia.

The Newton’s first law or Law of Inertia has its several other applications in day to day life.

• The passenger tend to fall forward in a moving bus when the driver slams the brake suddenly. It happens because due to brakes, the bus comes to rest suddenly but the passenger’s body still remains in its state of motion and therefore, it tends to fall forward.

• The dust particles come out from a mattress when it is beaten up by a stick. The beating up the mattress sets up the mattress into motion but the dust particles remain in their state of rest and therefore, they fall out of the mattress.

Thus, the technique of bringing out the ketchup from the bottle by shaking it is an application of the Newton’s first law or the Newton’s Law of Inertia.

Learn More:

1.  A 400N force acting on a refrigerator of mass 200kg

2.  A toy train rolls around a horizontal 1.0m diameter track

3. A 700kg car driving at 29m/s hits a brick wall

Answer Details:

Grade: High school

Subject: Physics

Chapter: Newton’s Laws of Motion

Keywords:

Ketchup, bottle, inertia, law of motion, first law, Newton’s law, Law of inertia, upside down, bring out ketchup, motion, rest, state, passenger fall forward, shake.

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