Question

which of the following is a real - world example of newtons first law (inertia)?
the recoil of a gun after it is fired.
a person lurching forward when a car stops suddenly.
a car accelerating as the driver presses the gas pedal.
a rocket launching into space.

Explanation:

Newton's First Law states that an object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force. When a car stops suddenly, a person inside lurches forward because the person's body was in motion with the car and wants to continue moving forward due to inertia. The recoil of a gun is an example of Newton's Third Law (action - reaction). A car accelerating is an example of Newton's Second Law (force = mass x acceleration). A rocket launching is due to Newton's Third Law (thrust).

Answer:

B. A person lurching forward when a car stops suddenly.