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In this lesson, we will learn how to apply Newton's third law of motion to calculate the forces acting on pairs of mutually attracting or repelling objects.

Q1:

A 1 1 0 0 . 0 -kg artillery shell is fired from a battleship, and the shell is accelerated at 2 . 4 0 × 1 0 m/s^{2}?

What is the magnitude of the net external force exerted on the shell?

What is the magnitude of the force exerted on the ship by the shell’s acceleration?

Q2:

When starting a race, a 55.0-kg-mass sprinter exerts an average force of 635 N backward on the ground for 0.560 s.

What is the sprinter’s speed after the acceleration?

How far does the sprinter move during the acceleration?

Q3:

A truck collides with a car and, during the collision, the net force on each vehicle is equal to the force exerted by the other vehicle. The mass of the car is 6 . 0 0 × 1 0 2 kg and the mass of the truck is 2 . 6 3 0 × 1 0 3 kg. The magnitude of the truck’s acceleration is 8.63 m/s^{2}. Find the magnitude of the car’s acceleration.

Q4:

Which of the following is true?

Q5:

Which force causes a boat to move forward when someone rows it?

Q6:

What is Newton’s third law of motion also known as?

Q7:

A sports car of mass 550 kg collides with a truck of mass 2,200 kg, and, during the collision, the net force on each vehicle is the force exerted by the other. The magnitude of the truck’s acceleration is 10 m/s^{2}. What is the magnitude of the sports car’s acceleration?

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