Uniformly Accelerated Linear Motion Model: Force 2

Physics 1: Section 3.3

What is Newtons third law of motion state?

When a system interacts with a surrounding, each exerts a force on the other, such as that the two forces have equal magnitude and opposite directions

What is something that has no exceptions in Newtons 3rd law?

The two forces are equal in magnitude

What are the interactions to be stated as in Newton’s 3rd law?

Object A applies a force on object B

Object B applies a force on object A

These two forces are equal in magnitude

These two forces are opposite in direction

They do NOT cancel

Newtons 1st/2nd law vs Newtons 3rd law

1st and 2nd laws deal with the forces acting on a system by its surroundings. 3rd law deals with two forces involved in a single interaction between the system and one surrounding

A chandelier hangs from a chain. Which of the following describes why the chandelier is a rest?

Earth pulls downward on the chandelier

The chandelier has no net force acting on it

The chain pulls upward on the chandelier

A bicycle is accelerating in the opposite direction of its velocity. Which of the following describes the bicycles motion?

The bicycle is slowing down

The net force on the bicycle is in the opposite direction of the velocity

A student pushes a box with a constant horizontal force, and the box moves with constant velocity. Which of the following statements are correct?

The net force on the box is zero → Newtons 1st law

The students’ force on the box is balanced by the kinetic friction force exerted by the floor → Newtons 1st law

The box exerts a force on the student equal in magnitude and opposite in directions to the students push on the box → Newtons 3rd law

What does Newtons 3rd law interactions involve?

Two forces on two objects, equal in magnitude an direction