# Newton's First, Second & Third Laws Flashcards

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Acceleration is directly proportional to net force

Acceleration is inversely proportional to mass

The force acting on an object is equal to the object's mass multiplied by its acceleration

*F* = *ma*

20 N to the left

Contact forces: normal force, friction, air resistance, applied force, tension, spring force

Non-contact forces: gravity, electric force, magnetic force

The forces are balanced in the x direction and unbalanced in the y direction

A vector diagram used to show all the forces acting on an object

Occurs when all paired forces (such as the force pushing up and the force pulling down) acting on an object are equal (ΣF = 0)

The object is either at rest or moving at a constant velocity

An object at rest stays at rest and an object in motion stays in motion at the same velocity unless an unbalanced force acts on it

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## Flashcard Content Overview

There are many daily occurrences that can be explained by one of Newton's three laws of motion. You may be pushing a heavy shopping cart and notice it requires a lot more push to move it the same speed. You may have a child and have them in a rear-facing car seat. You may see a speed limit sign that has a slower speed limit for 18-wheelers. These flashcards will help you better understand these scenarios by reviewing Newton's three laws of motion.

An object at rest stays at rest and an object in motion stays in motion at the same velocity unless an unbalanced force acts on it

Occurs when all paired forces (such as the force pushing up and the force pulling down) acting on an object are equal (ΣF = 0)

The object is either at rest or moving at a constant velocity

A vector diagram used to show all the forces acting on an object

The forces are balanced in the x direction and unbalanced in the y direction

Contact forces: normal force, friction, air resistance, applied force, tension, spring force

Non-contact forces: gravity, electric force, magnetic force

20 N to the left

The force acting on an object is equal to the object's mass multiplied by its acceleration

*F* = *ma*

Acceleration is directly proportional to net force

Acceleration is inversely proportional to mass

The maximum velocity an object will reach during free fall, due to the balance between air resistance and gravity

When reaching terminal velocity, the force of air resistance and gravity are balanced. Since there are no unbalanced forces, Newton's first law states that they will move at a constant velocity.

Lines/arrows are straight & away from the object, normal force is 90° to the surface, gravity is straight down, tension acts in both directions, friction is opposite the direction of motion

*m* = *Fg* / 9.8 m/s2 = 75 kg

*Fnet x* = 450 N - 300 N = 150 N

*F* = *ma*; *a* = 150 N / 75 kg = 2.0 m/s2

For every action force, there is an equal and opposite reaction force.

*m* = 75 kg + 25 kg = 100 kg

*Fg* = 100 kg * 9.8 m/s2 = 980 N = *Fn*

The ball exerts a force on the bat. The bat exerts an equal and opposite force on the ball.

Action-reaction force pairs are the same force in different directions

Must be equal and opposite

Occur between two different objects

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Physics 101: Intro to Physics20 chapters | 167 lessons | 11 flashcard sets

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