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Physics 110 Ch2 by
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# Physics 110 Ch2

## Words of Day

### Ramp up

Build up confidence

Strengthen

### Chains

Put together pieces

logical connection

Vigorous spirit

Enthusiasm

## Force

### Types

Electromagnetic, Electric charge in motion

Weak forces

Strong forces

Tension forces, Muscles, Pulleys, Ideal Pulley, Has no mass and no friction, Exerts no forces on the cord that are tangent to the cord, it is not pulling in either direction along the cord, Tension is same on both sides of the pulley, The act or process of stretching something tight

Long-range forces, Do not require objects to touch, Gravity, Weight, An object near a planet or moon is the magnitude of the gravitational force exerted on it by that planet or moon

Contact force, Exists only as long as objects are touching one another, Normal forces, Equal, A contact force between two solid objects that is perpendicular to the contact surface, Each object pushes the other one away, Friction, A contact force parallel to the contact surface, Static Friction, No slipping or sliding occurs, Tires of a car parked on a hill and the road surface, Kinetic Friction, Two objects are slipping/ sliding across one another, Loose shingle slides down a roof

Internal Interaction, Both interacting objects are part of the system, When we add up all the forces acting on the system to find net force, Every internal interaction contributes two forces, An interaction pair, Always add to zero

External Interaction, Only one of the two interaction partners s exerted on the system, The other partner is exerted on an object outside the system, Does not contribute to the net force on the system

### Push or Pull

Move something away or move something toward

### Measuring Forces

SI Unit, Newton (N), 1 lb= 4.448N

A force is measured by the deformation-Change of size or shape-it produces in object

### Vector

Magnitude, Size or Extent

Direction, A line leading to a place or point

Adding Vector Graphs, Draw arrows, Use, Ruler, Protractor

## Velocity

### Vector

Magnitude, Speed at which object moves

Direction, Direction of motion

Adding Vector Graphs, Draw arrows, Use, Ruler, Protractor

Mass

## Problems

5kg water =

### 300N + 200N

Depends on direction, 500N =, 100N =

### Relationship between mass and weight

W= mg, g, the weight of an object of mass m near Earth's surface, g = 9,80 N/kg

## Newton's Laws

### Newton's first Law

Law of Inertia, An object's velocity does not change if and only if the net force acting on the object is zero (Pg 29), Inertia- resistance to changes in velocity

### Newton's Third Law

Interaction partners always have the same magnitude and are in opposite directions

Example, You push open door and the door pushes on you, Forces on two objects, Two cars collide, Each exerts a force on the other

Do not assume involvement of Law every time two forces happen to be equal and opposite, 2 children fighting over toy, They are acting on the same object

### Newton's Law of Universal Gravitation

Any two objects exert gravitiational forces on each other that are proparotional to the masses of the two objects and inversely proportional to the square of the distance between their center

Pg 40

## Equalibrium

### Forces are in balance

There is as much force upward as there is downward

As much force to the right as there is to the left