# Force

Force is the push or pull of an object resulting in a change from rest or motion. So when you apply force to an object the velocity changes, the change in velocity is acceleration. Force is a vector quantity having magnitude and direction, some of these include acceleration, displacement, drag, lift, momentum, thrust, torque, velocity, and weight.

(Eq. 1) \(\large{ F = ma }\) (Eq. 2) \(\large{ F = p A }\) (Eq. 3) \(\large{ F = \frac {P}{v} }\) (Eq. 4) \(\large{ F = \frac {P t}{d} }\) Where: \(\large{ F }\) = force \(\large{ a }\) = acceleration \(\large{ A }\) = area \(\large{ d }\) = displacement \(\large{ m }\) = mass \(\large{ P }\) = power \(\large{ p }\) = pressure \(\large{ t }\) = time \(\large{ v }\) = velocity |

Solve for:

\(\large{ d = \frac {P t}{F} }\)

(Eq. 1) \(\large{ P = F v }\)

(Eq. 2) \(\large{ P = \frac {F d}{t} }\)

\(\large{ t = \frac {F d}{P} }\)

\(\large{ v = \frac {P}{F} }\)

## Force Types

All forces can be divided into two basic types of forces:

- Contact force
- Air resistance force
- Applied force
- Friction force
- Normal force
- Spring force
- Tension force

- Non-contact force
- Gravity force
- Electric force
- Magnetic force

### Air Resistance Force

Air resistance force ( \(F_{ar}\) ) is the force in opposition to a moving object through the air.

### Applied Force

Applied force ( \(F_a\) ) can come from different types of forces, one of them could be Newton's Second Law. There really is no one formula.

### Centrifugal force

Centrifugal force is when a force pushes away from the center of a circle, but this does not really exist. When an object travels in a circle, the object always wants to go straight, but the centripetal force keeps the object traveling along an axis of rotation.

### Centripetal force

The direction of the centripetal force is always toward the center of the circle and perpendicular to the velocity. Any combination of forces causing a uniform circular motion can be called centripetal force.

### Collinear Force

Collinear forces all share the same line of action.

### Concurrent Force

Concurrent forces are all acting at the same point.

### Coplannar Parallel Force

Coplannar parallel forces can be in the same or opposite direction and are on the same plane.

### Electric Force

An electric force ( \(F_e\) ) is an attraction or repulsion force between any two charged objects.

### Friction Force

Friction force ( \(F_f\) ) is the force an object exerts on the surface of an object as it slides across.

### Gravity Force

Gravity force is the force exerted between two masses.

### Magnetic Force

A magnetic force ( \(F_m\) ) is an attraction or repulsion force between electrically charged particles moving in a magnetic field.

### Non Coplannar Force

All non coplannar forces lines of action lie on different planes.

### Non Coplannar Concurrent Force

All non coplannar concurrent forces act at the same point but their lines of action lie on different planes.

### Non Coplannar Non Concurrent Force

All non coplannar non concurrent forces do not meet and their lines do not lie on the same plane.

### Normal Force

Normal force ( \(F_n\) ) is the supported force between two contacting objects.

### Spring Force

Spring force ( \(F_s\) ) is the force that compresses (a repulsive force) or stretches (an attractive force) the spring.

### Tension Force

Tension force ( \(F_t\) ) is the force that is exerted through a rope, string or wire when pulled from opposite directions.

Tags: Equations for Force