# Forces in balance

Displacement
distance in a certain direction
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Scaler
Physical quantites that have size but no specific direction such as distance and speed
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Vectors
Physical quantites that have a size and direction such as displacment and force
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Magnitude
Te size of a quantity is its magnitude. Vectors have a magnitude and direction but scalers only have a magnitude
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Vector quantity and arrows
Any vector quantity can be represented by an arrow. The direction of the arrow shows the direction of the vector quantity and the lenght of the arrow represents the magnitude of the vector quantity
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what is a force?
A force is a push, pull, twist or turn. Forces always comes in pairs called interaction pairs.
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What can forces make an object do
Forces can make an object (speed up), (slow down), (change shape), (change direction) and turn
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What are forces measured in?
Forces are measured in newtons (N) using a nano-metre
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Newtons third law of motion
when two obect interact with eah other they exert equal and opposite forces on each other
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equation for weight
weight = mass x gravity
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gravity
the bigger the objetc the bigger the gravity. The smaller the object the smaller the garvity
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Mass
Mass is the amount of matter in something. Mass is measured in kg
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weight
weight is a force measured in newtons
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Resultant force
Resultant force is a single force that has the same effect as all the forces acting on the object
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Newtons first law of motion
if the force acting on the object are balanced, the resultant force on thee object is 0 and if the object is stationary it remains at rest. If its moving it keeps moving with the same speed and in the same direction
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Free body diagram
a free body diagram shows the force acting on an object without sny other obect
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The centre of mass of a object
the centre of mass of an object is the point at its mass can be thoought as being concentrated
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velocity
speed in a particular idrection (m/s). Velocity has speed ans direction
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aceeleration equation 1
End velocity - starting velcity divided by time
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gradient
gradient is the speed
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equation for resultant force
resultant force (F)= Mass (M) x acceleration (A)
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Newtons second law of motion
newtons second law of motion says that the acceleration of an object is proportional to the force of the object and inversely proportional to the mass of the object
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why is an resultant force needed?
A resultant force is needed to change the velocity of the object
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Inertia
The tendency of an object to stay at rest or carry on at a steady speed
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Inertia mass
The inertia mass of an object is a measure of the difficulty of changing the objects velocity
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equation for inertial mass
inertial mass = force divided by acceleration
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how does the velocity of the object chnage
The velocity of an object change if it is acte on by an resultant force
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what happens if the resultannt force is in same direction as velocity
if the resultant force is in the same direction as the velocity the object accelerates
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what happens if the resultant force is in opposite direction of velocity
If the resultant force is in the oppoosite direction of velocity than the acceleration is negative and as a result the object slows down
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what is weight of an object
The weight of an object is the force acting on it due to gravity
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what does the gravatational force on an object depend on
The gravatational force on an object dependsmwhere on earth it is
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equation for weight
weight,W = mass,m x gravitational field sttrenght (gravity), g
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stopping distance
stopping distance is amde of two parts the thinking distance and bracking distance
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thiequation for stopping distance
stopping distance = thinking + braking
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thinking distance
thee distance a vehicle travels while you relise youneed to brake
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bracking distance
the distance you travel from the time you hit the brakes until you stop
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factors affecting stopping distance
(speed of vehicle), (tiredness, alchol, drug), (poor weather),(worn tyres and brakes)
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how to calculate braking force
To calculate braking force use F=mxa
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when is an object elastically
An object is elastically if it returns to its original shape when the forces deformed are removed
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elastically deformed
We say an object is elastically deformed if the elastic material can change shape
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extension
the increase in lenght
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Hooke's law
Hooke's law says that the extension of a spring is directly proportional to the force applied as long as its limit of proportinality is not exceeded
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equation for force applied
Force applied,F= spring constant,K x extension,e
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## Other cards in this set

### Card 2

#### Front

Physical quantites that have size but no specific direction such as distance and speed

Scaler

### Card 3

#### Front

Physical quantites that have a size and direction such as displacment and force

### Card 4

#### Front

Te size of a quantity is its magnitude. Vectors have a magnitude and direction but scalers only have a magnitude

### Card 5

#### Front

Any vector quantity can be represented by an arrow. The direction of the arrow shows the direction of the vector quantity and the lenght of the arrow represents the magnitude of the vector quantity

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