Resultant forces
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- Created by: mackymoo
- Created on: 22-04-17 23:18
Forces 1
Measured in Newtons.
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Forces 2
Object always exert equal and opposite on each other when they interact.
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Forces 3
A force can change the shape of an object or change its motion or state of rest.
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Resultant forces 1
The single force that would have the same effect on the object as all the original forces acting together.
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Resultant forces - forces at 0
If the object is at rest then it will stay at 0.
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Resultant forces - forces at 0
if the object is moving it will carry on moving at the same speed and in the same direction.
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Resultant forces - forces not at 0
There will be an acceleration in the same direction if the force.
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Resultant forces - forces not at 0
If the object is at rest, it will accelerate in the direction of the resultant force.
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Resultant forces - forces not at 0
If the object is moving in the same direction as the result force, it will accelerate in that direction.
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Resultant forces - forces not at 0
If the object is moving in the opposite direction to the resultant force it will decelerate.
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Resultant forces 2
Always causes an acceleration.
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Acceleration
Change in velocity.
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Objecting accelerating
By changing its direction even if it is going at constant speed. The resultant force is needed to make the object change direction.
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Resultant force3
F= M X A
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Greater the resultant force
The greater its acceleration.
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Mass on object
The bigger the mass on a object the bigger the force needed to give it a acceleration.
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Momentum
All moving objects have momentum. Momentum has a size and direction.
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Greater the momentum
The greater the mass and velocity the greater the momentum.
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Momentum equation
P = M X V
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The law of conservation of momentum
Whenever objects interact the total momentum before the interaction is equal to the total momentum afterwards.
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The law of conservation of momentum
The total momentum is unchanged or the change in the total momentum is zero.
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Momentum in the opposite direction
Means its negative.
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Explosions
When two objects push each other apart, they move apart, with equal and opposite momentum so their total momentum is 0.
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Explosions
When two objects push each other apart, they move apart with different speeds if they have unequal masses.
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Impact forces
When a force acts on an objet that is able to move, or is moving its momentum changes.
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Change in momentum
The longer the time taken for the change, the smaller the force that acts.
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In a collision (momentum)
The momentum of an object changes as a result of a force acting on the object.
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Impact time
If the impact time is short the force on the object is large. Making the impact time longer which makes the force smaller.
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Change in momentum equation
F = Change in momentum/Time
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Collision of vehicles
The force of the impact depends on the mass,change of velocity and the duration of the impact.
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When two vehicles collide
They exert equal and opposite forces on each other and their total momentum is unchanged.
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Crumple zones
They are in cars and are designed to fold in collisions. This increases the impact time so reduces the force on the car and the people in it.
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Seat belts
In car to reduce the force of an impact by increasing the time over which the persons momentum changes.
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Car safety - Seat belts and air bags
Seat belts and air bags spread the force across the chest and they also increase the impact time.
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Side impacts bars and crumple zones
They give way in an impact so increasing the impact time.
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Using the conservation of momentum
To find the speed of a car before an impact.
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Driving force and resistive force
The driving forces are equal and opposite to the restive force.
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Resistive force
The resistive force are caused by air resistance and by friction between the parts that move against each other.
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The faster the speed of the vehicle
The bigger the deceleration needed tons top it in a particular distance. so they bigger the braking force needed.
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Stopping distance
The distance a vehicle travels during the driver reaction time plus the distance it tearless under the braking force.
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Thinking distance
It is increase if the driver is tired or under the influence of drugs and alcohol.
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Braking distance
Is increase by - poorly maintained roads, bad weather, the condition of the car E.g. worn tyres.
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Friction and air resistance
oppose the driving force of a car.
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Effects of stopping distance
depends on the thinking and braking distance.
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Forces and terminal velocity
If an object falls freely the resultant force acting on it is the force of gravity.
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Acceleration due to gravity
The force of gravity weight and the acceleration.
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Other cards in this set
Card 2
Front
Object always exert equal and opposite on each other when they interact.
Back
Forces 2
Card 3
Front
A force can change the shape of an object or change its motion or state of rest.
Back
Card 4
Front
The single force that would have the same effect on the object as all the original forces acting together.
Back
Card 5
Front
If the object is at rest then it will stay at 0.
Back
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