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Physics - Forces and motion part 1 (4th form) Section 1 (Units (Newton (N)…
Physics - Forces and motion part 1 (4th form) Section 1
Units
Newton (N)
Second (s)
Metre/second2 (m/s2)
Newton/kilogram (N/kg)
metre/ second (m/s)
Newton Metre (Nm)
Metre (m)
Kilogram metre/second (kg m/s)
Kilogram (kg)
Equations
Acceleration = change in velocity ÷ time taken a = (v-u) ÷ t
V² = U² + (2 x a x s)
Average speed = distance moved ÷ time taken
(-u²) v² - u² = 2 x a x s
( ÷2 x s) v² - u² ÷ 2 x s = a
Resultant force = mass x acceleration
weight = mass x gravity
Distance-time graph
Velocity-time graph
Facts I need to remember
Weight is the pull of gravity on mass (N).
Mass is the amount of matter.
Thinking distance
The distance travelled by a vehicle between the time that it needs to brake is perceived and the time that the brakes are applied.
Factors that affect the Thinking distance:
Alcohol will make the thinking distance will increase.
Speed of car, the faster the car is going the longer the thinking distance.
Tiredness, the more tired a person is the bigger the thinking distance will be .
Drugs will also increase the thinking distance.
Breaking distance
The distance the car travels while the car is breaking.
Factors that affect the Breaking distance:
Breaks, if the breaks are in a good condition then the less distance will be needed.
Weight, the more weight the longer distance needed to stop.
Ice, will mean there will be a longer distance needed.
Wet roads, The less friction so will need a bigger distance.
Drag & Terminal velocity for an object moving through fluid
At the start only weight acts
So there is a resultant force downwards.
So there is an acceleration downwards
As speed increases; air resistance increases.
Until eventually drag = weight.
So there is no resultant force .
F= m x a
So there is no more acceleration (constant speed)
This is called terminal velocity.
Resultant Force
F = m x a
Resultant force is one single force which could replace all other forces and have the same effect.
Example:
Example 2:
Example 3:
