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Mechanics 1
- Scalars and Vectors
- Mass
temperature,
time, length,
speed,
energy,
- Displacement,
force,
velocity,
acceleration,
momentum
- Use Pythagoras' Theorem
to find the resultant force
- Split vectors into horizontal and vertical
components and use trigonometry
- Mass
temperature,
time, length,
speed,
energy,
- Free fall
- Acceleration is a vector - 'g' is
vertically downwards
- The only force acting on an
object in free fall is its weight
- Aristotle
- 'Heavy objects fall quicker than lighter objects'
- 'Heavy objects fall quicker than lighter objects'
- Galileo
- 'All objects in free fall accelerate at the same speed'
- distance is directly proportional to the time taken ^2
- Rolled balls of different mass down a
smooth surface, recording the time it
took to reach the bottom
- 'All objects in free fall accelerate at the same speed'
- Projectile Motion
- 1) resolve initial velocity into vertical and
horizontal 2) solve vertical using linear motion
3) solve horizontal using speed = distance/time
- 1) resolve initial velocity into vertical and
horizontal 2) solve vertical using linear motion
3) solve horizontal using speed = distance/time
- Acceleration is a vector - 'g' is
vertically downwards
- Newtons Law of motion
- As you get close to the speed of light, the
mass starts to increase!
- Displacement - has both a magnitude and a direction
- Vectors can be resolved into components
- x-direction: F x cos(angle)
- y-direction: F x sin(angle)
- x-direction: F x cos(angle)
- As you get close to the speed of light, the
mass starts to increase!
- Moments and Torque
- Force x Perpendicular distance from pivot
or Force of one x perpendicular distance
between both forces.
- Couple
- A pair of forces of equal size which act parallel
to each other, but in opposite directions
- A pair of forces of equal size which act parallel
to each other, but in opposite directions
- Force x Perpendicular distance from pivot
or Force of one x perpendicular distance
between both forces.
- Car Safety
- Thinking Distane
- Reaction
time,
tiredness,
alcohol,
drugs,
illness,
distractions.
- Reaction
time,
tiredness,
alcohol,
drugs,
illness,
distractions.
- Braking Distance
- Braking
force,
friction,
mass,
speed
- Braking
force,
friction,
mass,
speed
- Seat belts - increase the time that you are brought to a stop
- Airbags
- accelerometer is used to detect rapid deceleration
- This, if triggered, causes a chemical
reaction to occur which releases gas.
- fills the air bag and makes you stop over a longer period of time
- fills the air bag and makes you stop over a longer period of time
- This, if triggered, causes a chemical
reaction to occur which releases gas.
- accelerometer is used to detect rapid deceleration
- Crumple zones - absorb some of the energy
- GPS systems
- Use trilateration to find your positioning
- time delay between satellite signal being sent and being
received us used to find distance using the speed of light.
- Use trilateration to find your positioning
- Thinking Distane
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