Topic 2 🏋️♀️🥊 Flashcards
What is a vector?
Magnitude and direction
What is a scalar quantity?
Magnitude only
Give an example of a vector?
Velocity, displacement, momentum, force, acceleration
Give an example of a scalar quantity?
Speed, distance, energy
Complete the equation.
Velocity =
Displacement / Time
Complete the equation.
Acceleration =
Change in Velocity / Time
Complete the equation.
Average Speed =
Distance / Time
Complete the equation.
Distance travelled =
Average Speed x Time
What is the typical walking speed?
1.5 m/s
What is the typical running speed?
3 m/s
What is the typical cycling speed?
6 m/s
What is the typical speed of sound?
330 m/s
What experiment do you do to measure human reaction times?
Ruler Drop
What is the typical speed for the ruler drop experiment?
0.2 - 0.9 seconds
What do light gates remove uncertainty about?
Remove uncertainty about measuring time as no human reaction time
In velocity time graphs what does the gradient =
Acceleration
In what graph is the area of the shape underneath the graph equal to the distance?
Velocity time graphs
What does the gradient = in distance time graphs?
Speed
Stopping distance =
Thinking distance + braking distance
Give examples of things that affect thinking distance?
Fatigue, drugs, alcohol
Give examples of things that affect braking distance?
Road, weather, vehicle conditions
What is weight measured with?
Newton - meter
What is weight measured in?
Newtons
Complete the equation.
Weight =
Mass x Gravitational Field Strength
What is Gravitational field strength measured in?
N / kg
What is centripetal force?
Acts towards centre of circle.
Causes acceleration that changes velocity
In circular motion,
Velocity is…
Constantly changing
In circular motion.
Speed…
Stays constant
Momentum =
Mass x velocity
What is momentum measured in?
Kg m/s
What is the conservation of momentum?
Total momentum before event = total momentum after event
During collisions
Force =
Rate of change in momentum
What do seat belts allow regarding momentum?
More time to change momentum.
Smaller rate if change of momentum so lower force.
Is displacement a vector or scalar quantity?
Vector
Is distance a scalar or vector quantity?
Scalar
Is velocity a vector or scalar quantity?
Vector
Is speed a vector or scalar quantity?
Scalar
Is acceleration a vector or scalar quantity?
Vector
Is force a vector or scalar quantity?
Vector
Is weight a vector or scalar quantity?
Vector
Is mass a vector or scalar quantity?
Scalar
Is momentum a vector or scalar quantity?
Vector
Is energy a vector or scalar quantity?
Scalar
What is acceleration in free fall?
10 m/s²
