P10 - Force and motion Flashcards
What is the equation for stopping distance?
Stopping distance = Thinking distance + Breaking distance
What is the equation for Momentum?
Momentum (Kg m/s) = Mass x Velocity (m/s)
What is momentum?
The tendency of an object to keep on moving in the same direction
What is the symbol for Momentum?
p
What is the unit for Momentum?
Kg m/s
What is the unit for Mass?
Kg
What is the equation for momentum?
Momentum = mass x velocity
What is Newtons second law in P10?
The acceleration of an object is directly proportional to the force
What factors affect thinking distance?
Tiredness
Alcohol
Distractions
Which factors affect braking distance
How fast you are going
Road conditions
The condition of your tyres
What is elastic deformation?
When a spring is stretched it can return to its original length
What is inelastic deformation?
When a spring is stretched, its length is permanently altered
What is the limit of proportionality?
The length a spring can be stretched before it can no longer return to its original length
What is the Hookes Law equation?
Force applied = spring constant x Extension
What is the unit for Extension?
Metres
What is the unit for the Spring Constant?
Newtons per Metre
What does the term ‘closed system’ mean?
A system with no external forces acting on it
What is the conservation of Momentum?
The total moment before an event has the same momentum after the event
What is the effect of force on acceleration?
The greater the resultant force, the greater the objects acceleration
Why do cars make safety systems to prolong thr length of impact time?
The longer the impact time, the more the impact force is reduced
What is inertia?
The tendency of an object to continue to move at the same motion - even after an event
Explain why an egg is less likely to break when dropped onto soft foam rather than onto a concreate floor? (GCSE question)
Softer landing will reduce the impact force
The longer the impact time, the more the impact force is reduced
What is the equation linking force, spring constant and extension?
Force = spring constant x extension
How do you calculate Elastic potential energy?
Elastic potential energy = 1/2 x spring constant x extension°2
