momentum 5 Flashcards
Equation
Momentum (p) (in kg m/s) = mass m (kg) x velocity, v (in m/s)
symbol for momentum
p
What is the equation for force?
Force = change in momentum / time taken Force= (mv - mu) / t
What is the relationship between momentum before and after a collision?
Moment before the collision = moment after the collision
How do you increase momentum?
force x time = increase in momentum
What is force?
A vector quantity
How do air bags help increase car safety?
cushion and prevent cuts
How do helmets help increase car safety?
motor cyclists safety helmets padded inside so as to extend time of any collision
How do seat belts help increase car safety?
Stop you tumbling around inside the car if there is a collision
Change in momentum
force x time
Vector
symbol
Vectors have size and direction
ram
Scalar
symbol
Scalar quantities only have size
uni hat
Temperature vs
scalar
How do you work out resultant force?
Combine vectors
-Add them end to end
Location for force
5
location momentum
xtratherm
friction is a
Force
buoyancy location
23
friction loc
16
What is the strength of Earth’s gravitational field?
10 N/Kg (9.8)
What are forces measured in?
Newtons (N)
How do you work out weight?
weight = mass x g N = Kg x N/Kg
Weight loc
1
What happens if the forces acting in opposite directions are the same size to the unbalanced force
The unbalanced force is zero
