motion and forces Flashcards
(16 cards)
which law describes how ‘ A moving object will continue to move at the same speed and direction unless an external force is acted upon it’?
Newtons first law
Which law describes how the ‘acceleration in the direction of a resultant force depends on the size of the force and the mass of the object’?
newtons second law
which law describes how ‘if an object exerts a force on an another object then that object exerts an equal force’?
newtons third law
what is the equation that ties weight, mass and gravitational field strength?
weight = mass x gravitational field strength
what is the equation that ties force, mass and acceleration?
Force = mass x acceleration
what is the equation that ties momentum, mass and velocity?
momentum = mass x velocity
what is the equation to calculate the force using change of momentum?
force = change in momentum /time taken
What is the ‘thinking distance’?
Time taken for the driver to react to a situation
What is the ‘Braking distance’?
the distance travelled by a vehicle after the breaks are applied
what are some factors effecting the stopping distance??
Drugs, tiredness, weather, worn brakes, mass of car, speed travelling
what are scaler and vector quantities?
scalar: quantities that include distance, speed, energy and time
vector: quantities that include have both size and direction
what is the equation connecting distance speed and time?
distance = speed x time
what is the equation to find acceleration
acceleration = change in velocity/time
what is the equation for velocity
velocity = displacement /time
What is the equation for newtons second law of acceleration?
Force = mass x acceleration (F = MA)
How do seatbelts and crumple zones reduce injury in a car crash?
They increase the time it takes for a car to stop to reduce the impacy
