P10 Flashcards
What is the equation for resultant force?
Resultant force= Mass x acceleration
What is newtons second law?
The acceleration of an object is:
- Proportianal to the resultant force on the object.
- Inversely proportional to the mass of the object.
What is inertia?
Tendacy of an object to stay at rest or to continue in uniform motion.
What is the weight of an object?
The force acting on it due to gravity.
What is mass?
Depends on the quantity of matter in it.
What is the equation for weight?
Weight= Mass x gravitational field strength
What is gravitational field strength measured in?
N/kg
When an object is fmoving at terminal velocity what is the resultant force on it?
0
What is thinking distance?
The distance travelled by the vehicle in the time it takes the driver to react.
What is braking distance?
The distance travelled by the vehicle during the time the braking force acts.
What is the equation to find out force? (gives the braking force of a vehicle)
Force= Mass x Acceleration
How do you find out the stopping distance?
Stopping distance= Thinking distance + braking distance
What is the equation of the momentum of a moving object?
momentum of a moving object= Mass x Velocity
What is the law of conservation of momentum?
In a closed system, the total momentum before and event is eaual to the total momentum after the event.
What is the equation for acceleration?
Acceleration= (final velocity - initial velocity)/divided by/ time taken
What is the equation of force?
Force= (mass x change of velocity)/divided by/ time taken
What do crumple zones and side bars do?
They increase the impact time and this then reduces the imact force on the car.
What is hooke’s law?
The extension of a spring is directly proportional to the force applied, as long as it’s limit of proportionality is not exceeded.
What is the equation of force applied?
Force applied= spring constant x extension
What makes an object elastic p?
If it returns to it’s original shape when the forces deforming it are removed.
Directly proportional?
A graph will show this if the line of best fit is a straight line through the origin.
Elastic?
A material is elastic if it is able to regain it’s shape after it has been squashed or stretched.
Extension?
The increase in length of a spring from it’s original length.
Gravitational field strength?
The force of gravity on an object of mass 1kg. It is also the acceleration of free fall.
Limit of proportionality?
The limit for hooke’s law applied to the extension of a streched spring.
Mass?
The quantity of matter in an object – a measure of the difficulty of changing the motion of an object (in kilograms, kg).
Momentum?
Mass x velocity.
Newton’s second law of motion?
The acceleration of an object is proportional to the resultant force on the object, and inversely proportional to the mass of the object.
Stopping distance?
The distance travelled by the vehicle in the time it takes for the driver to think and brake.
Terminal velocity?
The velocity reached by an object when the drag force on it is equal and opposite to the force making it move.
Weight?
The force of gravity on an object ( in newtons).
