Physics Flashcards
What is the force of gravity on earth?
10N – kg
What happens to extension of an object if the force becomes too great?
The directly proportional extension of the object in relation to the force stops
What is momentum and what affects it?
Momentum is how quickly each kg of the object is moving
Momentum is affected by mass and velocity
In a car crash safety features are designed to do what?
Increase the time taken to slow the passengers down
All objects with elastic potential energy are all able to do what?
Return to their original shape
What is the equation for working out power?
Energy = Power x Time (e=pxt)
When are the forces of an object balanced
When it is still or travelling at a steady speed
What is Hooke’s law?
Extension of an elastic object is directly proportional to the force
What is resultant force and when is the resultant force on an object zero?
The overall force in one direction - this is zero when the object is stationary
During a collision or explosion between objects, what happens to the momentum?
The momentum in a collision or explosion is conserved
What do unbalanced forces do to the movement of an object?
It will cause the object to speed up / slow down
What can be described as a fluid?
Gases and liquids
What happens to the frictional forces as an object accelerates through a solid?
Frictional forces increase as the speed increases but eventually reach terminal velocity
What safety features do you find in cars to help reduce the affect of momentum during a crash?
Seatbelts, Crumple zones, Air bags, Side impact bars
How can you work out the distance traveled from a velocity time graph?
Work out the area beneath the graph
