Forces 3 Flashcards
What is Newton’s second law of motion
The acceleration of an object is
Proportional to the resultant force on the object
Inversely proportional to the mass of the object
What will a more massive object experience
A lesser acceleration
What is the mass of an object
Quantity of matter in it
What is an objects weight
The force of gravity that acts on the object
What is gravitation field strength
9.8 N/Kg
What happens when an object falls through a fluid
The fluid exerts a drag force, resisting its motion. The faster the object falls, the bigger the drags force.
What is terminal velocity
When the drag force equals weight of the object and there is no resultant force so the object moves at a constant velocity
What is the equation for stopping distance
Thinking distance + braking distance
What increases thinking distance
Drugs alcohol or use of mobile phones
What is the equation for acceleration using velocity squared
Initial speed squared (m/s)
— —————————————
2 x distance
What is momentum
Mass in motion
What is a closed system
A system in which the total momentum before an event is the same as the total after the event.
What is conservation of momentum
Whenever objects interact in a closed system, the total momentum before an event is equal to the total momentum after an event
What happens to two objects that push apart with unequal masses
They move with different speeds
What is the momentum of two objects that push apart with unequal mass
0
What is an elastic object
Is one that regains its shape when the forces deforming it is removed
What is the extension of a spring
The increase in the springs length from the original length
What does a line that passes through the origin of a graph tell you
It’s directly proportional
What is the limit of proportionality
the point beyond which Hooke’s law is no longer true when stretching a material.
What does the area under a hookes law table represent
Elastic potential energy
