P8- Forces Flashcards
What is a scalar quantity?
Only has magnitude
What is a vector quantity?
Has both direction and magnitude
What is a force?
A push or pull that acts on an object due to interaction with another object
Is force scalar or vector?
Vector
What is a contact force?
When objects are physically touching
Name the main contact forces (4)
Friction, air resistance, tension, normal contact force
What are non contact forces?
Occur when objects are separated
What are the main three contact forces? (3)
Magnetic force, gravitational force, electrostatic force
What is the same about the interaction of two forces when objects interact with each other?
The sizes of the force
What is different about the interaction of two forces acting on an object?
They act in different directions
What is the resultant force?
A single force that has the same effect as two or more forces acting together
How do you calculate the resultant force of forces acting in the same direction?
Add the magnitudes
How do you calculate the resultant force of forces acting in different directions?
Calculate the difference
What is the size of the resultant force on an object if forces are balanced?
0
What is the name of the force that cats on an object due to gravity?
Weight
What is the centre of mass?
Point through which the weight of an objects is considered to act
What does the length of the line of a free body diagram?
Magnitude
What is defamation?
The change in the shape of an object
What is elastic deformation?
The objects returns to its original shape when forces are removed
What is inelastic deformation?
When an object does not return to its original shape when forces are removed
What is hookes law?
F=ke
Extension is directly proportional to force
What is the limit of proportionality?
The point when hookes law no longer applies when stretching a material
How is spring constant calculated from a graph?
Calculate the gradient
