P8 - Forces In Balance Flashcards
Displacement
Distance in a given direction
Driving force
Force of a vehicle that makes it move
Force
A force can change the motion of an object
Free-body force diagram
A diagram that shows the forces acting on an object without any other objects or forces shown
Friction
The force opposing the relative motion of two solid surfaces in contact
Magnitude
The size or amount of a physical quantity
Newton’s first law of motion
If the resultant force on an object is zero, the object stays at rest if it is stationary, or it keeps m speed in the same direction
Newton’s third law of motion
When two objects interact with each other, they exert equal and opposite forces on each other.
Resultant force
A single force that has the same effect as all the forces actiong on the object
Scalar
A physical quantity, such as mass or energy, that has magnitude only (unlike a vector which has magnitude and direction)
Vector
A vector is a physical quantity, such as displacement or velocity, that has a magnitude and a direction (unlike a scalar which has magnitude only)
Examples of vector quantities
Force, velocity, displacement, acceleration, momentum
Examples of scale quantities
Speed, distance, mass, temperature, time
Examples of contact forces
Friction, air resistance, tension in ropes, normal contact force
Examples of non-contact forces
Magnetic force, gravitational force, electrostatic force
Gravitational force
Force of attraction between masses
Mass
Mass is just the amount of stuff in an object. For any given object this will have the same value anywhere in the universe.
Weight
The force acting on an object due to gravity.
Acceleration
How quickly you speed up
Uniform acceleration
Constant accleration
Which direction does friction act?
Opposite direction to movement
Drag
The resistance you get in a gas/liquid (fluid)
Air resistance
Type of drag - it’s the frictional force produced by the air acting on a moving object
Momentum
Mass x velocity
