Section 1 Forces And Motion Flashcards
Formula for density
Mass/volume
Units for mass and weight
Kg and N
What is the gradient of a distance time graph
Straight horizontal line
Acceleration equation
Change in velocity/change in time
Gravitational field strength equation
Weight/mass
How to calculate resultant vectors
Pythagoras or sohcahtoa
How to calculate resultant force
Mass x acceleration
What is the resultant force on an object moving at constant speed
0N
What is solid friction
The force between 2 objects that are moving or trying to move past each other that impedes motion and produces heatint
In which direction does drag act compared to the motion of an object
In the opposite direction to the motion
What can you say about the forces on a falling object at its terminal velocity
Air resistance is equal to the weight because of gravity
Spring constant equation
Spring constant = force/extension
Equation for moment
Moment = force x perpendicular distance from the pivot
Equation for momentum
Momentum = mass x velocity
How to calculate momentum before
Mass x velocity + mass x velocity choose one direction as positivr
Momentum after equation
Momentum before/added mass
Impulse meaning
The size of a force x the length of time it acts for. It equals the change of momentum of the object
Units for impulse
Ns
Impulse equation
Force x time
How to calculate change in momentum
Force = change in momentum/change in time
State the principle of moments
If an object is balanced the total anticlockwise moments equal the total clockwise moments
What effect does drag have on motion
Resists motion
