Physics Flashcards
Accuracy
A measurement if accurate if the value is close to the actual value
Precision
Measurements are precise if they show little spread/deviation from each other
Speed
Distance traveled per unit time
Displacement
Distance traveled in a specific distance
Velocity
Displacement traveled with respect to time
Scalar quantity
A quantity that has a magnitude but no direction
Vector quantity
A quantity that has a magnitude and a direction
Acceleration
Rate of change of velocity with respect to time
Thinking distance
Distance traveled from when the driver sees a problem to press the brakes
Braking Distance
Distance traveled from when the driver presses the brakes and comes to a stop
Stopping distance
Distance traveled from where the driver sees the problem to when the car completely stops
Newton
1 Newton is the force required to cause a 1kg mass to have an acceleration of 1 metre per second per second
Weight
The gravitational force experienced by an object
Drag
the resistive force experienced by an object MOVING through a fluid
Terminal velocity
The constant speed reached when the drag equals the weight of the object in magnitude and is opposite in direction
Moment of a force
Force multiplied by perpendicular distance from the force from the pivot
Principle of Moments
When an object has not net moment the sum of the clockwise moments equals the sum of the anticlockwise moments about the same pivot
Equilibrium
No net moment or net force
Couple
A couple is created when there are 2 parallel equal but opposite in direction forces
Torque of a couple
Force multiplied by the perpendicular distance between the forces
Centre of Gravity
The point where the entire weight of the object appears to act
