Forces and quantities - IG Physics notes Flashcards
Scalar
A physical quantity with only magnitude
Vector
A physical quantity with both magnitude and direction
Vector quantities (name first 5 w/ units)
- Displacement (m) - Gravitational field strength
- Acceleration(ms^-2) - Electric field strength
- Velocity (ms^-1)
- Force (N)
- Momentum (Ns)
Scalar quantities (name 5 w/ units)
- Distance (m)
- Time (s)
- Mass (kg)
- Work/Energy (J)
- Temperature (˚C)
- Frequency (Hz)
- Voltage (V)
Fn
Normal (or reaction) force, preventing object from accelerating due to gravity
Fg
Force due to gravity, pulling object toward the Earth
Free body diagram
Shows the magnitude and direction of multiple forces acting on a visible object
T/F: Forces are a scalar quantity
F; they have direction too
Fres
Resultant (net) force; a single force that has an identical effect to two or more forces acting together.
R
Resultant (net) force; a single force that has an identical effect to two or more forces acting together.
Fnet
Resultant (net) force; a single force that has an identical effect to two or more forces acting together.
T/F: Acceleration is a vector quantity
T
Fres calculation diagram
- If all present forces are perpendicular add the square of both and find the root of the sum
- If the forces are non-perpendicular draw a scale diagram (see notes for detail)
Fres description format – scale diagram
Fres = [Fnet] at an angle of [measured angle] (anti)clockwise from [nearest known vertical force] force.
i.e. “Fres = 20N at an angle of 80˚ clockwise from 14N force. “
Define force
A vector quantity causing a change in object velocity – altering its speed or direction
