Forces Flashcards
the unit of force is what?
Newton (N)
when two objects interact they always exert what?
equal and opposite forces on each other.
what is a resultant force?
a single force that has the same effect as always the forces acting on an object combined.
if the resultant force on an object is not zero what will change about the object?
the velocity.
the bigger the resultant force the
greater the acceleration
what is the formula for resultant forces?
Resultant force (in Newtons) = mass (Kg) x acceleration (meters/second
the braking distance depends on what?
the thinking and braking distance
what 4 things can effect the breaking distance?
- Tiredness, alcohol and drugs
- The speed of the vehicle
- road surface/conditions
- poorly maintained vehicles
formula for stopping distance
thinking distance + braking distance = stopping distance.
the formula for weight
mass (Kg) x gravitational field strength (N/Kg) = weight (N)
terminal velocity is reached when?
the weight force is equal to the drag force on the object thus it stops accelerating and falls at a constant speed.
the extension is calculated how?
length extended - its original length = the extension of material
what is hookes law?
the extension of a spring is directly proportionate to the force applied (provided the limit of proportionality isn’t exceeded)
how can we write Hooke’s law in an equation?
spring constant (N/m) x extension = Force Applied
how can we write Hooke’s law in an equation?
spring constant (N/m) x extension = Force Applied
