P8 Flashcards
Displacement
Distance without a change in direction
Vector Quantity
A physical quantity with size and direction
Eg. Acceleration, force, weight, velocity, displacement
Scalar Quantities
Physical quantities with size and no direction
Eg. Mass, speed, time, distance, energy
What can force cause an object to do?
Change motion.
Change direction.
Change rest state.
Contact force
Force between two objects that requires them to touch.
Eg. Friction, air resistance, tension, thrust.
Non-contact force
Force between two objects that requires them not to touch.
Eg. Magnetic, gravitational, electrostatic, nuclear.
Newton’s third law
When two objects interact with eachother, they exert equal and opposite forces on one another.
Friction
The force exerted on a surface by an object when it moves across it.
Resultant Force
When multiple forces act on an object, it is a singular force with the same effect.
Balanced Force
Newton’s first law of motion, if the resultant force acting on an object is 0, then the forces are balanced.
Unbalanced force
If the resultant force acting on an object is not 0, the forces are unbalanced.
Centre of mass
The point at which an object’s mass is concentrated.
Why mightn’t a tilted vehicle fall over?
The centre of mass may fall inside the base, so there is no resultant moment.
