What is displacement?
Displacement is distance without a change in direction.
What is a vector?
Vector: physical quantities with size (magnitude) and direction
What is a scalar?
Scalar:
Physical quantities with size but no direction
What are some examples of vector quantities?
Weight
Force
Distance
Velocity
Accleration
What are some examples of scalar quantities?
Mass
Speed
Time
Power
Displacement
Energy
Whats the difference between distance and displacement?
Displacement is distance without a change in direction displacement is a vector quantity and distance is a scalar quantity.
Whats the difference between speed and velocity?
Speed is how fat something is travelling it is a scalar quantity as it has size but no direction whereas velocity is the speed which something is travelling in a certain direction velocity is a vector quantity
What can a force do to an object (3 examples)?
Change shape ( stretch or sauash)
Change its motion ( accelerate/ deccelerate)
Change its state of rest (start moving)
Give some examples of a contact force
Friction
Air resistance
Tension
Thrust
Give some examples of non contact forces
Gravitational
Magnetic
Nuclear
Electrostatic
What is Newtons third law of motion?
When two objects interact with each other they exert equal and opposite forces on each other
What is friction?
Friction is the force exerted by a surface against an object when it moves across it.
What is weight?
The force of gravity pulling things downward It makes things fall and keep things on the ground.
What is upthrust?
Pushes things upwards when they are in liquid it pushes boats upwards so they do jot sink.
What is air resistance?
It tries to stop things moving through the air It pushes parachutes upwards sot hey fall lightly
What is reaction?
It stops things from going right through solid objects. When this force acts from your chair it pushes you upwards so that you will not fall through it
What is thrust?
A forward force from an engine for example
What is the resultant force?
Resultant force the force that has the same effect as all the forces acting on the object
What is a balanced force?
Newton’s first law of motion if the resultant force acting on an object is zero all the forces are said to be balanced
What is an unbalanced force?
If the resultant force acting on an object is not zero are said to be unbalanced
