What is a force?
A push or pull motion exited by one object to another.
Is force a vector?
Yes
What qualities must something have for it to qualify as a vector?
direction and magnitude (size)
What happens when all forces on an object are balanced?
They cancel each other out, they behave as if there are no forces on it at all
What are 3 examples of balanced forces?
- Stationary gymnast on a beam
- Skater with steady velocity
- Skydiver with steady velocity
What is terminal velocity?
When your speed and air resistance increases, eventually it is enough to balance the objects weight and it gains no more speed
What is a typical terminal velocity?
60m/s
What is inertia?
Resistance to change velocity
What do two unbalanced forces equal to?
a singular force
What is a resultant force?
When two unbalanced forces make one singular force
What is the equation for resultant force?
Resultant force = mass x acceleration
What is friction?
the force that tries to stop materials sliding over each other
What are two types of friction?
Dynamic and Static force
What is drag and another term for it?
Drag is when objects experience friction when they move through liquid or gas and is can also be called air resistance
What is gravitational force?
When you measure something on a spring balance, you measure a downward pull from the earth, the pull is gravitational force
What is weight measured in?
Newtons
Roughly how much would an object with a mass of 1kg weigh in newtons?
9.8 N but we say 10 N
What is gravitational field strength?
the region n in which the mass experiences a force due to gravitational attraction
What is earth’s gravitational field strength?
10 N/kg
What is the formula for weight?
weight = mass x g (g = 10N/kg)
What are the two meanings of g?
- Gravitational field strength
- acceleration of free fall
What are paired forces known as?
Reaction and action
What is the formula for acceleration?
change in velocity / change in time
What is the formula for resultant force?
change in momentum / time
