1What is newton’s 2nd law?
The acceleration of a body of constant mass is directly proportional to the amount of resultant force acting on it
2What is the formula for resultant force?
$F_{net} = mass\space(kg) \times acceleration\space (m/s^2)$
3What’s newton’s 1st law?
An object at rest tends to stay at rest and an object in motion tends to continue in motion at constant speed in a straight line (uniform velocity) unless a resultant force acts on it.
4What’s newton’s 3rd law?
For every action, there is an equal and opposite reaction
5What characteristics must the forces from newton’s 3rd law fulfill?
They occur in pairs with each pair made of an action and reaction; Action and reaction are equal in magnitiude; Action and reaction act in opposite directions on different bodies
6What is friction?
Friction is a type of contact force that acts on two surfaces rubbing against each other, opposing the movement of one surface against another
7What are the effects of friction?
heat and noise causing wear and tear
8What are some ways to reduce friction?
Ball bearings, lubricants such as oil and grease and hovercraft rides on cushion of air
9What is the direction of frictional force?
It always acts in a direction that is opposite to the direction of the applied force