2. Forces and motion Flashcards
(15 cards)
If resultant force of object is zero….
It is balanced
If resultant force of an object is not zero….
It is unbalanced
Newton’s 1st law
An object will continue to be at rest or travel at constant velocity unless a resultant force is acted on it
Newton’s 2nd law
More force means more acceleration, more mass means less acceleration
Newton’s 3rd law
If an object exerts a force on another object, the 2nd force exerts an equal and opposite force on the first
3rd law: Action-reaction
The two forces are always the same size and opposite direction
EQUATION: (N) = (kg) x (N/kg)
Weight = mass x gravitational field strength
Gravitational Field Strength on earth is….
10 newtons per kilogram (10N/kg)
Mass is….
The quantity of matter in an object
Weight is…
A measure of the pull of gravity on an object
Measure weight using a…
Force meter (N)
EQUATION: (N) = (kg) x (m/s2)
Force = Mass x Acceleration
Acceleration of an object is…
A measure of how much its velocity changes in a certain time
EQUATION: P (kg m/s) = m (kg) x v (m/s)
momentum = mass x velocity
Momentum is…
A measure of tendency of an object to keep moving
