5. Forces
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What’s a force?
Any interaction that, when unopposed, changes the motion of an object
What’s normal force?
The perpendicular contact force exerted by a surface on an object.
What’s net force?
The vector sum of all the forces acting in an object.
What are opposing forces?
Any force working in the opposite direction to the mass is going. Ex. Friction would make the force negative since its working against it.
What are balanced forces?
Forces that are equal in size but opposite in direction
What are frictional forces?
the resistive force generated when two surfaces slide or attempt to slide against one another
What’s friction?
The force that opposes motion between surfaces in contact.
Whats’ newtons first law?
The law of inertia. An object at rest will stay at rest, and an object in motion will stay in motion with constant velocity, unless acted upon by a net external force.
Whats’ newtons second law?
The law of acceleration. The acceleration a of an object depends on the net force F applied and the object’s mass m.
What’s inertia?
The resistance of any physical object to change in its state of motion.
What’s newtons third law?
For every action, there is an equal and opposite reaction force. Equal in magnitude, opposite in direction.
What happens when two forces act in the same direction?
They add together
What’s weight defined as?
The force due to gravity acting on the mass.
What’s mass defined as?
the amount of matter in an object
What’s a newton?
The force required to accelerate 1kg of mass at 1m/s^2
An unbalanced force acting on an object causes it to
accelerate
The greater the mass of an object,
the more space it takes up