Dynamics Flashcards
What is Newton’s first law of motion?
The law of inertia (tendency for an object to resist change- an object at rest will stay at rest, an object moving at a constant velocity will continue to move at a constant velocity)
What is Newton’s second law of motion?
F=ma. The acceleration of an object is dependent on the net force acting on it and the mass of the object.
What is Newton’s third law of motion?
For every action, there is an equal but opposite reaction.
Normal force
The perpendicular force exerted by a surface on another object and is always perpendicular to the plane of contact.
What is the formula for the force of a scale?
Fnet= Fg+Fscale
Kinetic friction
Acts on moving objects. Exerted on one surface by another when the two surfaces rub against each other.
Static friction
The force exerted on one surface by another when there is no motion between the two surfaces
Hooked ‘s Law
The force exerted by a spring is equal to the spring constant times the distance the spring is compressed or stretched from its equilibrium position.
Impulse
The product of the average force on and object and the time interval over which it acts. Area under force-time graph.
Impulse-Momentum Theorem
The impulse on an object is equal to the objects final momentum minus the objects initial momentum.
What causes impulse or a change in momentum?
A very large force acting over a short period of time or a very small force acting over a long period of time.
The Law of Conservation of Momentum
States that the momentum will not change unless an unbalanced force acts on the object. When objects collide, they produce equal but opposite forces on each other.
