Chapter 2: Dynamics Flashcards
Forces, Normal reaction, Friction, Newton's laws of motion, Terminal Velocity, Center of Gravity, Stability, Moments
What is a force?
An action that will change the motion of an object when unopposed
What is the normal reaction, and in what direction does it act?
It is a reaction to an applied force, and is always perpendicular to the surface along the place the force is acted on
What is friction?
A force that opposes motion between surfaces in contact
What is the difference between sliding and rolling friction?
Sliding friction acts against the direction of motion while rolling friction acts with the direction of motion
Is friction dependent on surface area?
No
What is tension?
A pull force exerted by a string, spring or rope on an object attatched to it
What are some types of non-contact forces?
Gravity, Electromagnetic, Electrostatic, Strong and weak nuclear forces
What is Newton’s first law of motion?
Every body contrinues in its state of motion unless an external force acts on it
What is Newton’s second law of motion?
Force applied = mass of object x acceleration of object
What is Newton’s third law of motion?
Every action has an equal and opposite reaction
What is inertia?
The property of a body that resists a change in the state of rest or uniform motion
What is terminal velocity?
The maximum velocity of a falling object in fluid medium, or when air resistance is equal to the weight of an object
What is the acceleration at terminal velocity?
0
What is the effect of mass of an object on its terminal velocity?
The greater the mass of an object, the higher its terminal velocity
What is the effect of surface area of an object on its terminal velocity?
The smaller the surface area of an object, the higher its terminal velocity
