Kinematics Flashcards
Vectors versus scalars
A vector quantity has both magnitude and direction whereas a scalar only has magnitude.
Cross product of vectors
A x B = |A| |B| sin (θ)
Results in a vector.
Dot product of vectors
A · B = |A| |B| cos (θ)
Results in a scalar.
Any interaction that will cause acceleration if unopposed.
Force
Force as a result of attraction between masses.
Gravity.
Gravitational force exerted by the Earth on an object is called weight
Force.
Equations:
1. Torque (rotational force)
2. Friction
3. Friction on an inclined plane
Name Newtons Law
The law of inertia.
An object at rest will stay at rest, and an object in motion will stay in motion, without an external force.
Newton’s first law
Name Newtons Law
Fnet = m⋅a
A net force acting on an object will cause it to accelerate in the direction of the force.
Newtons second law
Name Newtons Law
Action-reaction.
Every force has an equal and opposite force.
Newtons third law
Displacement versus distance
Displacement is a vector representation of a change in position and is path-independent, whereas distance is a scalar representation and path-dependent.
Velocity versus speed
Velocity = displacement / time. Result is a vector
Speed = distance / time. Result is a scalar
Four kinematics equations
- Velocity as a function of initial velocity, acceleration, and time
- Velocity as a function of initial velocity, acceleration, change in distance
- Displacement as a function of initial velocity, acceleration, time
4. Displacement as a function of initial velocity, velocity, time
Equation for projectile motion
Equations for circular motion
centripetal acceleration vs centripetal force
