3. Dynamics Flashcards
What is Newton’s first Law?
A body stays at rest or continue to moves with uniform velocity unless a resultant force acts on it.
What is inertia?
Inertia of a body is the property of a body to resist change in its motion.
What is the formula of Weight of a free falling object on earth?
W=mg
What is Linear momentum?
Linear momentum is defined as the product of the mass of the body and its velocity.
What is the formula of linear momentum?
p = mv , p is linear momentum
What is Newton’s 2nd Law?
N2L states that the rate of change of momentum of a body is proportional to the resultant force acting on the body and takes place in the direction of the resultant force
What is the formula of Force? (3 different)
Fnet = ma
Fnet = d(mΔv) / dt
Fnet = Δp / Δt
What is Newton’s 3rd Law?
N3L states that if body A exerts a force on body B, then body B will exert a force of the same type that is equal in magnitude and opposite in direction on body A
What are the conditions for action-reaction pairs?
- they are the same type of forces
- they act on 2 different bodies
- they are equal in magnitude but opposite in direction
The pushing force by the man on a stationary box and the contact force by the stationary box on the man cancels each other out. T/F
False, only forces acting on the SAME object can cancel each other out
What is Impulse ?
Impulse is the product of the average force acting on the body and the time the average force is acting on it, and is equal to the change in momentum of the body as a result of the application of the force.
What is the equation of impulse?
∫ Fnet dt (impulse) = ∫ dp (change in momentum)
What is the principle of conservation of linear momentum?
Principle of linear momentum states that the net momentum of a system remains constant provided no external resultant force acts on the system.
Whats the difference between elastic and inelastic collisions?
kinetic energy is conserved in elastic collisions but not conserved in inelastic collisions.
What is mass?
Mass is the property of a body which resists change in motion (inertia).
