Chapter 3: Dynamics Flashcards
(11 cards)
Define mass.
Mass is the property of a body which resists change in motion.
Define momentum.
The linear momentum of the body is defined as the product of its mass and its velocity.
Define force.
A force is a push or pull that can cause a change in momentum to a body when acting on it.
State Newton’s First Law of Motion.
In the absence of a resultant force acting on it, a body at rest will remain at rest and a body in motion will continue in motion at constant velocity.
State Newton’s Second Law of Motion.
The rate of change of momentum of a body is proportional to the resultant force acting on the body, and the momentum change takes place in the direction of the resultant force.
State Newton’s Third Law of Motion.
When body A exerts a force on Body B, body B exerts a force of equal magnitude but opposite in direction on Body A.
Define impulse.
The impulse of a force is the product of the average force and the time during which it acts.
State the Principle of Conservation of Linear Momentum.
When bodies in a system interact, the total momentum remains constant provided no resultant external force acts on the system.
State what is meant by an elastic collision.
An elastic collision is one in which kinetic energy is conserved.
State what happens during a head-on collision.
In a head-on collision, the relative speed of approach before collision is
State what happens during an inelastic collision.
An inelastic collision is one in which kinetic energy is not conserved.
