Chapter 2 Kinematics + Chapter 3 Dynamics Flashcards
(18 cards)
Displacement
Displacement of an object is its distance from a fixed point in a specific direction
Velocity
The velocity of the body is defined as the rate of change of its displacement
Acceleration
The acceleration of a body is defined as the rate of change of its velocity
Mass
Mass is the property of a body which resists change in motion
Momentum
The linear momentum of the body is defined as the product of its mass and its velocity
Force
A force is a push-up pool that can cause a change in momentum to a body when acting on it
The resultant force acting on the body is proportional to the rate of change of momentum of the body
Newton’s first law of motion
In the absence of 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
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
Impulse
An impossible force is the product of the average force and the time during which it acts hello
Car safety features
1 - Front and rear crumble zones:
The metal of the car will then Ben and for during a collision which increases the amount of time it takes for the car to stop
2 - Seat belts:
Seat belt prevents the person being thrown about in the car.
Seat belt also stretch just a little while restraining the person during a crash which increases the amount of time it takes for the person to stop.
3 - Airbags:
Apex inflate very quickly doing a crash providing a softer surface to prevent the people hitting themselves on hard objects
And epic will give you a little when a person hits it which gives extra increase to the amount of time it takes for the person to stop
Newton 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
Apparent weight
Apparent weight is the force exerted on the object by the body freely supporting it
Principle of conservation of linear momentum
When bodies and a system interact the total momentum remains constant provided no resultant external force acts on the system
Head on collision
In a head on collision, the velocity vectors of colliding bodies before and after the collision are along the line joining their centers of mass
Elastic collision
Elastic collision is one where kinetic energy is conserved
Inelastic collision
And inelastic collision is one in which kinetic energy is not conserved
Completely inelastic collision
A completely inelastic collision is one with the body’s joined together after colliding more
Superelastic collision
Kinetic energy is gained
