2- Mechanics Flashcards Preview

MY IB Physics > 2- Mechanics > Flashcards

Flashcards in 2- Mechanics Deck (30)
Loading flashcards...
1
Q

Acceleration (definition)

A

The rate of change of velocity in a particular direction. Vector quantity.

2
Q

Acceleration (equation)

A

a = v/t

3
Q

Angular velocity (definition)

A

The rate of change of angle of an object undergoing uniform circular motion at constant speed

4
Q

Angular velocity (equation)

A

w = ∆θ/∆t

5
Q

Law of conservation of linear momentum

A

The total linear momentum of a system of interacting particles remains constant provided there is no resultant external force (i.e. the system is isolated)

6
Q

Centripetal acceleration (definition)

A

Acceleration of an object moving at constant speed in uniform circular motion. Speed is constant but direction of velocity is changing, so it’s accelerating

7
Q

Centripetal acceleration (equation 1)

A

a = v^2/r

8
Q

Centripetal acceleration (equation 2)

A

a = 4π^2r/T^2

9
Q

Elastic collision

A

Collisions in which no energy is gained or lost, ie. Collisions between atoms and molecules.

10
Q

Energy

A

The work that has been done on a body. Also equal to the amount of work that the body is capable of doing.

11
Q

Gravitational potential energy

A

mg∆h

12
Q

Impulse

A

The resultant force acting on the object times time for which this force acts. It is equal to change of momentum of the object. Vector quantity

13
Q

Impulse (equation)

A

F∆t and m∆v

14
Q

Inelastic collision

A

Collisions in which the objects involved in the collision lose energy (e.g. to thermal energy or to sound). All laboratory collisions are inelastic.

15
Q

Kinetic energy

A

1/2mv^2

16
Q

p = mv

A

Linear momentum

17
Q

Newton’s first law (definition)

A

A body in motion stays in motion unless an external force acts

18
Q

Newton’s second law (equation 1)

A

F = ma

19
Q

Newton’s second law (equation 2)

A

F = ∆p/∆t

20
Q

Newton’s third law (definition)

A

Two interacting bodies exert equal and opposite forces on each other

21
Q

Power (equation)

A

P = ∆W/∆t

22
Q

Power

A

Rate of doing work, which is the same as the rate of transferring energy. Scalar quantity.

23
Q

Translational equilibrium

A

When the resultant force on the object is zero. Object is either at rest or moving with constant (uniform) velocity in a straight line

24
Q

Work

A

Force times component of displacement in direction which force acts

25
Q

Work (equation 1)

A

Force x distance

26
Q

Work (equation 2)

A

W = Fscosθ

27
Q

W = mg

A

Weight

28
Q

Momentum, energy

A

In an elastic collision which out of: momentum, energy, are conserved?

29
Q

Principle of conservation of energy

A

Energy cannot be created or destroyed, it just changes from one type to another

30
Q

Work (equation 3)

A

W = ∆Ek