Topic 2 Mechanics

Question 0

Speed

Answer 0

Is the rate of change of distance

Question 1

Displacement

Answer 1

The distance moved in a stayed direction

Question 2

Velocity

Answer 2

Is the rate of change of displacement

Question 3

Acceleration

Answer 3

Is the rate of change of velocity

Question 4

Instantaneous speed/velocity

Answer 4

Is the rate of change of distance/displacement with time at one particular time

Question 5

Average speed/velocity

Answer 5

Change in distance/displacement divided by time taken over a period of time

Question 6

Newtons 1st law

Answer 6

An object continues in uniform motion in a straight line or at rest unless a resultant external force acts

Question 7

Newtons 2nd law

Answer 7

Force = Mass x Acceleration = the rate of change of momentum (delta p/delta t)

Question 8

Newtons 3rd law

Answer 8

If a body A exerts a force on body B, then body B exerts an equal but opposite force on body A

Question 9

Equilibrium

Answer 9

Is no resultant force in any direction (translational equilibrium)

Question 10

Linear momentum

Answer 10

Is the mass of an object multiplied by it’s velocity

Question 11

Impulse

Answer 11

Is the force multiplied by time or change of momentum.

Question 12

The law of conservation of linear momentum

Answer 12

In an isolate system, momentum remains constant

Question 13

Work

Answer 13

=force x distance moved in the direction of the force

Question 14

Kinetic energy

Answer 14

Is the energy a body possess by virtue of its motion

Question 15

The principle of conservation of energy

Answer 15

Says that energy cannot be made or destroyed, only changed (transformed) from one form to another

Question 16

Inelastic collison

Answer 16

Is when there is a change in kinetic energy

Question 17

Elastic collision

Answer 17

Is when there is no change of kinetic energy

Question 18

Power

Answer 18

Is the rate at which energy is transferred (or the rate at which work is done).

Question 19

Efficiency

Answer 19

Is the ratio of useful energy to the energy transferee (useful energy out/energy put in).

Question 20

Centripetal acceleration

Answer 20

(Speed)^2/radius