2.mechanics

Question 1

What is mechanics

Answer 1

How forces moves things

Question 2

Newton’s first law

Answer 2

An object remains at rest or in uniform motion unless a resultant force acts on it

Question 3

Newton’s second law

Answer 3

Resultant force is equal to the rate of change of momentum
F=ma

Question 4

Newton’s third law

Answer 4

If object an exerts a force on object B, object B exerts a force on object A.
-forces are same type
-the forces the same size
-act in opposite directions

Question 5

Details of free body force diagram (FBFD)

Answer 5

-show all forces acting on an object
-forces act from centre of the object
-arrows show the direction of the force

Question 6

What is velocity

Answer 6

Rate of change of displacement

Question 7

Velocity equation

Answer 7

Velocity =displacement/distance divided by time

Question 8

Scalar

Answer 8

Magnitude only

Question 9

Vector

Answer 9

Direction and magnitude

Question 10

Acceleration equation

Answer 10

Acceleration = change in velocity / change in time

Question 11

Magnitude is what

Answer 11

Resultants line

Question 12

Direction is what

Answer 12

Angle

Question 13

what does SUVAT stand for

Answer 13

S=displacement
U=initial velocity
V=final velocity
A=acceleration
T=time

Question 14

Uniformly retarted

Answer 14

Decelerates at a constant rate

Question 15

Free fall

Answer 15

Only gravity nothing else
A=g

Question 16

Newtons 1st law

Answer 16

Object remains at rest or uniform motion unless a resultant force acts on it

Question 17

Newtons 2nd law

Answer 17

Resultant force is equal to the rate of change of momentum

Question 18

Newton third law

Answer 18

If object, a exerts, a force on object, B object, be exerts, a force an object

The forces are the same type
The forces are the same size
Act in opposite directions

Question 19

 centre of gravity

Answer 19

Single point that you can consider that its whole weight to act through 

Question 20

What is the gradient of a displacement time graph?

Answer 20

Velocity

Question 21

Gradient of velocity graph

Answer 21

Acceleration

Question 22

Centre of gravity

Answer 22

The point through which the weight of an object appears to act

Question 23

Principle of moments

Answer 23

Will be in equilibrium if the sum of clockwise moments acting on it is equal to some of anticlockwise moments

Question 24

Equilibrium in a body

Answer 24

Zero resultant force and zero resultant moment it will have zero acceleration

Question 25

Conservation of energy

Answer 25

Energy cannot be created or destroyed only transferred

Question 26

Work

Answer 26

The amount of work done meant the amount of energy transferred over moved in direction of the force

Question 27

Power

Answer 27

Rate of energy transfer

Question 28

Efficiency

Answer 28

Ratio of useful energy over total energy input

Question 29

Momentum

Answer 29

Measure of an object motion

Question 30

Conservation of linear momentum

Answer 30

Vector some of the memento of all objects in a system is the same before and after any interaction or collision between the objects

Question 31

Explosion

Answer 31

Situation in which stationary object joined objects separate into component parts which move off a different velocities. The momentum must be conserved and explosions.