Mechanics

Question 1

What is a Vector?

Answer 1

Has both magnitude and direction?

Question 2

How are vectors represented in diagrams?

Answer 2

Arrows
Length represents magnitude
Direction of arrow head represents direction of vector

Question 3

What does resolving mean?

Answer 3

To split the vector into two perpendicular components

Question 4

What is a component?

Answer 4

Vector x cos(angle between vector and component)

Question 5

How to calculate length of the horizontal?

Answer 5

Fh = vector x cos(theta)

Question 6

How to calculate length of verticle?

Answer 6

Fv = vector x sin(theta)

Question 7

What is a Scalar?

Answer 7

Magnitude Only

No direction

Question 8

When forces are balanced on an object what state is the object in?

Answer 8

It is in equilibrium

Question 9

What two things can happen to an object in EQUILIBRIUM?

Answer 9

It can be stationary or moving in a constant velocity

Question 10

When in equilibrium what is the resultant force on the object?

Answer 10

0

Question 11

What happens to the vertical and horizontal directions in the test for equilibrium?

Answer 11

They will be zero

Question 12

What is the overall effect of vectors called?

Answer 12

Resultant

Question 13

When drawing vector triangles what are we proving?

Answer 13

That the vectors are in equilibrium

Question 14

How do you work out the gradient of a curve?

Answer 14

Draw tangent at specified point on curve

Question 15

What does the gradient of a displacement time graph tell us?

Answer 15

The velocity

Question 16

What does the gradient of a velocity time graph tell us?

Answer 16

The acceleration

Question 17

What does the area under the line in a veloity time graph tell us?

Answer 17

The displacement (distance in certain direction)

Question 18

What does the are under the line in an acceleration time graph tell us?

Answer 18

The change in velocity

Question 19

What is the gradient always (with one exception) in an acceleration time graph?

Answer 19

Gradient is always 0

Question 20

What is the exception for gradients on acceleration time graphs?

Answer 20

The line change from acceleration to negative acceleration

Question 21

How many equations of motions are there?

Answer 21

There are four

Question 22

How many quantities are there for equations of motion?

Answer 22

5

Question 23

What are the quantities for equations of motion?

Answer 23

Displacement
Initial Velocity
Final Velocity
Constant Acceleration
Time

Question 24

What are the symbols for each of the quantities of motion?

Answer 24

Displacement - s
Initial Velocity - u
Final Velocity - v
Constant Acceleration - a
Time - t

Question 25

What are the units for each quantity of motion?

Answer 25

``` Displacement - m Initial Velocity - ms^-1 Final Velocity - ms^-1 Constant Acceleration - ms^-2 Time - s ```

Question 26

What are the four eqautions for graphs of motion?

Answer 26

``` v = u + at s = ut + 0.5at^2 v^2 = u^2 + 2as s = 0.5t(v+u) ```