# Mechanics equations Flashcards Preview

## Mathematics (Edexcel) A-Level > Mechanics equations > Flashcards

Flashcards in Mechanics equations Deck (19)
1
Q

What can suvat equations be used for?

A

For linking multiple variables together in moving particles with a constant acceleration

2
Q

What equations can you use to work out velocity (v)?

A

v = u + at
v^2 = u^2 + 2as

3
Q

What equation can you use to work out distance (s)?

A

s = ut + 1/2 at^2
s = vt - 1/2 at^2
s = (u+v)t /2

4
Q

What is the equation linking distance, speed and time?

A

speed = distance / time

5
Q

What is the equation linking displacement, time and average velocity

A

average velocity = displacement / time

6
Q

On a velocity time graph, what does it mean when the velocity is below the time line?

A

The object is moving in the opposite direction/ heading back to starting point

7
Q

How do you work out displacement from a velocity-time graph?

A

By finding the area under the graph

8
Q

How is constant acceleration drawn on a velocity time graph?

A

A straight line with a constant gradient

9
Q

What is the value given to acceleration due to gravity?

A

9.8 ms^-2

10
Q

When an object moves upwards, what is the value for gravitational acceleration?

A

-9.8 ms^-2

11
Q

What is weight represented as?

A

W = mg
(W = mass x 9.8)

12
Q

What direction does friction act in?

A

The opposite direction to what the particle is moving in

13
Q

What is the equation friction?

A

Fr = mew x reaction
(friction = coefficient of friction x reaction)

14
Q

What is newtons first law?

A

That every object remains at rest or moves with constant velocity unless an external force is applied

15
Q

What is newtons second law?

A

The resultant forces acting on an object are equal to the acceleration of the object multiplied by its mass
(F = ma)

16
Q

What is newtons third law?

A

If an object exerts a force onto another object, an equal force must be exerted back

17
Q

How do you get from an equation of displacement to velocity then to an equation of acceleration?

A

Differentiate the equation from distance to velocity, then once again to an acceleration equation

18
Q

How do you get from an equation of acceleration to velocity and displacement?

A

Integrate the acceleration equation into a velocity equation then again into a displacement equation

19
Q

What does it mean to have a uniform rod?

A

Where the centre of mass is at the midpoint of the rod