Mechanics equations

Question 1

What can suvat equations be used for?

Answer 1

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

Question 2

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

Answer 2

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

Question 3

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

Answer 3

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

Question 4

What is the equation linking distance, speed and time?

Answer 4

speed = distance / time

Question 5

What is the equation linking displacement, time and average velocity

Answer 5

average velocity = displacement / time

Question 6

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

Answer 6

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

Question 7

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

Answer 7

By finding the area under the graph

Question 8

How is constant acceleration drawn on a velocity time graph?

Answer 8

A straight line with a constant gradient

Question 9

What is the value given to acceleration due to gravity?

Answer 9

9.8 ms^-2

Question 10

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

Answer 10

-9.8 ms^-2

Question 11

What is weight represented as?

Answer 11

W = mg
(W = mass x 9.8)

Question 12

What direction does friction act in?

Answer 12

The opposite direction to what the particle is moving in

Question 13

What is the equation friction?

Answer 13

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

Question 14

What is newtons first law?

Answer 14

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

Question 15

What is newtons second law?

Answer 15

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

Question 16

What is newtons third law?

Answer 16

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

Question 17

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

Answer 17

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

Question 18

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

Answer 18

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

Question 19

What does it mean to have a uniform rod?

Answer 19

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