Forces and Motion

What is the equation for speed?

Speed = distance/ time

(distance divided by time)

What are some of the many different kinds of forces?

- Push and Pull

- Magnetism

- Air resistence

- Up thrust

- Friction

-Gravity

What is the definition of a force?

A force is something which acts either in contact or at a distance, and results in a change in shape, speedor direction

What is gravity on earth?

10

And on the moon?

1.6

Forces can change 3 things, what are they?

-Direction

- Speed

- Shape

What is the equation for velocity?

Its the same as speed! So its speed = distance/time

What is the equation for acceleration?

Accerelation = change in velocity/ time taken

If a bag of potatos weighed 5kg, how much would it weigh on earth where gravity is 10N/kg

50N/kg

What is the equation linking force, mass and acceleration?

Force = mass x acceleration

What is the equation linking weight, mass and gravity?

Weight = mass x gravity

What is terminal velocity?

Terminal velocity is when both forces acting on the object are balanced.

What is the equation for stopping  distance?

Stopping distance = thinking distance + braking distance

What are some of the things that affect the thinking distance?

Drinking

Texting

Drugs

Nightime

Age of driver

What are some of the things that affect braking distance?

- Tire type

- Road conditions

- Quality of brakes

- Weather conditions

- Mass of car

How long does it take a swimmer in the 200m freestyle if she can swim at 5m/s

200 divided by 5 = 40 seconds

What is the equation to match Hooke's law?

Force is proportional to extension

K = F divided X

Why does a rubber not apply to Hooke's law?

Because Hooke's law only works with materials where stress is proportional to strain but rubber is not one of those materials

What is a moment of a force?

A moment is the turning effect of a force.

How is moment calculated?

Moment (Nm) = Force (N) x distance from pivot (m)

What is the equation for working out the orbital radius?

2 x pi x orbital speed/Time period

What is the order of the planets?

- Mercury

- Venus

- Earth

- Mars

- Jupiter

- Saturn

- Uranus

- Neptune

What is the difference between the orbits in comits, moons and planets?

- Comets and planets orbit the sun whilst moons are natural objects that orbit a planet.

- The earth takes 365 days to orbit but only takes 29.5 days for the moon to orbit the earth.

What are asteroids?

Asteroids are minor planets or rocks that orbit the sun

What is an satellite?

Satellites are objects that orbit a planet and are held in orbit by gravatational forces.

What is the milky way?

The Milky Way is an enormus amount of stars clustered together into a group called a galaxy. The Milky Way is described as a spiral galaxy.