# Shared Flashcard Set

## Details

Tara and Lucy's Flashcards
IGCSE Revision - Forces and Motion
27
Physics
12/23/2015

Term
 Forces and Motion
Definition
Term
 What is the equation for speed?
Definition
 Speed = distance/ time (distance divided by time)
Term
 What are some of the many different kinds of forces?
Definition
 - Push and Pull - Magnetism - Air resistence - Up thrust - Friction -Gravity
Term
 What is the definition of a force?
Definition
 A force is something which acts either in contact or at a distance, and results in a change in shape, speedor direction
Term
 What is gravity on earth?
Definition
 10
Term
 And on the moon?
Definition
 1.6
Term
 Forces can change 3 things, what are they?
Definition
 -Direction - Speed - Shape
Term
 What is the equation for velocity?
Definition
 Its the same as speed! So its speed = distance/time
Term
 What is the equation for acceleration?
Definition
 Accerelation = change in velocity/ time taken
Term
 If a bag of potatos weighed 5kg, how much would it weigh on earth where gravity is 10N/kg
Definition
 50N/kg
Term
 What is the equation linking force, mass and acceleration?
Definition
 Force = mass x acceleration
Term
 What is the equation linking weight, mass and gravity?
Definition
 Weight = mass x gravity
Term
 What is terminal velocity?
Definition
 Terminal velocity is when both forces acting on the object are balanced.
Term
 What is the equation for stopping  distance?
Definition
 Stopping distance = thinking distance + braking distance
Term
 What are some of the things that affect the thinking distance?
Definition
 Drinking Texting Drugs Nightime Age of driver
Term
 What are some of the things that affect braking distance?
Definition
 - Tire type - Road conditions - Quality of brakes - Weather conditions - Mass of car
Term
 How long does it take a swimmer in the 200m freestyle if she can swim at 5m/s
Definition
 200 divided by 5 = 40 seconds
Term
 What is the equation to match Hooke's law?
Definition
 Force is proportional to extension K = F divided X
Term
 Why does a rubber not apply to Hooke's law?
Definition
 Because Hooke's law only works with materials where stress is proportional to strain but rubber is not one of those materials
Term
 What is a moment of a force?
Definition
 A moment is the turning effect of a force.
Term
 How is moment calculated?
Definition
 Moment (Nm) = Force (N) x distance from pivot (m)
Term
 What is the equation for working out the orbital radius?
Definition
 2 x pi x orbital speed/Time period
Term
 What is the order of the planets?
Definition
 - Mercury - Venus - Earth - Mars - Jupiter - Saturn - Uranus - Neptune
Term
 What is the difference between the orbits in comits, moons and planets?
Definition
 - 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.
Term
 What are asteroids?
Definition
 Asteroids are minor planets or rocks that orbit the sun
Term
 What is an satellite?
Definition
 Satellites are objects that orbit a planet and are held in orbit by gravatational forces.
Term
 What is the milky way?
Definition
 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.
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