Year 10 Physics - Motion

define motion

the continuous change in the postition of an object in relation to another object which is regarded to be at rest

define mechanics

a branch of physics which studies the motion of objects

define scalar quantities

a quantity accurately described by a number, with approprtiate units, that has only magnitude

define vector quantities

quantities fully described with direction and magnitude

examples of scalar quantities

age, time, area, work, distance, speed and mass

examples of vector quantities

force, displacement, velocity and acceleration

define distance

a scalar quantity that refers to how much ground an object has covered during it's motion. it has magnitude but no direction.

define displacement

a vector quantity which refers to how far out of place an object is in consideration of the straight line distance covered and the position of the object from its' original position. has both direction and magnitude.

what is the formula for distance (m)

average soeed (m/s) x time (s)

what is the formula for average speed (m/s)

distance (m) / time (s)

what is the formula for time

distance (m)/ average speed (m/s)

how do you convert m/s to km/h

multiply by 3.6

how do you convert km/h to m/s

divide by 3.6

how do you write graphical displacement

distance - first direction - angle - second direction

how do you find displacement distance using trigonometry

use pythagoras (a2 + b2 = c2)

how do you find the angle of displacement using trigonometry

use sine, cosine or tangent rules to find the angle. e.g tan θ = opposite/ adjacent, and then plug in values to find θ and then plug in values to find θ

what is a bearing

an angle to an object clockwise from north

how do you write a bearing

with 3 figures e.g 90* = 090* or 230* = 230*

how do you measure a bearing

with a protractor

what is velocity

the displacement of an object per a unit of given time. It is a vector quantity, having both direction and magnitude.

formula for velocity

v = s/t

formula for displacement

s=txv

formula for time

t=s/v

what do the letters represent in the velocity formula

v = velocity, t = time, s = displacement

hwo do you write velocity

speed, unit, direction

what does a motion graph show

the motion of an object (distance and time)

on a motion graph what does each axis represent

y - axis = distance and x - axis = time

what does a flat line on a motion graph mean

no movement

what does a steeper gradient on a motion graph mean

higher speed

what does a slowly increasing curve mean on a maotion graph

gradual accelaration

what does it mean when the line on a motion graph goes down

the object travels closer towards it's starting position

what does a straight line on a motion graph mean

steady speed

how do you read speed on a motion graph

distance/time

how to go from km/h to km/min

divide by 60

how to go from km.min to km/s

divide by 60

how to go from m/s to m/min

multiply by 60

how to go from m/min to m/h

multiply by 60

m/s to cm/s

multiply by 100

m/s to km/s

divide by 1000