forces and motion Flashcards
how do you convert m/s into km/s
Multiply by 3.6 (other way for km/s to m/s)
How do you calculate speed
speed=distance/time
average speed
total distance/total time
how do you calculate gradient
gradient=rise(distnace)/run(time)
what is velocity
velocity is a speed and direction
what is acceleration
accelertaion is any process where the velocity changes
how to calculate accelreation
acceleration=change in speed (in m/s)/time taken (in s)
what is a force
a force is a push, pull or twist
list some contact forces
- friction
- air and water resistance
- force from water
-force from machines/muscles
list some non-contact forces
- gravitational forces
- electrostatic forces
- magnetic forces
what is Newtons third law of motion
for every action (force) in nature there is an equal and opposite reaction.
what is force measure in
force is measured in newtons (N) using a force meter
what is mass measure in?
mass is measure in kg
what is mass
how much matter is in an object
what is weight
hiow much force is exerted on an object by gravity
what is weight measured in
weight is measured in Newtons (N)
how to calculate weight
weight=mass x gravity
(N) (kg) (n/kg)
what is gravity on earth
10
what is magnitude
how large the force is (newtons)
what is direction
which way the force is acting
what is the law of conservation of energy?
- energy come in different forms
- energy cannot be created or destroyed
- energy can be changed into other forms of energy
how to calculate force
force = mass x acceleration
what is work measured in
measures in joules (J) or kilojoules (kj)
what is energy used for
required to make things move or change
what is energy measure in
measure is joules (J) or kilojoules (kj)
what is energy active forms
- heat
-kinetic
-light
-sound
-electric - electro magnetic
potential forms of energy
- chemical potential energy
- gravity potential energy
- magnetic potential energy
- nuclear potential energy
- elastic potential energy
- mechanical potential energy
what is work
work is amount of energy used to move and object
what is power measured in
measured in watts (W) or joules per second (J/s)
how do you calculate work
work = force x distance
what is power
rate at which work is done
