forces and motion Flashcards
what is a distance time graph
It shows how far and object has traveled in a certain amount of time
what does a low straight line mean on a speed time graph mean
constant speed slow
what does a line going down mean on a speed time graph
decceleration
what does a high straight line mean on a distance time graph
constant speed fast
what does a line going up meanon a speed time graph
accleration
what is the number you convert km/hr to m/s
3.6
how to calculate a gradient on a distance time graph
run
what is newtons first law of motion
An object at rest remains at rest, and an object in motion remains in motion at constant speed and in a straight line unless acted on by an unbalanced force.
what is newtons 2nd law of motion
F = ma, or net force is equal to mass times acceleration.
what is newtons 3rd law of motion
for every action (force) in nature there is an equal and opposite reaction.
How do you acclerate
you change your speed, dircetion or both.
what is a contact force
- fricton
- air and water resistance
- force from wall
- force from machine and muscles
what is a non contact force
- gravitonal forces
- electostatic forces
- magnetic forces
what is mass
how much matter is in an object. Measured in kgs
what is weight
how much force is in a object. Measured in newtons
what is magnitude
how large the force is in newtons
what is dircetion
which way the force is acting
what is the law of conservation of energy
energy that cant be destoryed or made but can be transformed into othe forms of energy
what is work
the amount of energy used to move an object measured in joules or kjs
what is power
rate a which work is done measured in watts or joules per second
