Energy and Springs

Energy Measurement

Joules (J)

Work

the energy transformed when a force produces a movement

Energy of a stationary object

0

Kinetic Energy Formula

KE=MV²/2

Mass of Object Measurement

KG

Velocity measurement

m/s

Work Formula

W=FD

Force Applied Unit

Newtons (N)

Distance Unit

Meters (M)

F+D need to be parallel to each other to work

F+D need to be parallel to each other to work

When doing physics you round to

2 Decimal Places

T and G pull a car up a 15m hill. Total work was 405J How large was the force

27N

S exerts a force of 4.5. IF she does 2.7J of work how far has phone moved

0.6m

K is being moved with a force of 2470N foce and 3640J of work is done how far is he being lifted

1.48m

A 250g car has 8J of Kinetic energy what is its velocity

KE= 0.250 x v²

2m/s

An object with a velocity of 4m/s has 5000j of kinetic energy. what is mass of object

KE=1/2mv²

10000/16=m
m=625kg

A 3kg mass moves at 6m/s. What is kinetic energy of object

KE = ½mv²
KE= 3²x6
54J

Kinetic Energy

the energy an object has because it is moving

GPE Formula

GPE=mgh

Earths Gravity

9.8m/s²

Calculate GPE of a 3000kg Car that is lifted 20m above ground

GPE=mgh GPE= 3000 × 9.8 × 20 

GPE= 588000J

Explain why GPE increased when object is higher

because GPE and height are proportional to each other, as the object is further away against from the center of earth and against force of gravity, resulting in more potential energy

Mass of object that has 345J of GPE when lifted 12m above ground

(345/9.8×12) M=2.93kg

EPE Formula

(1/2)kx²

Force Formula

F=MG

Hookes Law

F=kx

A spring is stretched 2cm when a mass of 40 grams i hung from it. What is the spring constant of the spring

F=(0.04×9.8)/0.02 K=19.6N/m

Spring Constant on a graph

Rise/Run

what to do if weight is given in newtons

solve without gravity as it is already factored in