Forces and motion

Forces and motion

What is Newton’s second law?

↳ An object will accelerate (change its velocity) in response to a resultant force

↳ Big resultant force = big acceleration

What is terminal velocity?

↳ the constant velocity a falling object reaches when friction is equal to it’s weight

What is terminal velocity for an object falling through a fluid?

↳ Weight remains constant

↳ Drag us small at the start but get’s bigger as it speeds up

↳ The resultant force will get smaller as the drag force increases

↳ Acceleration will decrease as it falls

↳ The object will reach a final steady speed if it falls for a long time

What is momentum?

↳

What are some factors that affect breaking distance?

↳ Speed of the car

↳ Road conditions (snowy/wet)

↳ Conditions of brakes

↳ Conditions of tyres

What are some factors that affect thinking distance?

↳ Tiredness

↳ Drugs

↳ Alcohol

↳ Distractions (music)

What is deformation?

↳ A temorary change in a shape of an object caused by strechting,compressing ext

↳ Eg- spring strectched

What is elastic deformation?

↳ An object can go back to it’s original shape once forces are removed

What is inelastic deformation?

↳ The object does not go back to it’s orignial shape/size once the forces are removed

↳ Eg- spring doesn’t return to natural shape

What is the limit of proportionality?

↳ Point where the object no longer obeys Hooke’s law (the force required to stretch or compress a spring is proportional to the distance the spring is stretched)