forces - resultant forces

Question 1

what is the resultant force?

Answer 1

a single force that has the same effect as all of the original forces acting together

Question 2

how do we work out resultant force from a simple scenario?

Answer 2

substract smaller force from larger force

Question 3

how do we work out resultant force?
driving force <- 10000N
air resistance 5000N
friction force -> 4000N

Answer 3

1. find total force acting to the right. add together friction + air resistance = 9000N
2. substract 9000N from driving force acting to= 1000N to the left

Question 4

skydiver
800N down (weight)
air resistance 800N

what is the resultant force?

Answer 4

it is balanced so no resultant force that has

Question 5

what is an object shown as in a free body diagram?

Answer 5

a point. forces drawn as arrows starting at point

Question 6

what does altitude mean?

Answer 6

height above the ground

Question 7

what does it mean if at a constant altitude in an aeroplane?

Answer 7

must be a force with same altitude as weight in opposite direction. this is called lift.

Question 8

what force does aeroplane experience from engines? what is the opposite

Answer 8

forward force called thrust. opposite force is air resistance (drag) in reverse direction

Question 9

what must be balanced if aeroplane moving at a constant velocity?

Answer 9

forward and backwards forces ( see by length of arrows)