Question

1. Jo, Daniel and Helen are pulling a metal ring. Jo pulls with a force of 100 N in one
direction and Daniel with a force of 140 N in the opposite direction. If the ring does not
move, what force does Helen exert if she pulls in the same direction as Jo?
2. A boy drags a suitcase along the ground with a force of 100 N. If the frictional force
opposing the motion of the suitcase is 50 N, what is the resultant forward force on the
suitcase?
3. A picture is supported by two vertical strings; if the weight of the picture is 50 N what
is the force exerted by each string?
4. Using a scale of 1 cm to represent 10 N, find the size and direction of the resultant of
forces of 30 N and 40 N acting at right angles to each other.

Answer 1

Answer:

answer no. 1 she is pulling with 40 N force

Answer 2

Answer:

No. 2.   50N

Explanation:

Force is a vector, so if you know the strength and direction of each force you will be able to add them and find the resultant force.

When talking in vectors one newton forward is the negative of one newton backwards.

100N forward + 50N backwards = 100N forward - 50N backwards

Therefore the resultant forward force = 50N