Question

When we tie a stone to a string and suspend it ,the tension in the string opposes
the force of gravity of the earth and keeps the stone from falling down. When we
do work with our hands, such as lifting a weight, or pulling an object, the force
required is provided by the tension of our muscles. When we need to apply a
force, the brain sends a signal to the muscle which makes the muscle contract.
This is how we can apply a force with our hands and legs.
a) Name any two contact forces.
b) Write the SI unit of force.
c) Write any two effects of force.​

Answer 1

Answer:

(a) Reaction force, Tension

(b) Newton

(c) (i) it can change the state of movement of the body on on which force is applied.

(ii) It can change the shape and size of the object.