Question 1 Define the term force?
Question 2 Define the term direction of force?
Question 3 What are the various effects of force?
Question 4 Give an example where a force stops a moving body?
Question 5 Give an example where a force changes the shape of a body?
Question 6 What do you understand by balanced forces. Give example?
Question 7 What do you understand by unbalanced forces. Give example?
Force and Law of motion
A push or pull on a body is called force.
Effects of Force
Types of forces
1) Balanced Force
2) Unbalanced Force
Unbalanced forces acting on a body can change its speed or direction of motion.
For Example : A toy car lying on a ground. The forces acting on it are: 1)Force of friction 2)Force of gravity(weight of toy car) 3)Force of reaction(exerted by ground) 4)Force of our push
Force of reaction=Force of gravity(balanced)
Force of push > Force of friction(unbalanced)
Resultant of all forces acting on toy car is not zero.
For Example: In a tug of war, if one of the team suddenly releases the rope, an unbalanced force acts on other team due to which it falls backwards.
An unbalanced force can stop a moving body.
For Example: When a ball is rolling on ground, an unbalanced force of friction acts on it which brings the ball to stop after sometime. If the speed or direction of motion of body changes the some balanced force is acting on it. When we stop pedalling a moving bicycle, it slow downs due to unbalanced forces of friction acting on it. The force of friction opposes the motion of bicycle.