• A force never acts alone. Force always exists in pairs. This pair of forces act in oppos
Whenever one of the forces is greater than the other, there is a motion.
• Frictional force acts in the opposite direction of motion.
To move an object the applied force must unbalance its frictional force
To accelerates the motion of an object an unbalanced force is required.
1
• An unbalanced force acting on an object brings it in motion
Check yourself
Q 1. What effect can be produced by force? Give example.
Q2. What is the direction of frictional force?
Q3. Is it really necessary to apply force to make a body to move? Think and write your views.
Q 4. A ball rolled down on a floor and another on a carpet at same time, which ball
comes to rest first? Give reason.
Q 5. In the given picture, what does two arrows (A and B) represent with reference to force.
Answers
Explanation:
Ans1. A force tends to change the position,direction, sometimes it can stop the body or it can change the speed of the body by pushing it or pulling the body. For example- we opens the door by pushing it, it makes the door change its position.
Ans2. Frictional force always acts opposite to the direction of the motion of any object.
Ans3. Yes, it is obviously necessary to apply force to make the body move.
Ans4. The ball which has been rolled on a carpet will come to rest first in comparison to the floor one. This is bcoz on the carpet interlocking capacity of molecules of that ball and the carpet will be more than floor as carpet is more rough than floor.
Ans5. Dear you've missed to attach the pic....
Hope u got it...thanks if u like.
Answer:
Q1. It can make an object move. Ex: kicking a ball, it can stop an moving object. Ex: catching a ball, it can change the speed of an moving object. Ex: increasing the speed of a cycle, it can change the direction of an moving object. Ex: a ball being hit in the opposite direction, it can change the shape or size of an moving object. Ex: squeezing a lemon.
Q2. It is parallel to the plane of interface between objects
Q3. Yes, a force must be applied to make a body move.
Q4. The ball on the carpet come to rest first, because the friction is more due to the rough surface of the carpet.