Evs Revision Force

QI.Fill in the blanks:-

a. We can move objects either by push or by pull .

b. We need more force to move a heavy object.

c. Objects that are light need less  force to move.

d. We use force to change the direction of a moving object.

e. Force is used to stop the motion of an object.

f. We cannot see force , but we can see and feel its effect on things.

g. Air and water can make things move because they can exert force.

h. Force can be exerted by  object even at rest .

QII Answer the following question:-

Q1. What is force?

Ans:A push or a pull is called force.

Q2.Why an object floating on water move a little on its own?

Ans:Object floating on water move a little on its own because water possesses force.

Q3. Explain water has force.

Ans: A boat floats on the water because water gives a vertical force to the boat.

Q4.How do kites fly in the air?

Ans:Kites fly in the air because air has force.

Q5.How do you know that we apply force while writing?

Ans:We know that we have applied force because we could see the effect.

Q6. Why do objects thrown in the air fall to the ground?

Ans:Due to the special force called gravity that the Earth possesses.

Q7. Why do we need energy?

Ans: We need energy to do work.

Q8. Adi is playing a game of carrom. How can Adi use force to reach the coin to the pocket?

Ans; Adi will push the  stricker towards the coin , which in turn will be pushed in the pocket.

Q9.Differentiate between a push and pull.

Ans:

	Push	Pull
1.	When we apply force to move the object far from us then that force is known as push.	1.When force is applied to bring the object near us then that force is called pull.
2.	Eg.Moving table from one place to another.	2.Eg.Opening a lunch box

Q10.Explain the effect of force.

Ans:

	Effect of force	Examples
1.	Force can increase the speed of an object.	Eg.Pedalling a bicycle can increase its speed .
2.	It can change direction of the object.	Eg. A bat hitting a ball can change its direction.
3.	It can slow down or stop the motion.	Eg.Brakes applied in a moving cycle can slow down or stop completely.
4.	It can change the shape of an object.	Eg.A small dough can make a big chappati by applying force.

Q11. What happens to the pile of books when we push it?

Ans: It moves from one place to the other.

Q12. What happens to the moving toy car when you hold it with your hand?

Ans:It stops.