Force of Friction

Why do we slip on a banana when we step on it?

When you step on a banana peel lying on the road, you may slip and fall. This is because

Which of these cause more friction, a carpet or a granite surface? Why?

Can you tell how are these shoes different?

The students of class IV were very excited. They had moved into a brand-new classroom. The walls were clean and the floor was smooth and glossy. During break time, students started running around the class. Reva asked her friend, Dia, not to run as the floor was slippery. But Dia ran, slipped, fell, and hurt her foot. What would have you done if you were in Dia's place?

Unscramble the following word to make a meaningful word:
TRFICINO.    

Friction is the only reason for the loss of energy.

A moving body comes to rest due to friction alone.

_____ (Frictional/ Magnetic/ Elastic) force is the force that opposes motion.

 How many types of forces are there? Give example of each.

The force acting between contact surfaces in planes is _____ force. 

 Frictional force depends on-

Choose the right word from the given options:

_____ (Friction / Gravitation) is caused when two objects rub against each other.

Step 1: Cut one butterfly of the card paper. Cut the straw into two pieces. Fix them with the help of the adhesive tape at an angle on each of the wing of the butterfly as shown.

Step 2: Take a long length of a string that you can loop over a hook in the wall or a curtain rod. Pass the free ends of the thread through both the straw pieces and tie it up as shown so that when loose, the butterfly does not slip out.

Step 3: Hold both the ends of the string and pull alternately.

What will happen if the straw is kept parallel to one another instead of at an angle? Find out.

Step:1 Cut one butterfly of the card paper. Cut the straw into two pieces. Fix them with the help of the adhesive tape at an angle on each of the wing of the butterfly as shown.

Step:2 Take a long length of a string that you can loop over a hook in the wall or a curtain rod. Pass the free ends of the thread through both the straw pieces and tie it up as shown so that when loose, the butterfly does not slip out.

Step: 3 Hold both the ends of the string and pull alternately.

What happens when you pull the strings?

Answer the following by using the options:

The surface on which more friction is seen. (smooth/rough)

_____ force always opposes motion.

Pencils become smaller with use because 

Friction between a pen and paper helps us to write.

Which is easy to drag – a heavy bag or a light bag?