Contact Forces
Contact Forces: Overview
This topic covers concepts, such as, Contact Forces, Muscular Forces & Friction Force etc.
Important Questions on Contact Forces
Look at the toy cycles and the surfaces below.
1. Coal tar
The cycle travels 10 cm
2. Grass
The cycle travels 5 cm
3. Ice
The cycle travels 20 cm
Now, arrange the surfaces in increasing the order of friction they cause. Give reasons for your answer.
When cars drive on icy roads, the friction between the car and the road is reduced. If the friction was reduced to zero, which statement describes the motion of the car along a flat icy road?
If there were no friction, what would happen to a moving object?
Unscramble the following word to make a meaningful word:
OCNTTAC.
Which of the following games need strong muscular force?
In which of the given situation, a frictional force will occur between two surfaces?
Which of the following force is responsible for the decrease in the speed of a moving ball, without anybody touching it?
Which of the following forces is/are types of contact forces?
The force resulting due to the action of muscles is known as the _____ force.
_____ (Frictional/ Magnetic/ Elastic) force is the force that opposes motion.
When a moving object rubs against something, its motion slows down because of a force called _____.
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 force is helping the butterfly climb upwards?
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 at the point where the string touches the straw? Why does it not slip down when the string is held tightly?
Can you name the type of force acting on the following?
Explain two advantages and two disadvantages of the force of friction.
What do you mean by the term contact force?
