Force
Questions 1-2: Push and Pull
1. Give two examples each of situations where you push or pull to change the state of motion of objects.
Push: Closing a drawer, moving a wooden box.
Pull: Drawing water from a well, a horse pulling a cart.
2. Give two examples where applied force causes a change in shape.
Applying force on a rubber band to stretch it.
Applying force on clay to change its shape.
Forces and Their Types
Question 3: Fill in the Blanks
To draw water from a well, we have to pull at the rope.
A charged body attracts an uncharged body towards it.
To move a loaded trolley, we have to push it.
The north pole of a magnet repels the north pole of another magnet.Force and Motion
Question 4: Archer Stretching Bow
To stretch the bow, the archer applies a force that causes a change in its shape.
The force applied by the archer is an example of muscular force.
The type of force responsible for the change in motion of the arrow is a contact force.
Forces acting on the arrow are due to gravity and friction of air.
Experiments
Experiment 1: Ball on a Level Surface
When a ball is pushed gently on a level surface, it begins to move.
When pushed again while moving, its speed increases.
When palm is placed in front of the moving ball, its speed decreases.
Experiment 2: Ball and Ruler
When a ruler is placed in the path of a moving ball, the ball changes direction after striking the ruler.
This shows that force can chang
Experiment 3: Magnetism
When unlike poles of two magnets are brought near each other, they attract.
When like poles are brought near each other, they repel.
This shows that magnetic force is a type of non-contact force.
Experiment 4:
Electrostatic Force
When a straw is rubbed with paper, it attracts another straw.
If both straws are rubbed with paper, they repel each other.
This shows that electrostatic force can act between charged bodies.
Pressure
Experiment 5:
Pressure Exerted by Liquids
When water is poured into a bottle with holes at the same height, water streams out at the same distance.
This shows that liquids exert equal p
Experiment 6: Atmospheric Pressure
When a rubber sucker is pressed on a smooth surface, it sticks due to atmospheric pressure.
To pull the sucker off, a large force is required to overcome atmospheric pressure 1.ressure at the same depth.e the direction of motion.
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