Unit - 2 Force and Motion

 Unit - 2

Force and Motion

Summary

1. The external force that pulls or drags is called force.

2. A force causes motion in a stationary object and stops an object in motion.

3. A force causes an object to accelerate.

4. A force changes the volume of an object.

5. A force changes the shape of an object.

6. Force is measured in Newton units.

7. When an object changes from one place to another, that object is in motion.

8. Movement of objects is of different types, viz

  (a) Translational motion (b) Circular motion

  (c) Oscillatory motion (d) Random motion

1. Fill in the blank

👉 (a) The motion of a falling piece of paper is called free fall.

👉 (b) The state in which the object is changing its position is called motion.

👉 (c) The reason why a stone thrown from above falls towards the ground is gravity.

👉 (d) To change the shape of an object, force is required.

2. Choose one correct answer from the given answers

(a) What is the change in motion of any object called? 

👉 Acceleration

(b) Which force does pull only? 

👉 Gravitational force

(c) What work does the force do? 

Changing the motion of an object

(d) What type of move is played while playing Rotaping? 

👉 Circular

3. Write the answers to the following questions

(a) Definition of Force Article.

👉 Force is an interaction between two or more objects that causes a change in the motion of the objects. Forces can be classified into two types: contact forces and non-contact forces. Contact forces are forces that act when two objects are in contact with each other. Non-contact forces are forces that act even when the objects are not in contact with each other.

(b) Write any three effects of force on an object.

👉 The three effects of force on an object are:

• Acceleration: Force can cause an object to accelerate, which means that the object's velocity changes.
• Deformation: Force can cause an object to deform, which means that the object's shape changes.
• Rotation: Force can cause an object to rotate, which means that the object's axis of rotation changes.

(c) How can it be shown that the volume of solid matter does not change? Don't do that.

👉 The volume of solid matter does not change because the atoms in a solid are packed tightly together. When a solid is compressed, the atoms are forced closer together, but the volume of the solid does not change.

(d) What should be done to increase the speed of the moving bicycle?

👉 To increase the speed of the moving bicycle, you can:

• Pedal harder.
• Change to a lower gear.
• Lean forward.
• Use your brakes to slow down before you start pedaling again.

(e) What is oscillatory motion?

👉 Oscillatory motion is a type of motion in which an object moves back and forth or up and down about a fixed point. Some examples of oscillatory motion include:

• A swing.
• A pendulum.
• A tuning fork.

(f) What is the movement of the kite when the thread breaks while flying the kite?

👉 When the thread breaks while flying the kite, the kite will continue to move in the direction of the wind. This is because the kite is still being acted upon by the force of the wind.

(g) What is circular motion? Article with an example.

👉 Circular motion is a type of motion in which an object moves in a circle around a fixed point. Some examples of circular motion include:

• The Earth orbits the Sun.
• A car goes around a curve.
• A merry-go-round spins.