Let Us Know Force

1. Why does a moving object on Earth eventually stop, even though Newton's first law suggests it should continue moving perpetually?

• A) The object's internal energy runs out
• B) The initial force applied to it diminishes over time
• C) The law only applies in outer space
• D) Opposing forces like friction and wind hindrance act on it

2. According to Newton's first law, what is required to change the state of motion of an object?

• A) An external force
• B) An increase in mass
• C) A change in temperature
• D) An internal reaction

3. What is the term for the tendency of an object to maintain its current state of rest or motion unless a force is applied?

• A) Momentum
• B) Inertia
• C) Acceleration
• D) Gravity

4. What is the standard unit of force mentioned in the text?

• A) Kilogram
• B) Joule
• C) Meter/second²
• D) Newton

5. According to Newton's third law, on how many objects do an action force and its corresponding reaction force act?

• A) They both act on the same single object.
• B) They act on two different objects.
• C) The action acts on one object, but the reaction is a concept and acts on none.
• D) It depends on whether the objects are in motion or at rest.

6. Newton's second law states that the rate of change of momentum is proportional to the applied force. How does the text justify changing 'proportional to' to 'equal to' in the formula F=ma?

• A) By assuming the mass of the object is always 1 kg.
• B) By ignoring the effects of gravity.
• C) Because force is defined in such a way to make them equal.
• D) Because the proportionality constant is always one in every situation.

7. When a stopped bus suddenly starts moving, why do the passengers lean backward?

• A) Due to the bus's acceleration
• B) Due to the electromagnetic force
• C) Due to inertia of rest
• D) Due to the force of gravity