Question

question 2 (1 point)
gravity is not a contact force.
true
false
question 3 (1 point)
in most of the cases air resistance is taken as zero.
true
false
question 4 (1 point)
which of the following forces is a non - contact force?
a normal force
b friction force
c magnetic force
d applied force

Explanation:

Question 2

Contact forces require physical contact between objects. Gravity acts at a distance (e.g., Earth's gravity on the Moon), so it is a non - contact force.

In many basic physics problems (like free - fall problems), air resistance is neglected (taken as zero) to simplify calculations. This is a common assumption in introductory physics.

• Normal force: Exists between two surfaces in contact (e.g., a book on a table), so it is a contact force.
• Friction force: Acts between two surfaces in contact (e.g., a sliding block on a floor), so it is a contact force.
• Magnetic force: Can act at a distance (e.g., two magnets attracting or repelling each other without contact), so it is a non - contact force.
• Applied force: Usually involves a physical push or pull (contact), e.g., pushing a cart.

Answer:

True

Question 3