Answered

B. Choose the correct answer.

1. A dropper to fill eye drops works because of which of the following?
a. Friction
b. Magnetic force
c. Air pressure
d. Electrostatic force

2. A ball is moving over a horizontal smooth surface with a constant velocity. Which type of force is acting on the ball?
a. Frictional force
b. Gravitational force
c. No force
d. Muscular force
e. Magnetic force

3. What type of force is used in a scrap yard to pick up iron items?
a. Muscular force
b. Electrostatic force
c. Magnetic force
d. Gravitational force



Answer :

GinnyAnswer

Final answer:

Friction is a contact force, magnetic force is a non-contact force, and no force acts on a ball with constant velocity.


Explanation:

Friction is the correct answer because it is classified as a contact force, unlike magnetic force, which is a non-contact force. When a ball moves on a horizontal smooth surface with constant velocity, the force acting on it is no force as there is no change in velocity, hence no acceleration. In a scrap yard to pick iron items, the gravitational force is used as it attracts the iron items towards the magnetic crane.


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