A force of 10 N acts on a ball moving on a surface. The force of friction that must act between the surface of the ball and the surface so that the ball keeps on moving with constant velocity over the surface must be:a)Zerob)20Nc)10Nd)100NCorrect answer is option 'C'. Can you explain this answer?

Question

Answer

Let's, first understand it. It's given a forward force of 10N is acting. Also, we know friction force always opposes direction of motion. Now, it's asking for constant velocity. This is the question. For constant velocity, acceleration must be zero. Let me prove it for beginners. a = v-u/t Constant velocity, so v = u a = v-v/t = 0/t = 0m/s^2 Now we also know F net = ma So, F net = m(0) = 0N So, we found F net = 0N Also we know a force of +10N is already acting so, a force of -10N should also act. So, friction force must be 10N. Extra Fact: This will be the only answer for constant velocity but if question says the ball should move and doesn't ask whether it is accelerate or not then answer will be less than or equal to 10N because if static friction becomes more than 10N then obviously ball would not move. Hope it helps. Also, you can search about other types of friction like static, kinetic and limiting friction. I am unable to type all the matter here.

Answer

C

Answer

Because no frictional force acting on the ball
and ball is moving with constant velocity

Answer

10N

Answer

Because if force of friction is greater than force acted on the ball then it will definitely stop. so, it must be equal so as to keep the ball moving at constant velocity over the surface .

Answer

10N to third law of motion

Answer

Given:
- Force acting on the ball = 10 N
- The ball is moving with a constant velocity

To find:
The force of friction that must act between the surface of the ball and the surface so that the ball keeps on moving with a constant velocity.

Solution:

1. Understanding the concept:
Friction is a force that opposes the motion of an object. It can be classified into two types:
1. Static friction: The friction between two surfaces that are not moving relative to each other.
2. Kinetic friction: The friction between two surfaces that are in relative motion.

When an object is moving with a constant velocity, the forces acting on it are balanced. In this case, the force of friction acting on the ball must be equal in magnitude and opposite in direction to the applied force of 10 N. This ensures that the net force on the ball is zero and the ball maintains a constant velocity.

2. Determining the force of friction:
Since the ball is moving with a constant velocity, the force of friction must be equal to the applied force of 10 N. Therefore, the force of friction that must act between the surface of the ball and the surface for the ball to keep moving with a constant velocity is 10 N.

3. Answer:
The correct answer is option C) 10 N.

Similar Class 9 Doubts

A motorcycle of mass of 2000 kg is moving over a horizontal road,with uniform velocity. If this motorcycle has to be stopped with a negative acceleration of 1.5 m/s square,then what is the force of friction between the tires and the road?

. A stone of 1 kg is thrown with a velocity of 20 m/s across the frozen surface of a lake and comes to rest after travelling a distance of 50 m. What is the force of friction between the stone and the ice? * 1 point

An object of mass 2kg is sliding with a constant velocity of 4m/s on a frictionless horizontal tabel.the force required to keep the object moving with the same velocity will be?

A object of mass 5kg is sliding with a constant velocity of 4 m/s on a frictionless horizontal surface. What is the Force required to keep the object moving with the same velocity?

A stone of 1 kg is thrown with a velocity of 20m s-¹ across the frozen surface of a lake and comes to rest after travelling a distance of 50m. What is the force of friction between the stone and the ice ?

Top Courses for Class 9View all

Science Class 9

Social Studies (SST) Class 9

Mathematics (Maths) Class 9

English Class 9

English Grammar Advanced

Top Courses for Class 9

Top Courses for Class 9

Suggested Free Tests

Related Content

Class 9 Study Material

Class 9 Subjects

Competitive Examinations for Class 9

NCERT Books

NCERT Solutions

Reference Books for Class 9

Other Popular Exams

Company