Combined Forces

Q. A body is at rest on the surface of the earth. Which of the following statement(s) is/are correct?

1. No force is acting on the body.
2. Only weight of the body acts on it.
3. Net downward force is equal to the net upward force.
4. There is gravitational force acting on both the body and the earth.

Q. is a push or a pull applied on an object.

1. Force
2. Momentum
3. Speed

Q. Which of these forces are involved while catching a tennis ball with hands?

1. Muscular force
2. Frictional force
3. Magnetic force
4. Gravitational force

Q.

Which of the following is an example of muscular force?

1. Car pushed by a man

2. Friction between two blocks

3. Iron nails attracted by magnet

4. Freely falling ball

Q. The girl is pushing the box placed on a smooth surface while the boy is pulling it. What can we say about the motion of the box?

1. It will start to move towards the boy.
2. It will start to move towards the girl.
3. It will not move.
4. It will start to move in the downward direction.

Q. A piece of small iron bar is kept on table. A magnet is kept above and close to it. Identify the forces and their respective directions on the piece of iron bar.

1. Gravity - upwards
   Magnetic - upwards
2. Gravity - upwards
   Magnetic - downwards
3. Gravity - downwards
   Magnetic - downwards
4. Gravity - downwards
   Magnetic - upwards

Q. In which direction do gravitational force and frictional force act?

Q.

What do you understand by the term consequential force? Support your answer with an example?

Q. Which of these forces have significant role for an airplane flying in the sky?

1. Magnetic force of the clouds
2. Electrostatic Force
3. Gravitational force of the Earth
4. Frictional force of air

Q. In a supermarket, you and your dad went to buy groceries. You took a small trolley whereas your dad took a big trolley as shown in the figure. Who according to you is pushing the trolley?

1. Both are pushing the trolley.
2. None of you is pushing the trolley.
3. You are pushing the trolley.
4. Dad is pushing the trolley.

Q. As shown below, person A is pushing the object while person B is pulling it. If the object remains stationary, which of the following statements is correct?

1. Neither A nor B is applying force.

2. Only A is applying force.

3. Only B is applying force.

4. Both A and B are applying force.

Q.

Total normal force exerted by an object on a surface.

Q. Two of your friends were applying force to move the big box as shown in the figure. Friend A is trying to push the box and friend B is trying to pull the box. In which way, their feet will move if he is trying to pull the box?

1. Friend A will move towards the box.
2. Friend B will move away from the box.
3. Friend B will move towards the box.
4. Both of them will move away from the box.

Q. This section contains 1 Assertion-Reason type question, which has 4 choices (a), (b), (c) and (d) out of which ONLY ONE is correct.

इस खण्ड में 1 कथन-कारण प्रकार का प्रश्न है, जिसमें 4 विकल्प (a), (b), (c) तथा (d) दिये गये हैं, जिनमें से केवल एक सही है।

A : Friction force remains same when applied force on a moving object is doubled.

A : जब एक गतिमान वस्तु पर आरोपित बल को दोगुना किया जाता है, तब घर्षण बल समान रहता है।

R : Static friction is a self adjusting force.

R : स्थैतिक घर्षण एक स्व-समंजनीय बल है।

1. Both (A) and (R) are true and (R) is the correct explanation of (A)
   
   (A) तथा (R) दोनों सही हैं तथा (R), (A) का सही स्पष्टीकरण है
2. Both (A) and (R) are true but (R) is not the correct explanation of (A)
   
   (A) तथा (R) दोनों सही हैं लेकिन (R), (A) का सही स्पष्टीकरण नहीं है
3. (A) is true but (R) is false
   
   (A) सही है लेकिन (R) गलत है
4. (A) is false but (R) is true
   
   (A) गलत है लेकिन (R) सही है

Q.

what is the meaning of the word repulsive?

Q. A man is opening up a juice can with the help of a can opener. What force(s) are being used in the picture?

1. Muscular force
2. Frictional force
3. Mechanical force
4. Electrostatic force

Q. Forces of magnitudes 20 N and 10 N are applied on a box in opposite directions. The magnitude of net force is:

1. 10 N
2. 5 N
3. 30N
4. 15 N

Q. A pulley changes the direction of force.

1. True
2. False

Q.

Why does a wheel and axle consists of two wheels with different diameters?

Q.

when we apply a balanced force on an object its shape changes. why?

Q.

A block kept at rest on a horizontal table is pushed by two horizontal forces, one towards north and other towards south, which are equal in magnitude. What can be said about the motion of the block?

1. The block will move upwards.
2. The block will move towards east.
3. The block will remain stationary.
4. The block will move towards west.