Vector

Q. What is magnitude of force?

Q.

The net force acting on a body in uniform circular motion is

1. can be zero or non-zero depending on the speed of the body

2. none of these

3. definitely zero

4. definitely non-zero

Q.

Velocity of an object can be changed by altering:

1. None of these

2. Its direction of motion

3. Its magnitude by application of a force

4. Both A & B

Q.

Explain vector with the help of examples.

Q. A force is described with:

1. Magnitude only
2. Direction only
3. Both direction and magnitude
4. Either magnitude or direction

Q.

How do you define a vector?

Q.

Name two effects which a force can produce in a moving body.

Q. A spring of force constant k is cut into two pieces whose lengths are in the ratio 1:2. What is the force constant of the loner piece? k/2 3k / 2 2k 3k

Q.

What quantity is not vector?

Q. What changes can a force bring in an object, when applied to it? Do force always brings a change in the state of motion of an object?

Q. If we blow air from our mouth on the smoke rising up from joss stick, then the of smoke changes.

1. mass
2. colour
3. direction of motion

Q.

Sir, as said that vector quantities measure both direction as well as magnitude and scalor just me sure the direction so on what basis or from what terms these two names vector and scalor are derived

Q. The direction of a moving ball changes when it strikes a wall.

1. True
2. False

Q. What do you mean by ventor? What is the role of it in our life ?

Q. Which of the following is not a vector quantity?

1. Velocity
2. Displacement
3. Pressure
4. Force

Q. A vector quantity has magnitude but no direction.

1. True
2. False

Q. A force is described with:

1. Magnitude only
2. Direction only
3. Both direction and magnitude
4. Either magnitude or direction

Q.

The effect that force produces in a slingshot is change in shape of the body.

1. False

2. True

Q. When can you say that the state of motion of an object has changed?

1. There is a change in the speed of the object.
2. There is a change in the direction of motion of the object.
3. There is no change in the speed of the object.
4. There is no change in the direction of motion of the object.

Q.

The effect that force produces in a slingshot is change in shape of the body.

1. True

2. False

Q. A force is described with:

1. Magnitude only
2. Direction only
3. Either magnitude or direction
4. Both direction and magnitude

Q. A force is described with:

1. Magnitude only
2. Direction only
3. Both direction and magnitude
4. Either magnitude or direction

Q. With respect to vector quantities, which of the following is not correct?

1. Vectors have magnitude as well as direction.
2. Vectors cannot be added.
3. Velocity is a vector quantity.
4. The magnitude of a vector is represented by its length.

Q. Which of the following statement(s) is/are true?

1. Forces in the same direction add up.

2. Two forces in opposite directions result in a net force which is equal to their difference and acts in the direction of the larger force.

3. Change in the direction of a force does not change its effect.

4. When more than one force is acting on an object, the net effect is due to resultant of all forces.

1. 1 and 3

2. 2 and 3

3. 2, 3 and 4

4. 1, 2 and 4

Q.

What is the magnitude and direction of the net force acting in the given situations?

1. 
   110 N towards left

2. 
   90 N towards left

3. 
   100 N towards left

4. 
   120 N towards left

Q. A force can:
1. Increase the speed of a moving body.
2. Change the shape of an object.
3. Decrease the speed of a moving body.
4. Bring a moving body to rest.

1. 1 and 2 only
2. 2 and 3 only
3. 2, 3 and 4 only
4. 1, 2, 3 and 4

Q.

Give an example of the case where force produces motion.