Force

Q.

Define force. State its S.I. unit.

Q.

Name a device which is used to measure force acting on an object.

Q.

What is the push or pull on an object known as ?

Q.

What is the meaning of thrust

Q. The SI unit of torque is:

1. N
2. Nm
3. N/m
4. m

Q.

To stretch the bow, the archer applies a force that causes a change in its _________.

The force applied by the archer to stretch the bow is an example of ____________ force.

The type of force responsible for a change in the state of motion of the arrow is an example of a _________ force.

While the arrow moves towards its target, the force acting on it are due to ___________ and that due to ____________ air.

Q.

If the force is applied in the direction opposite to the direction of motion, then it results in a decrease in the speed of the object in the same direction of motion.

1. False

2. True

Q.

What kind of action is drawing of water from a well? How can it happen that we are pulling the rope in downward direction and the bucket is moving in upward direction? [2 MARKS]

Q.

When a force of 1 N acts on a mass of 1 kg that is free to move, the object moves with

1. a speed of 1 m/s

2. a speed of 1 km/s

3. an acceleration of $10m/s^2$

4. an acceleration of $1m/s^2$

Q. The force acting on a body can change its:

1. direction of motion
2. speed
3. shape
4. mass

Q.

Differentiate between the inclined plane and wedge.

Q.

Impulse has the same unit as that of :

1. force

2. pressure

3. momentum

4. moment of force

Q. We say that interaction of two objects are necessary for a force to come into play. In the other hand we say that non-contact forces can come into play even the objects are not in contact. Interaction is required for a force to come into play or not?

Q. Which of the following is equivalent to 1 kgf?

1. 1 N
2. 9.8 kg
3. 9.8 N
4. 1 kg

Q. The SI unit of force (or it's symbol) is:

1. Newton
2. N
3. F
4. Pascal

Q.

Short note on turning effect of force about 300 to 400 words

Q.

State any three changes that a force brings about on a body. Give one example of each.

Q. A nut just opens by applying a force of 150 N using a wrench of length 30 cm. If we wants to open it by a force of 50 N then the length of wrench should be:

1. 45 cm
2. 75 cm
3. 90 cm
4. 100 cm

Q.

An object experiences a net non - zero force. Is it possible for the object to move with a constant speed along a straight line?

Q.

Question 5 (d)
In the following situations identify the agent exerting the force and the object on which it acts. State the effect of the force in each case.
(d) An athlete making a high jump to clear the bar at a certain height.

Q.

Give reason why the mud stuck to a vehicle flies off tangentially during the motion of the wheel

Q.

Inertia of rest is the property by virtue of which the body is unable to change by itself:

1. the state of rest only

2. the state of uniform linear motion

3. the direction of motion only

4. the steady state of rest

Q.

What is meant by saying that 'force is due to an ineteraction'? Give an example to illustrate your answer.

Q.

When does a force perform work?

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

1. Force can stop a moving object.
2. Force can move a stationary object.
3. Force can change the direction of the moving object.
4. Force can change the mass of the object.

Q. A pair of equal and opposite forces acting on a body is called:

1. Couple
2. Pivot force
3. Dynamo
4. kilopound

Q. Two blocks of mass 3kg and 2kg are in contact with each other on a frictionless table. Find the force exerted by the smaller block on bigger block if a force of 5N is applied on bigger block.

Q. When drawing water from a well , ________ force is appled by the rope on the bucket.

1. pull
2. push
3. no
4. push and pull

Q.

Name the quantity whose units is 'Newton' (N).

Q. In the diagram, two friends are pushing a box in opposite directions as shown below. The box will move in the ___ direction.​​​​​​​

1. west
2. east
3. north
4. south