Effects of Force

Q.

What is a moment of force and moment of the couple?

Q.

27. SI unit of atmospheric pressure is

1. Newton

2. Pascal

3. Joule

4. kg/m

Q.

If the force applied to an object is in the direction of its motion, its speed decreases.

1. True

2. False

Q. The given figure shows a squeezed rubber ball. Which of the following effects of force describes this activity?

1. Force can change the speed of a moving object.
2. Force can change the direction of an object.
3. Force can stop a moving body.
4. Force can change the shape and size of an object.

Q.

When a spring is stretched, the force changes the _________ (mass/shape) of the spring.

Q.

Which of the following cases can change the effect of the force?

1. Changing the magnitude of force.

2. Changing the direction of force.

3. None of these.

4. Changing both magnitude and direction.

Q.

When your friend pushes your bike from behind, what will happen to the speed of the bike?

1. Direction

2. Speed

3. Both

4. None of these

Q.

Squeezing sugarcane juice with a squeezer is an example of ………………..

Q.

Explain why a Rolly Polly doll always stand erect.

Q.

A force acting on an object

1. can change direction of its velocity.

2. can change magnitude of its velocity.

3. must change magnitude of its velocity.

4. must change direction of its velocity.

Q. Which of the following can be done by a force?

1. It can change the direction of motion of a body.
2. It can change the speed of a body.
3. It can change the shape of a body.
4. It can change the mass of a body.

Q.

What is random motion? Give an example.

Q.

In cricket, a cricketer catching a ball is an example of which property of force-

1. Making a stationary of the true

2. Changing the shape of an object

3. Making a moving body stationary

4. Changing the color of an object

Q.

Why is the atmospheric pressure expressed in terms of centimeters of mercury, rather than in pascal?

Q.

Harshit is sitting inside a stationary bus. Which of the following objects will appear to be moving with respect to him?

1. Another bus passing by your bus

2. Fellow passengers

3. Seats of the bus

4. The road on which bus stands

Q.

The stretching force is responsible for a change in the shape of the slingshot present in the above picture.

1. True

2. False

Q.

Squeezing sugarcane juice with a squeezer is an example of ………………..

Q.

What is a force?

1. A pull only

2. A push only

3. An effort that changes the state of motion or shape of an object

4. Both A and B

Q.

In which direction the force must be applied, when a single pulley is used with a mechanical advantage greater than one?

1. Downward direction

2. Upward direction

3. Both the direction

4. Can be any random direction

Q.

What can a force do?

1. 1 and 2 only

2. 2 and 3 only

3. 2, 3 and 4 only

4. All of the above

Q. The rope will move towards ______ due to the _______ force.

1. Side B; pull
2. Side B; push
3. Side A; pull
4. Side A; push

Q.

A block of mass $10kg$ which was originally at rest, is being pushed by two equal forces in opposite directions. What can we say about the motion of the block?

1. Rest

2. Motion

3. Both

4. None of these

Q.

If the force applied on an object is in the direction of its motion, its speed________

1. decreases

2. remains same

3. increases and then decreases

4. increases

Q.

An object is said to be in equilibrium if ___.

1. it is moving at a constant speed

2. it is moving with a constant acceleration

3. no forces act upon it

4. no net force acts upon it

Q. Which of the following effects is NOT seen when a player kicks a moving football?

1. Change in direction of the football
2. Change in mass of the football
3. Change in shape of the football
4. Change in speed of the football

Q.

Force can

1. stop a moving body

2. change the shape of a body

3. change the direction of a body

4. all of these