Balanced and Unbalanced Force

Q.

Forces that are equal in size but opposite in direction are____________.

Q. Two forces are acting on a body. If the forces are balanced, the net force is:

1. negative
2. zero
3. can't say
4. positive

Q.

Name the type of force when the resultant force acting on a body is not zero.

Q.

Statement 1: For the same force acting on two different surfaces, more pressure is developed on the surface with a smaller area.
Statement 2: Pressure is defined as force per unit area.

1. Statement 1 is true, Statement 2 is true and Statement 2 is the correct explanation of Statement 1.

2. Statement 1 is true, Statement 2 is true and Statement 2 is not the correct explanation of Statement 1.

3. Statement 1 is true and Statement 2 is false.

4. Statement 1 is false and Statement 2 is true.

Q.

Under what condition a body is said to be under balanced and unbalanced forces?

Q. A cart at rest is acted up on by 80 N force towards left and 60 N force towards right. What is the magnitude of the net force on the cart and in which direction will the cart move?

1. 20 N, right
2. 40 N, left
3. 20 N, left
4. 80 N, right

Q. To finish off her cheesecake, Tissa adds a layer of whipped cream and a strawberry on top. There are two forces acting on the strawberry, an upward force from the cream and a downward force of gravity. If the force of gravity is larger than the force from the cream then:
vas

1. The strawberry will fly off from the cream.
2. The strawberry will stay where it is.
3. None of these
4. The strawberry will sink into the cream.

Q.

Shivam was travelling by a bus. An old man was sitting beside him. Suddenly the bus broke down on its way. The next bus stop was half a kilometre away from there. Shivam and old man had to cover this distance on foot. Shivam had no luggage. The old man had a suitcase having thin and small handle and he was feeling uncomfortable in carrying it. Shivam asked the old man to allow him to carry his suitcase. And thus he carried the old mans suitcase to the bus stop.

(A) Why was the old man feeling uncomfortable in carrying the suitcase? Give the scientific reason.

(B) What type of suitcase should he have so that he does not face such problems? Give reasons.

(C) Which moral value did Shivam show by carrying the suitcase?

Q. Two opposite ends of a cart are attached to two horses respectively. The two horses pull the cart in opposite directions, but it is observed that the position of the cart does not change. What can be the possible explanation?

1. The net force acting on the cart is zero.
2. The net force acting on the cart is positive.
3. The direction of the net force acting on the cart is in the vertical direction.
4. The net force acting on the cart is negative.

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. 15 N
4. 30 N

Q. Calculate the pressure developed by a force of $\text{50 N}$ acting on an area of ${\text{10 m}}^2$.

1. $\text{10 Pa}$
2. $\text{5 Pa}$
3. $\text{15 Pa}$
4. $\text{20 Pa}$

Q. A force applied on a body always bring a change in its state of motion.

1. True
2. False

Q. Ram is trying to push a box from position A to position B. He asks his friend to help him complete the job. In what direction should his friend apply the force?

1. In the same direction in which Ram is pushing the box
2. In the direction opposite to the direction of Ram's force
3. Sitting on top of the box in order to reduce friction
4. In the direction perpendicular to which Ram is applying the force

Q.

A box is at rest on a smooth surface. Two friends are pushing it in opposite directions as shown below. Choose the correct option.

1. Net force is zero.
2. Net force is $3N$ in the left direction.
3. Net force is $3N$ in the right direction.
4. Net force is $17N$ in the left direction.

Q.

If a body has to be pushed along positive X-axis, then in which direction the force should be applied?

1. Along +Y axis
2. Along +X axis
3. Along +Z axis
4. Force does not have any direction

Q.

While cooking, a chef cuts his hand with a sharp-edged knife. To his surprise, his hand did not get a cut with a spoon even on the application of a greater force. What can be a possible reason for this difference?

1. For the same force, the pressure developed due to the knife is much larger because of its sharp edge.

2. For the same force, the pressure developed due to the knife is much smaller because of its sharp edge.

3. For the same force, the pressure developed due to the spoon is much larger because of its sharp edge.

4. For the same force, the pressure developed due to the spoon is much smaller because of its sharp edge.