Net Force

Q.

Question 16

A gas filled balloon moves up. Is the upward force acting on it larger or smaller than the force of gravity?

Q.

In a tug of war, when the two teams are pulling the rore, a stage comes when the rope does not move to either side at all .

What can you say about the magnitudes and directions of the forces being applied to the rope by the two teams at this stage ?

Q.

A force is defined as a

Q.

A screwdriver can act as a lever, inclined plane, and a wheel and axle depending upon the task it does. What type of simple machine will a screwdriver act like when it is used to
(a) Remove a screw from an object?

Q. An object moves in the direction of the net force acting on it.

1. True
2. False

Q. Calculate the net force acting on the block.

1. 25 N, Downwards
2. 70 N, Upwards
3. 50 N, Downwards
4. 20 N, Upwards

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. When a hockey player strikes a moving ball in the direction of its motion, the speed of the ball .

1. increases
2. decreases
3. remains same

Q. When a coin and feather are dropped simultaneously from the same height the coin strikes the ground first.Why?

Q.

When a force is applied to an object the direction of motion is always away from us.

1. True
2. False

Q.

A point about which an object can turn is called pivot.

1. True
2. False

Q.

A little boy was playing tug of war with his elder brother; he tried everything but was unsuccessful in pulling the rope towards himself.

Statement1: Elder brother was capable of applying a greater force than his younger brother and hence the net force was in a direction to make him win.

Statement2: An object moves in the direction of the net force acting on it.

1. Statement 1 is true, Statement 2 is true and Statement 2 is not the correct explanation of statement1.

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

3. Statement 1 is true, Statement 2 is true and Statement 2 is the correct explanation of statement1.

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

Q.

Two forces of magnitude 20 N and 10 N are acting on a box in the opposite direction. What is the magnitude of the net force acting on the box?

1. 15 N

2. 10 N

3. 5 N

4. 30 N

Q.

What is a pulley? What is a single movable pulley and how much M.A does it provide? How does one use a single fixed pulley along with such a pulley to apply the force in a convenient direction?

Q. How can we find the net force if two forces are acting in opposite directions?

Q. Which of the following statement(s) could be true for a body at rest?

1. No force is acting on the body.
2. Net force acting on the body is zero.
3. Net force acting on body has a non zero value.
4. All forces acting on the body are in the same direction.

Q.

In the diagram, two friends are pushing a box in opposite directions as shown below. In which direction will the block move?

1. Can't say

2. The box will not move

3. West

4. East

Q.

In an experiment, the two opposite ends of a cart are attached to two horses respectively. The two horses are trying to move the cart in their respective 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 non-zero.

3. The direction of the net force acting on the cart is in the vertical direction.

4. None of these

Q.

1. Name the forces acting on a plastic bucket containing water held above ground level in your hand. Discuss why the forces acting on the bucket donor bring a change in its state of motion?

2. A rocket has been fired upward bto launch a satellite in its orbit. Name the two forces acting on the rocket immediately after leaving the launching pad?

Q. Why

Q.

What are balanced and unbalanced forces?

Q. Question 11

A girl is pushing a box towards east direction. In which direction should her friend push the box so that it moves faster in the same direction?

Q. What happens when two forces are applied in the opposite direction on an object?

1. Net force is the addition of forces.
2. Net force is the subtraction of forces.
3. Net force is the multiplication of forces.
4. Net force is the division of forces.

Q.

What is a resultant force?

Q. A body is at rest on the surface of the earth. Which of the following statements is 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 no gravitation to pull it down.

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. The net force applied on an object is taken as the sum of the magnitudes if they act in directions.

1. opposite
2. different
3. same

Q. Force can only increase or decrease the speed of a moving object or change its direction.

1. False
2. True
3. Both
4. None

Q. What will be the net force if 10N and 15N forces are acting on an object

Q. Ram is trying to push a box from his living room to the storeroom. He asks his friend to help him to complete the job. What should be the direction of the force that the friend should apply?

1. Direction opposite to which Ram is pushing the box.
2. Same direction in which Ram is pushing the box.
3. Direction perpendicular to which Ram is pushing the box.
4. Vertically downwards direction.