Exploring Forces

Magnitude of force refers to its __________.

If you push a ball on the floor, it eventually stops because of __________.

If a force is applied to an object but it doesn't change its state of motion or shape, it is because __________.

Which of the following actions describes 'pulling'?

In Science, a force is described as a result of an interaction between at least two objects. Based on the diagram of a person pulling a trolley, which of the following statements best explains what happens to the pulling force if the person suddenly lets go of the handle?

Two forces, $F_1$ and $F_2$, are applied to a wooden block from opposite directions. $F_1$ pushes the block from the left towards the right, while $F_2$ pushes it from the right towards the left. If the block is observed to accelerate towards the left, what can be concluded about the magnitudes of these two forces?

The force that acts between two surfaces in contact and opposes their relative motion is:

An object has a weight of $60 N$ on Earth. What will be its weight on the Moon (where gravity is $1/6th$ of Earth)?

Why is it difficult to walk on a wet marble floor?

If you are in a car that suddenly turns left, you feel pushed to the right. This 'feeling' is due to your body trying to maintain its state of motion. What is this property called?

A stationary object will remain stationary unless an ________ force acts on it.

Forces act because of ________ between objects.

A force is said to be balanced if the net force is:

When a rubber ball is pressed with hands, its ________ changes.

When a professional footballer strikes a stationary ball with great force, the ball momentarily compresses at the point of contact before accelerating across the field. This observation demonstrates that the applied force has caused:

In which of the following cases is force causing a change in the state of motion?

When a heavy stone is pushed, but it doesn't move, the force applied is:

Which of the following describes a force changing the size of an object?

A cyclist stops pedaling and the cycle slowly comes to a stop. The force responsible for changing the cycle's state of motion is:

When a heavy stone is dropped into a heap of sand, it creates a depression. This is an example of force:

Which of the following is an example of pulling?

Force is a ______ quantity because it has both magnitude and direction.

A batsman changes the direction of a moving ball by applying ______.

If multiple forces act on an object, the effect on the object is due to the ______ force.

When a person swims, they push the water backward with their hands, and the water pushes the person forward. According to the concept of forces, this movement is possible because force is an interaction between:

A magnet is fixed to a wooden board. When an iron paperclip is placed nearby, it immediately moves towards the magnet. This happens because the force acting on the paperclip is:

To change the state of motion of an object, it is necessary to apply an ______ force.

What happens to the interaction between two objects if the medium between them is changed from air to water (considering electrostatic force)?

Two people are pushing a stalled car from behind. Both push in the same direction with a force of $200 N$ each. The interaction between the people and the car results in a total force of:

If an object is at rest, we can conclude that:

An example of muscular force is:

A force is applied on a wooden block. If the surface is made oily, the friction will:

Weight of an object is actually the __________ acting on it.

Unlike poles of two magnets __________ each other.

Consider the interaction between two charged objects as shown in the diagram. If Object 1 and Object 2 were both rubbed with the same material (e.g., silk), identify the nature of the force 'F' that causes them to move in the directions indicated.

A student creates a flowchart to represent the different effects of applying force on an object. Which of the following real-life examples corresponds to the effect labeled 'X' in the diagram?

What is required for a force to come into play?

Which of the following can change the state of motion of an object?

Liquids exert pressure in which direction?

The SI unit of force is named after which scientist?

Walking on a sandy beach is more tiring than walking on a paved road because:

When you push a wall, you are applying ________ force.

Which force causes wear and tear in the moving parts of a machine?

The SI unit of force is the:

A student uses a pair of scissors to cut a thick sheet of cardboard. For the scissors to successfully cut through the material, there must be a direct physical interaction between the metal blades and the cardboard. This interaction is a specific example of a:

An industrial conveyor belt transports heavy packages up an inclined ramp to a storage area. Which contact force, acting parallel to the surface of the belt, prevents the packages from sliding backwards as they move up the slope?

A chef uses a traditional mortar and pestle to crush spices into a fine powder. This process involves moving the pestle against the spices and the mortar surface. Which two contact forces are primarily responsible for this grinding action?

Friction is often considered a 'non-conservative' force in physics. In the context of Grade 8 contact forces, this most nearly means:

When a box is sliding on a floor, what happens if we place another identical box on top of it?

What is the primary reason why we slip on a banana peel?

Non-contact forces are also known as:

When we say 'weight', we are actually referring to the force of:

Which force is acting when a magnet is held above iron filings?

The strength of a non-contact force usually ________ as the distance between objects increases.

When you rub a balloon on your hair and then bring it close to a stream of water from a tap, the water bends toward the balloon. This is an example of:

Which of these is NOT a characteristic of non-contact forces?

Water begins to flow towards the ground as soon as we open a tap. This is due to the force of:

If you have two identical-looking bars, one a magnet and one a piece of iron, how can you identify the magnet using only these two bars?

Which of these statements best describes the nature of non-contact forces at the microscopic level?

What is the primary difference between a permanent magnet and an electromagnet?

If you buy $1 kg$ of gold, you are measuring its _____.

Which force prevents us from floating away into space?

The weight of an object acts through its center of gravity. For a uniform sphere, where is this point?

If the weight of an object is $100 N$ on Earth, why is it different on Jupiter?

A scientist uses the flowchart below to represent the process of measuring weight with a spring balance. If an object is moved from Earth to a planet where the gravitational strength ($G1$) is much higher, which sequence of events correctly describes the change in the measurement?

Which quantity describes the 'heaviness' of an object due to the Earth's pull?

The mass of a body is $12\text{ kg}$. What is its weight on the Moon? (Take $g$ on Earth $= 10\text{ m/s}^2$)

A object of mass $m$ is suspended from a spring balance in a lift. If the lift falls with an acceleration $a < g$, the reading of the balance will be:

If you stretch a spring beyond its 'elastic limit', the spring balance will:

Which of the following stays the same for an object when it is moved from Earth to Mars?

If an object is floating, the net force acting on it is:

Which force pulls an object downwards into the water?

The apparent loss of weight of a body in a liquid is equal to the:

What is the relationship between Area and Pressure for a constant Force?

A solid weighs 32 g in air and 28.8 g in water. The relative density of the solid is:

What is the reason why a steel needle can sometimes float on the surface of water if placed very carefully?

A metal ball of volume 50 $cm^3$ is immersed in water. If the density of water is 1 $g/cm^3$ and $g = 10 m/s^2$, what is the buoyant force in Newtons?

A cubical block of wood of side $a$ and density $\rho$ is floating in water of density $D$. If the block is slightly depressed and released, the force tending to restore it to its equilibrium position is proportional to:

What is the reason for the 'apparent loss of weight' of a body when it is immersed in a liquid?

A balloon is filled with $500 \text{ m}^3$ of hydrogen (density $0.09 \text{ kg/m}^3$). If the fabric weights $100 \text{ kg}$, what is the net lifting force if air density is $1.29 \text{ kg/m}^3$?