S3Sc(Phy): Force and Pressure Quiz

Srikarthik is pushing a heavy box across the floor. What is the SI unit of the force he is applying?

Answer explanation

The SI unit of force is the Newton, named after Sir Isaac Newton. It is commonly written as 'newton' in lowercase when referring to the unit in general terms, but 'Newton' is also acceptable in formal contexts.

What does a gravitational field refer to?

• A region where a magnetic force is experienced

• A region where a mass experiences a force due to gravitational attraction

• A region where an electrostatic force is experienced

• A region where a body experiences air resistance

Answer explanation

A gravitational field is defined as a region where a mass experiences a force due to gravitational attraction, making the second answer choice correct. The other options refer to different types of forces.

During a soccer match, Ivan kicked the ball with great force. Which of the following is NOT an effect of the force he applied on the ball?

• Change the shape of the ball

• Change the mass of the ball

• Stop the ball from moving

• Cause the ball to change direction

Answer explanation

The force Ivan applied can change the ball's shape, stop it, or alter its direction. However, it cannot change the mass of the ball, as mass is a property that remains constant regardless of the forces applied.

• weight

• mass

• gravity

• distance

• force

• time

Answer explanation

Weight is the force experienced by an object due to gravity. The relationship is given by the formula: weight = mass × gravity, where gravity represents the gravitational field strength.

Ethan is conducting an experiment in his science class to find out the density of different liquids. He measures the mass of a liquid and its volume. What is the relationship for density?

• Density = mass / volume

• Density = force / area

• Density = mass × volume

• Density = force × area

Answer explanation

The correct relationship for density is Density = mass / volume. This formula shows that density is calculated by dividing the mass of a substance by its volume, which is fundamental in understanding the properties of liquids.

Kumar is playing tug of war with his friends Tristen and Alessia. Which of the following forces are they using to pull the rope towards themselves?

• Gravitational force

• Electrostatic force

• Tension

• Magnetic force

Answer explanation

In tug of war, Kumar, Tristen, and Alessia exert a pulling force on the rope. This force is known as tension, which is the force transmitted through the rope as they pull it towards themselves.

Tristen is has forgotten the definition of Mass, help him define Mass is...

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Answer explanation

Mass is a measure of the amount of matter in an object, typically measured in kilograms or grams. It reflects how much substance is present, regardless of the object's volume or shape.

State the definition of weight

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Answer explanation

Weight is the force exerted by gravity on an object, calculated as the product of mass and the acceleration due to gravity (W = m × g). It is measured in newtons (N) in the SI system.

Help Jerrel decide which of these statements is correct.

• The mass of an object can be measured with spring balance.

• The mass of an object does not change with location.

• The weight of an object can be measured with a beam balance.

• The weight of an object can never change.

Answer explanation

The correct statement is that the mass of an object does not change with location. Mass is a measure of the amount of matter in an object and remains constant regardless of where the object is located.

Ethan is conducting an experiment in his science class to determine the properties of different liquids. He learns that the density of pure water at 4.0 °C is a crucial factor in his experiment. What is the density of pure water at this temperature?

• 0.5 g/cm³

• 1.0 g/cm³

• 1.5 g/cm³

• 2.0 g/cm³

Answer explanation

The density of pure water at 4.0 °C is 1.0 g/cm³, which is a well-known fact in science. This value is crucial for understanding the behavior of liquids in Ethan's experiment.