Forces, Balanced Forces, Scalars and Vectors

A box sits at rest on a table. Which statement best describes the forces acting on the box?

Which of the following is an example of a non-contact force?

A car is traveling at a constant velocity of 25 m/s. What can be said about the forces acting on the car?

Which of the following is a scalar quantity?

An object with a mass of 5 kg is lifted 2 meters vertically. Calculate the gain in gravitational potential energy (GPE) of the object, assuming g = 10 N/kg.

A spring with a spring constant of 20 N/m is stretched by 0.1 meters. Calculate the force applied to the spring, assuming it obeys Hooke's Law.

In an experiment to determine the spring constant, a student consistently reads the ruler from an angle, rather than at eye level. What type of error is this?

A spring with a spring constant of 50 N/m is stretched by 0.2 meters. Calculate the energy stored in the spring.

Which of the following conditions is necessary for a star to maintain stability during its main sequence phase?

What is the primary factor determining whether a super red giant will end its life as a neutron star or a black hole?

What is the key role of supernova explosions in the lifecycle of stars and the formation of new stellar systems?

Which of the following best describes the motion of a geostationary satellite?

Why is the acceleration of a satellite in a circular orbit considered to be constantly changing, even if it maintains a constant speed?

What is the frequency of a wave if its time period is 0.25 seconds?

A ripple tank is used to measure the properties of a wave. If the distance between 10 peaks is 20 cm, and the frequency is 5 Hz, what is the wave speed?

What is the significance of 'red shift' in the context of understanding the universe?

What is the role of centripetal force in maintaining a satellite's orbit?

During an ultrasound scan, what happens when the ultrasound waves reach a boundary between two different mediums?

Why do seismologists believe the Earth's outer core is liquid?

How does the speed of a satellite in an elliptical orbit change as it moves around the Earth?

Which of the following best describes specular reflection?

What distinguishes electromagnetic waves from other types of waves?

Which of the following statements accurately describes the relationship between frequency, energy, and wavelength in the electromagnetic spectrum?

Why are UV, X-rays, and gamma rays considered more dangerous than radio waves or visible light?

What happens to a light ray when it enters a glass block from air at an angle to the normal?

How does a convex lens form an image?

An object is placed very close to a convex lens. What will be the properties of the image formed?

What type of image is always formed by a concave lens?

If a lens has a magnification of 0.5, what does this indicate about the image?

Why does a leaf appear green?

What is a key characteristic of a permanent magnet?

A wire carrying electric current is placed perpendicular to a magnetic field. Which of the following changes will result in the greatest increase in the force experienced by the wire?

A transformer efficiently converts 240 V AC to 12 V AC. If the primary coil has 400 turns, how many turns does the secondary coil have?

Which of the following statements accurately describes the behavior of magnetic field lines?

A copper wire is moved rapidly through a strong magnetic field. What effect, if any, will this have on the wire?

In an electric motor, what is the primary function of the split-ring commutator?

Which of the following actions will NOT increase the speed of an electric motor?

A step-up transformer increases voltage from 200 V to 2000 V. If the current in the primary coil is 5 A, what is the current in the secondary coil, assuming the transformer is perfectly efficient?

What is the primary purpose of using step-up transformers in the national grid?

Which of the following materials can be easily magnetized to form an induced magnet?

Fleming's left-hand rule describes the relationship between force, magnetic field, and current. Which of the following correctly identifies what each digit represents?

What energy conversion takes place in a microphone?

Which of the following statements about transformers is correct?

A wire is placed parallel to magnetic field lines. What is the magnitude of force acting on the wire due to the magnetic field?

How can the dynamo effect be utilized in power stations to generate electricity?

A loudspeaker works using the motor effect. How is the electrical signal converted into sound waves?

A gear system consists of a small gear driving a larger gear. How does this arrangement affect the moment produced?

A submarine descends deeper into the ocean. What happens to the pressure acting on its hull, and why?

A sealed container of gas is heated. What effect does this have on the gas pressure inside the container?

An object accelerates uniformly from rest to a velocity of 10 m/s in 2 seconds. What is the object's acceleration?

A car's velocity-time graph shows a horizontal line. What does this indicate about the car's motion?

A ball is thrown vertically upwards. At its highest point, what are its velocity and acceleration?

Which of the following statements accurately describes Newton's Third Law of Motion?

In an experiment to verify Newton's Second Law using a trolley on a track, how is the mass of the system kept constant when the accelerating force is changed?

Why does increasing the time over which a force acts to change an object's momentum reduce the impact force?

A car is travelling at 20 m/s. The driver sees an obstacle and applies the brakes, resulting in a braking distance of 12 meters. If the car were travelling at 40 m/s, what would be the braking distance, assuming the same braking force?

When a gun is fired, the bullet moves forward, and the gun recoils backward. Which of the following statements best explains why this happens?

What distinguishes speed from velocity?

A wave transfers energy without transferring matter. What is the immediate effect of the energy transfer on the medium through which the wave travels?

What is the difference between a compression and a rarefaction in a longitudinal wave?

How are the frequency (f) and time period (T) of a wave related?