Physics P1

Physics paper 1 revision cards

What is the formula for calculating density?

Density is calculated using the formula: $\text{Density} = \frac{\text{mass}}{\text{volume}}$.

What is Newton's first law of motion?

Newton's first law states that an object will remain at rest or in uniform motion in a straight line unless acted upon by an external force.

What is the definition of work done in physics?

Work done is defined as the product of the force and the distance moved in the direction of the force: $\text{Work} = \text{Force} \times \text{Distance} \times \cos(\theta)$, where (\theta) is the angle between the force and the direction of motion.

What is the principle of conservation of energy?

The principle of conservation of energy states that energy cannot be created or destroyed, only transformed from one form to another.

What are the units of force in the SI system?

The unit of force in the SI system is the Newton (N), which is defined as $1\, \text{N} = 1\, \text{kg} \cdot \text{m/s}^2$.

What is power in physics?

Power is the rate at which work is done or energy is transferred. It is calculated using the formula: $\text{Power} = \frac{\text{Work}}{\text{Time}}$.

What is the unit of power in the SI system?

The unit of power in the SI system is the Watt (W), where 1 Watt = 1 Joule per second ($1\, \text{W} = 1\, \text{J/s}$).

What is kinetic energy?

Kinetic energy is the energy possessed by an object due to its motion, calculated by the formula: $\text{Kinetic Energy} = \frac{1}{2} mv^2$, where $m$ is mass and $v$ is velocity.

What is gravitational potential energy?

Gravitational potential energy is the energy an object possesses due to its height above the ground, given by the formula: $\text{Potential Energy} = mgh$, where $m$ is mass, $g$ is gravity, and $h$ is height.

What is Hooke's Law?

Hooke's Law states that the extension of a spring is directly proportional to the force applied to it, as long as the limit of proportionality is not exceeded. The formula is: $F = kx$, where $F$ is the force, $k$ is the spring constant, and $x$ is the extension.

What is the difference between scalar and vector quantities?

Scalar quantities have only magnitude (e.g., mass, temperature), while vector quantities have both magnitude and direction (e.g., force, velocity).

What is the formula for calculating acceleration?

Acceleration is calculated using the formula: $a = \frac{\Delta v}{\Delta t}$, where $\Delta v$ is the change in velocity and $\Delta t$ is the time taken.

What is the principle of moments?

The principle of moments states that for an object in equilibrium, the sum of the clockwise moments about a pivot is equal to the sum of the anti-clockwise moments.

What is the relationship between pressure, force, and area?

The relationship is given by the formula: $\text{Pressure} = \frac{\text{Force}}{\text{Area}}$.

What is the effect of temperature on the resistance of a conductor?

Generally, the resistance of a conductor increases with temperature due to increased vibration of the lattice structure, which impedes the flow of electrons.

What is the definition of elastic potential energy?

Elastic potential energy is the energy stored in an object when it is compressed or stretched, calculated using the formula: $\text{Elastic Potential Energy} = \frac{1}{2} kx^2$, where $k$ is the spring constant and $x$ is the extension.

What is the law of reflection?

The law of reflection states that the angle of incidence is equal to the angle of reflection, measured from the normal to the surface.

What is the speed of sound in air at room temperature?

The speed of sound in air at room temperature (approximately 20°C) is about 343 meters per second.

What is frequency in the context of waves?

Frequency is the number of complete wave cycles that pass a point in one second, measured in Hertz (Hz).

What is the formula for wave speed?

Wave speed is calculated using the formula: $v = f\lambda$, where $v$ is wave speed, $f$ is frequency, and $\lambda$ is wavelength.

What is total internal reflection?

Total internal reflection occurs when a wave hits a boundary at an angle greater than the critical angle, causing all of the wave to reflect back into the denser medium.

What is Ohm's Law?

Ohm's Law states that the current passing through a conductor between two points is directly proportional to the voltage across the two points, represented as: $V = IR$, where $V$ is voltage, $I$ is current, and $R$ is resistance.

What is an electric circuit?

An electric circuit is a complete and closed path through which electric current can flow.

What is the difference between series and parallel circuits?

In a series circuit, components are connected end-to-end, so the current is the same through all components. In a parallel circuit, components are connected across common points, so the voltage is the same across each component.

What is the equation for power in an electrical circuit?

The power in an electrical circuit is given by the equation: $P = VI$, where $P$ is power, $V$ is voltage, and $I$ is current.

What is a resistor and its purpose in a circuit?

A resistor is a component that limits the flow of electrical current in a circuit. It is used to control voltage and current levels.

What is the unit of capacitance?

The unit of capacitance is the Farad (F), which is defined as the capacitance of a capacitor when one coulomb of charge is stored per volt.

What is the principle behind radioactivity?

Radioactivity is the process by which unstable atomic nuclei lose energy by emitting radiation, including alpha, beta, or gamma radiation.

What are the three types of radiation emitted during radioactive decay?

The three types of radiation are alpha particles (helium nuclei), beta particles (electrons), and gamma rays (electromagnetic radiation).

What is half-life in radioactive decay?

Half-life is the time required for half of the radioactive atoms in a sample to decay into their products.

What is the use of a Geiger counter?

A Geiger counter is an instrument used for detecting and measuring ionizing radiation, such as alpha, beta, and gamma radiation.

What factors affect the rate of a chemical reaction?

The rate of a chemical reaction can be affected by temperature, concentration of reactants, surface area of solid reactants, and the presence of a catalyst.

What is the difference between exothermic and endothermic reactions?

Exothermic reactions release energy to their surroundings, usually in the form of heat, while endothermic reactions absorb energy from their surroundings.

What is an electrochemical cell?

An electrochemical cell is a device that converts chemical energy into electrical energy or vice versa, consisting of two electrodes immersed in an electrolyte solution.

What are the components of a wave?

The main components of a wave include the wavelength (distance between successive crests), frequency (number of waves per second), amplitude (height of the wave), and speed (how fast the wave travels).

What is resonance in physics?

Resonance occurs when a system is driven at its natural frequency, resulting in a large amplitude of oscillation.