All of AQA Mechanics and Materials - A Level Physics REVISION

What are the two main examples of projectile motion?

Objects projected initially horizontally and objects projected at an angle, both following a parabolic path.

What is the value of acceleration due to gravity (G)?

9.81 meters per second squared.

What principle states that if there is no resultant force on an object, the object will remain at the same velocity?

Newton's First Law.

What does Newton's Second Law state about the relationship between force, mass, and acceleration?

The resultant force is equal to the rate of change of momentum, or F = ma.

Define momentum.

Momentum is the quantity of movement of a body, given by the product of its mass and velocity (p = mv).

What is the difference between elastic and inelastic collisions?

Elastic collisions conserve both momentum and kinetic energy, while inelastic collisions conserve momentum but not kinetic energy.

How is impulse defined in physics?

Impulse is the change in momentum, equal to the product of force and time (Impulse = F × Δt).

What is work done in physics?

Work done is defined as the force applied over a distance in the direction of the force (W = F × s).

What is the relationship between power and work done?

Power is the rate at which work is done, given by P = W/t.

What is the efficiency of a device?

Efficiency is the ratio of useful output energy or power to the total input energy or power, often expressed as a percentage.

What is the Young's modulus of a material?

Young's modulus is the ratio of tensile stress to tensile strain in a material.

What is Hooke's law?

Hooke's law states that the extension of a spring is directly proportional to the applied force, until the elastic limit is reached.

What defines a brittle material as opposed to a ductile one?

Brittle materials fracture without significant plastic deformation, while ductile materials undergo considerable plastic deformation before fracture.

What is the equation for gravitational potential energy?

Gravitational potential energy is given by the equation PE = mgh, where m is mass, g is gravitational field strength, and h is height.

What are the units for measuring stress?

Stress is measured in pascals (Pa), which is equivalent to newtons per square meter (N/m²).

In terms of energy, what is the relationship between kinetic energy and mass and velocity?

Kinetic energy is given by the equation KE = 1/2 mv².

Explain what terminal velocity is in free fall.

Terminal velocity is the constant speed that a freely falling object eventually reaches when the resistance of the medium prevents further acceleration.

What causes an object to reach terminal velocity?

An object reaches terminal velocity when the force of gravity is balanced by the drag force acting on it.