Grade 8-9 GCSE Physics Revision Quiz

What is the unit of force?

• Newtons

• • Joules

• • Amperes

• • Kilograms

Answer explanation

The unit of force in the International System of Units (SI) is the Newton.

The acceleration of an object is directly proportional to the (a)   it experiences, according to Newton's Second Law of Motion.

Answer explanation

Newton's Second Law of Motion states that the acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object.

A wave with a high frequency would have...

• ...low energy.

• ...large wavelength.

• ...small wavelength.

• ...slow speed.

Answer explanation

In a given medium under fixed conditions, speed is constant while frequency and wavelength are inversely proportional. So, high-frequency waves have small wavelengths.

Energy can be neither created nor destroyed, but it can change forms. This statement is known as the law (a)   .

Answer explanation

The law of conservation of energy states that energy can be neither created nor destroyed – only converted from one form of energy to another. This means that a system always has the same amount of energy unless it's added from the outside.

In a closed system, the total momentum before an event must be _______ the total momentum after the event.

• ...reater than...

• ...less than...

• ...equal to...

Answer explanation

This reflects the law of conservation of momentum. The total momentum of an isolated system remains constant if no external forces act on it.

Draw a schematic of a series circuit with one battery, two resistors, and one LED. Label the components.

Answer explanation

The resistance of a wire is directly proportional to its (a)   .

Answer explanation

The distance traveled by light can be described in what unit(s) of measurement?

• light-meter

• light-mile

• light-kilometer

• light-year

Answer explanation

A light-year is a unit often used in astronomy, and it represents the distance that light travels in one year.

Work is done when a force causes...

• ...displacement of the body.

• ...equilibrium of all the forces applied to the body.

• ...inertia of the body's motion.

• ...a decrease in speed.

Answer explanation

In Physics, work is done when a force that is applied to an object moves that object. Specifically, work is the amount of force needed to move an object a certain distance.

In terms of sound, the term 'frequency' corresponds to (a)   in human perception.

Answer explanation

The frequency of a sound wave determines its pitch. Higher frequencies correspond to higher pitch, and lower frequencies correspond to lower pitch.