Motion & Speed

Front

Speed in a given direction.

Back

Velocity

Answer explanation

The term 'velocity' specifically refers to speed in a given direction, distinguishing it from 'speed', which is a scalar quantity. Other options like 'meter', 'motion', and 'slope' do not accurately describe this concept.

Front

Steepness of a line on a graph

Back

Slope

Answer explanation

The steepness or slant of a line on a graph is referred to as the slope. It indicates how much the line rises or falls as you move along the x-axis, making 'slope' the correct choice among the options.

Front

Rate of change of velocity

Back

Acceleration

Answer explanation

The rate at which velocity changes is known as acceleration. It measures how quickly an object's speed or direction changes over time, distinguishing it from speed, which is the magnitude of velocity.

Front

Basic SI unit of length

Back

meter

Answer explanation

The basic SI unit of length is the meter. It is the standard unit used to measure distance in the International System of Units (SI), while liter measures volume, gram measures mass, and Celsius measures temperature.

Front

Relationship between variables with a non-straight line graph

Back

nonlinear

Answer explanation

The term 'nonlinear' describes a relationship between variables whose graph is not a straight line. In contrast, 'linear' indicates a straight-line relationship, making 'nonlinear' the correct choice.

Front

A place or object used for comparison to determine if an object is in motion.

Back

Reference point.

Answer explanation

A reference point is a fixed location or object used to determine if another object is in motion. It provides a basis for comparison, making it the correct choice for this question.

Front

Distance traveled in one time unit.

Back

Speed

Answer explanation

The distance an object travels in one unit of time is defined as speed. Unlike velocity, which includes direction, speed only measures how fast an object is moving.

Front

Relationship between variables with a straight line graph

Back

Linear

Answer explanation

The term 'linear' describes a relationship between variables whose graph forms a straight line. In contrast, 'nonlinear' indicates a curved relationship. Therefore, the correct answer is 'linear'.

Front

The state where one object's distance from another changes.

Back

motion

Answer explanation

The correct answer is 'motion' because it describes the state where one object's distance from another is changing. Other options like velocity and speed relate to how fast something moves, but do not define the changing state itself.

Front

Slipperiest country?

Back

Greece

Answer explanation

Greece is known for its slippery surfaces, particularly in coastal areas where wet stones and tiles can be hazardous. This characteristic makes it the slipperiest country among the options provided.