Year 10 term 3 formative test 1

Which of the following is a vector quantity?

• Speed

• Distance

• Velocity

• Temperature

Answer explanation

Velocity is a vector quantity because it has both magnitude and direction, unlike speed and distance, which are scalar quantities. Temperature is also a scalar, making velocity the only vector option here.

Which of the following is a scalar quantity?

• Displacement

• Force

• Distance

• Acceleration

Answer explanation

Distance is a scalar quantity as it only has magnitude and no direction. In contrast, displacement, force, and acceleration are vector quantities, which have both magnitude and direction.

What is the main difference between speed and velocity?

• Speed has direction, velocity does not

• Velocity has direction, speed does not

• Both have direction

• Neither has direction

Answer explanation

The main difference is that speed is a scalar quantity, meaning it only measures how fast an object is moving, while velocity is a vector quantity that includes both speed and direction. Therefore, velocity has direction, speed does not.

If a car travels 150 km in 3 hours, what is its average speed?

• 50 km/h

• 45 km/h

• 53 km/h

• 150 km/h

Answer explanation

To find the average speed, divide the total distance by the total time. Here, 150 km ÷ 3 hours = 50 km/h. Thus, the average speed of the car is 50 km/h.

Which formula correctly calculates average speed?

Answer explanation

Average speed is calculated by dividing the total distance traveled by the total time taken. Therefore, the correct formula is Average speed=distance/time

If the average speed is 60 km/h and the time taken is 2 hours, what is the distance travelled?

Answer explanation

To find the distance travelled, use the formula: Distance = Speed × Time. Here, Distance = 60 km/h × 2 h = 120 km. Therefore, the distance travelled is 120 km.

Answer explanation

To make time the subject, rearrange the formula by multiplying both sides by time and then dividing by average speed. This gives time = distance / average speed, which is the correct choice.

A runner completes 400 metres in 50 seconds. What is their average speed in m/s and km/h?
(Give your answer as number and number for example 3 and 6)

Answer explanation

Average speed is calculated as distance divided by time. Here, 400 metres in 50 seconds gives 8 m/s. To convert to km/h, multiply by 3.6, resulting in 28.8 km/h. Thus, the average speed is 8 and 28.8.

Which of the following statements is true about scalar quantities?

• They have both magnitude and direction

• They have only magnitude

• They have only direction

• They have neither magnitude nor direction

Answer explanation

Scalar quantities are defined as having only magnitude, meaning they can be described by a numerical value alone, without any directional component. Therefore, the correct statement is that they have only magnitude.

On a distance-time graph, what does a horizontal line represent?

• Constant speed

• Increasing speed

• Stationary object

• Decreasing speed

Answer explanation

A horizontal line on a distance-time graph indicates that the distance does not change over time, meaning the object is stationary. Therefore, the correct answer is 'Stationary object'.