# 8th Grade Science Quiz On Motion! Trivia

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| By Chrisv1812
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Chrisv1812
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Questions: 8 | Attempts: 1,560

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• 1.

### _________ occurs when the velocity of an object changes.

• A.

Acceleration

• B.

Velocity

• C.

Speed

• D.

Distance

A. Acceleration
Explanation
Acceleration occurs when the velocity of an object changes. It is a measure of how quickly an object's velocity is changing over time. When an object speeds up, slows down, or changes direction, it is experiencing acceleration. This can be caused by a force acting on the object, such as gravity or friction. Acceleration is a vector quantity, meaning it has both magnitude (the rate of change of velocity) and direction. It is commonly measured in meters per second squared (m/s^2).

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• 2.

### When you say that a race car travels northward at 100 km/h, you are talking about its _________

• A.

Velocity

• B.

Distance

• C.

Acceleration

• D.

Speed

D. Speed
Explanation
When you say that a race car travels northward at 100 km/h, you are referring to its speed. Speed is a scalar quantity that represents how fast an object is moving, without considering the direction. In this case, the direction is mentioned (northward), but it does not affect the definition of speed. Velocity, on the other hand, is a vector quantity that includes both speed and direction. Distance is a scalar quantity that represents the total length covered by an object, regardless of its direction. Acceleration refers to the rate at which an object's velocity changes over time.

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• 3.

### If a train is slowing down, it is accelerating

• A.

True

• B.

False

A. True
Explanation
When a train is slowing down, it means that its velocity is decreasing. Acceleration is defined as the rate of change of velocity. Since the train is changing its velocity, even if it is decreasing, it is still undergoing acceleration. Therefore, the statement "if a train is slowing down, it is accelerating" is true.

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• 4.

### What is the distance a measure of?

• A.

Width

• B.

Length

• C.

Hieght

• D.

Area

B. Length
Explanation
Distance is a measure of length. It refers to the amount of space between two points or objects. Length is a fundamental concept in geometry and is commonly used to describe the size or extent of an object in one dimension. In terms of physical quantities, distance is often measured using units such as meters or kilometers.

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• 5.

### What unit is the distance measured in?

• A.

Meters

• B.

Grams

• C.

Inches

• D.

Quarts

A. Meters
Explanation
The distance is typically measured in meters. Meters are a unit of length in the metric system and are commonly used to measure distances. They are a standard unit of measurement in most scientific and engineering fields.

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• 6.

### Speed in a given direction is...

velocity
Explanation
Speed in a given direction is referred to as velocity. Velocity is a vector quantity that includes both the magnitude (speed) and the direction of an object's motion. It describes how fast an object is moving and in which direction it is moving. Therefore, velocity is the appropriate term to describe speed in a given direction.

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• 7.

### The basic SI unit of length is the...

meter
Explanation
The basic SI unit of length is the meter. The meter is defined as the distance traveled by light in a vacuum in 1/299,792,458 of a second. It is widely used in scientific and everyday measurements around the world.

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• 8.

### Scientists around the world use the ________, a system of measurements based on the number ten.

ISU

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• Current Version
• Mar 22, 2023
Quiz Edited by
ProProfs Editorial Team
• Mar 08, 2010
Quiz Created by
Chrisv1812

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