7-2 Review

What term describes the location of an object in a frame of reference?

• Distance
• Displacement
• Position
• Velocity
• Acceleration

Answer explanation

Position is the specific location of an object in a frame of reference, which is necessary to describe its motion.

Which quantity requires both magnitude and direction?

• Distance
• Displacement
• Speed
• Time
• Average speed

Answer explanation

Displacement is a vector quantity because it includes both magnitude (length) and direction.

Distance divided by time is the definition of:

• Average velocity
• Instantaneous velocity
• Average speed
• Constant velocity
• Acceleration

Answer explanation

Average speed is the total distance traveled divided by the total time taken.

Displacement divided by time is the definition of:

• Average speed
• Instantaneous acceleration
• Average velocity
• Constant speed
• Average acceleration

Answer explanation

Average velocity considers displacement rather than distance, making it different from speed.

The rate of change of velocity is:

• Speed
• Velocity
• Displacement
• Distance
• Acceleration

Answer explanation

Acceleration describes how velocity changes over time.

What is the approximate value of acceleration due to gravity on Earth?

• 8.01 m/s²
• 10.98 m/s²
• 9.81 m/s²
• 32.0 m/s²
• 1.68 m/s²

Answer explanation

The standard acceleration due to gravity on Earth is approximately 9.81 m/s².

In a position versus time graph, what does the slope represent?

• Acceleration
• Displacement
• Velocity
• Speed
• Distance

Answer explanation

The slope of a position-time graph represents velocity because it shows how position changes over time.

Motion with constant acceleration is called:

• Variable acceleration
• Uniform acceleration
• Average acceleration
• Instantaneous acceleration

Answer explanation

Uniform acceleration means the acceleration remains the same over time.

If an object is slowing down, the direction of its acceleration is:

• Opposite to its motion
• Same as its motion
• Perpendicular to its motion
• Parallel to its motion

Answer explanation

When an object slows down, its acceleration is in the opposite direction to its velocity.

What is the final velocity of an object with an initial velocity of 4.0 m/s accelerating at a rate of 4.0 m/s² for 2.5 s?

• 4.0 m/s
• 10 m/s
• 14 m/s
• 16 m/s
• 18 m/s

Answer explanation

Using v = v₀ + at, we get v = 4.0 + (4.0 × 2.5) = 14.0 m/s.