Linear Motion — Questions Extraction

A car’s speedometer has an odometer that records the distance traveled. If the odometer reads zero at the beginning of a trip and 35 km a half hour later, what is the average speed?

• 60 km/h

• 70 km/h

• 35 km/h

• 140 km/h

Tags

NGSS.MS-PS3-1

Would it be possible to attain this average speed and never exceed a reading of 70 km/h on the speedometer?

• Yes

• No

If a cheetah can maintain a constant speed of 25 m/s, it will cover 25 meters every second. At this rate, how far will it travel in 10 seconds? In 1 minute? Select all correct statements.

• 250 m in 10 seconds

• 1500 m in 1 minute

• 25 m in 10 seconds

• 600 m in 1 minute

• They have the same speed but opposite velocities.

• They have the same speed and the same velocity.

• They have different speeds but the same velocity.

• They have different speeds and different velocities.

Suppose a car moving in a straight line steadily increases its speed each second, first from 35 to 40 km/h, then from 40 to 45 km/h, then from 45 to 50 km/h. What is its acceleration?

Tags

NGSS.MS-PS2-2

What do we mean when we say that motion is relative, and what is everyday motion usually measured relative to?

• Motion is absolute and usually measured relative to the Sun

• Motion is relative to something and is usually measured relative to Earth

• Motion is constant and usually measured relative to the Moon

• Motion is random and usually measured relative to nearby stars

Speed is the rate at which what happens?

• Time changes

• Distance is covered

• Direction changes

• Acceleration increases

Tags

NGSS.MS-PS3-1

You walk across the room at 2 kilometers per hour. Express this speed using abbreviated units.

• 2 kph

• 2 km/h

• 2 km/hr

• 2 km·h

What is the difference between instantaneous speed and average speed?

• Instantaneous speed is the total distance divided by time; average speed is the speed at any instant

• Instantaneous speed is the speed at any instant; average speed is total distance divided by the time interval

• Instantaneous speed includes direction; average speed does not

• Instantaneous speed is constant; average speed is variable

Does the speedometer of a car read instantaneous speed or average speed?

• Average speed

• Instantaneous speed

• Both, depending on the trip

• Neither

Tags

NGSS.MS-PS3-1