Gen Ch 2 Intro Motion

Average speed is defined as the time it takes for a trip divided by the distance.

• True 
• False

Velocity is different from speed in that velocity is speed in a given direction.

• True
• False

When a car rounds a corner at a constant speed, its acceleration is zero.

• true
• false

Speed is

• A measure of how fast something is moving
• always measured in terms of a unit of distance divided by a unit of time
• the distance covered per unit time
• all of the above

One possible unit of speed is 

• miles per hour
• light years per century
• kilometers per hour
• all of the above

When you look at the speedometer in a moving car, you can see the car's 

• average distance traveled
• instantaneous acceleration
• average speed
• instantaneous speed

Suppose you are in a car that is going around a curve. The speedometer reads a constant 30 miles per hour. Which of the following is NOT true?

• You and the car are accelerating.
• Your acceleration is constantly changing.
• Your velocity is constant.
• Your speed is constant.

In the absence of air resistance, objects fall at constant 

• speed
• velocity
• acceleration
• all of the above

What is the resultant of these two vectors?

• +2a
• 0
• -2a
• +a

What is the difference between distance and displacement?

• Displacement s only a scalar

• Distance is a vector and displacement is a scalar

• Distance is a scalar and displacement is a vector

• Distance is only a vector