BR #17: 1D UAM

A quantity that is has magnitude and  direction is referred to as a

• vector quantity
• scalar quantity

A bike accelerates uniformly from rest to a speed of 7.10 m/s over a distance of 35.4 m.

What is the initial velocity of the bike?

• v₀ = 0m/s

• v₀ = 7.10m/s

• v₀ = 35.4m

• v₀ = ?

A change in velocity over time is known as:

• acceleration
• constant speed
• average speed
• displacement

What is this graph representing?

• Constant Speed

• Positive Acceleration (speeding up)

• Negative Acceleration (slowing down)

• No motion

Which graph represents zero acceleration (constant velocity)?

• A
• B
• C
• D

Which runner won the race?

• A
• B
• C

A dog runs with an initial speed of 7.5 m/s to a stop in 15 seconds.  What is the dog's acceleration?

• -7.5 m/s
• -7.5 m/s²
• -0.5 m/s²
• 7.5 mi//hr

As represented by this position-time graph, this object is ____.

• speeding up, changing directions, and then slowing down
• accelerating, first with a positive and then with a negative acceleration
• speeding up and then slowing down, all while moving in the same direction
• moving in the positive direction and then in the negative direction, both at constant speed

As represented by this velocity-time graph, this object is ____.

• at rest for several seconds and then accelerates in the negative direction
• moving at a constant speed and then slowing down
• at rest for several seconds and then moves in the negative direction
• ... nonsense! None of these appropriately describe the object's motion

Acceleration only takes place when things speed up. 

• True
• False