Velocity/Time Graphs & Acceleration

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LT: I can graph motion on a velocity/time graph from a description of the motion.

• 3D- INDEPENDENTLY- I understand. I can teach a friend. I can even show you more

• 3- INDEPENDENTLY- I understand and can do it by myself

• 2.5- WITH GUIDANCE- I understand most of it, I need help getting started, but I can finish by myself

• 2- WITH GUIDANCE- I understand some and can get started, but I'm a little confused

• 1.5- WITH SUPPORT- I understand a little, but I need help getting started and guidance to help me finish.

What is the definition of acceleration?

Choose 1 correct answer.

• Speed with a direction

• A constant speed over time

• The change in velocity's rate over time

• Returning to the original position

Answer explanation

When graphing motion, acceleration is represented by a line on a velocity/time graph. A positive or negative slope on a velocity time graph represents acceleration because the velocity is changing over time---the velocity is either increasing or decreasing respectively

Tags

acceleration

velocity/time graphs

graphing motion

A flat line of a velocity-time graph represents __________.

Choose all that apply.

• positive acceleration

• constant velocity

• negative acceleration

• no acceleration

Answer explanation

Letter B represents a constant velocity or no acceleration because from 20s-40s, the velocity stays the same (constant) at 40 m/s

Tags

acceleration

velocity/time graphs

graphing motion

What are examples of acceleration?

Choose all that apply.

• a bus speeding up

• sitting in class working on Exact Path

• a falcon changing direction to catch its prey

• slowing down in the hallway to stop at your locker

Answer explanation

Lesson 4 on the Acceleration Notes. Acceleration is a change in velocity's rate (in speed or direction).

a bus speeding up---> = increasing velocity

a falcon changing direction--> =changes direction

slowing down in hallway---> = decreasing velocity

Tags

acceleration

Explain the motion from 1-3s.

Choose 1 correct answer.

• Not moving

• Constant velocity

• Constant acceleration

• Non-constant acceleration

Answer explanation

The line is flat from 1s-3s and a flat line represents constant velocity or no acceleration. The reason why is the velocity (on the y-axis) stays at 8m/s at 1s, 2s, 3s, and then begins to increase after 3s.

Tags

acceleration

velocity/time graphs

graphing motion

Explain the motion from 3-5s.

Choose all that apply.

• Not moving

• Positive Acceleration

• Increase in velocity

• Non-constant acceleration

Answer explanation

On a velocity/time graph, the positive slope represents an increase in velocity. As time increases, velocity also increases. On a distance/time graph, the positive slope means the object is covering a distance at a constant velocity.

Tags

acceleration

velocity/time graphs

graphing motion

Explain the motion from 5-7s.

Choose all that apply.

• Deceleration

• Constant speed

• Negative Acceleration

• Decrease in velocity

Answer explanation

At 5s-7s the line has a negative slope. A negative slope on a velocity graph is a decrease in velocity because as the line moves downward, the velocity also decreases.

Tags

NGSS.MS-PS3-1

What does the line on a velocity/time graph indicate?

Choose 1 correct answer.

• acceleration or velocity

• speed

• only velocity

• direction of travel

Answer explanation

The line on a velocity/time graph is acceleration.

The line on a distance/time graph is speed.

Tags

acceleration

velocity/time graphs

graphing motion

What is an example of velocity?

Choose 1 correct answer.

• 8 m/s

• 8 m/s West

• 8 m

• 8 s

Answer explanation

Velocity is speed with a direction. 8m/s is the speed and West is the direction

Tags

velocity/time graphs

graphing motion

velocity

What is a real world example of deceleration?

Choose 1 correct answer.

• A cheetah speeding up while chasing its prey

• Race cars starting a race and speeding up to pass each other

• Using cruise control in the car to move at a constant speed

• A car slowing down to stop at a red light

Answer explanation

Deceleration is the same as negative acceleration. This means that the speed is decreasing over time. Slowing down is another way to say speed is decreasing over time

Tags

acceleration