Motion

Motion

Describing Motion

Volunteer

Wait outside the door for 30 seconds.

Describing Position

In order to describe an objects position, you must use a reference point for comparison.

Open Ended

How can you describe Ms. Calvo's position?

Displacement

• The difference between the initial and final position

Multiple Choice

What distance does the bus travel from position 5 to position 6?

• 20 m

• 60 m

• 10 m

• 40 m

Multiple Choice

Jerry walked from home to school, then from the school to the park. What is his total displacement?

• 2 km

• 5 km

• 8 km

• 10 km

Multiple Choice

Jerry walked from home to school, then from the school to the park. What is his total distance?

• 2 km

• 5 km

• 8 km

• 10 km

Multiple Choice

Bill runs 400 meters to Andy's house, turns around, and runs 400 meters back home. What is Bill's displacement?

• 0 meters

• 400 meters

• 800 meters

• 1600 meters

Multiple Choice

Scott travels north 5 miles and then goes west 3 miles before coming straight back south 2 miles. What is his distance?

• 10

• 7

• 8

• 6

Motion

• The process of changing positions

Speed, Velocity, & Acceleration

How are they different?

Learning Objective

Know what speed, velocity, and acceleration are. Understand how they are different. Be able to calculate speed, distance, time, and acceleration

Speed

Speed is the measure how quickly distance changes with time.

Constant Speed: distance traveled in a unit of time stays the same

Changing Speed: when and object moves a greater or less distance in the same amount of time

Average Speed: total distance traveled divided by the total time

Average speed = total distance / total time

Using Equations to Solve for Speed, Distance, & Time

• Distance = speed x time

• Time = distance / speed

• Speed = distance / time

Multiple Choice

Find the speed of Ms. Calvo after 40 sec at 8 meters.

• 5 m/s

• 8 m/s

• 5 mph

• 0.2 m/s

Multiple Choice

The average speed on the highway is 60mph and it is 30 miles from Miami Beach to Kendall. How long will it take to get to Miami Beach if I leave at 4pm?

• 5 min

• 30 min

• 5 hr

• 30 sec

Velocity

• Velocity of an object is its speed combined with the direction of the motion.

• Just add the direction to the speed and you have velocity

• An example of velocity would be 70mph south

Multiple Select

Check the correct examples of velocity

• 60 km/hr

• 20 mph East

• 30 m/s up

• 2.7 mph

• 45 km/her South

Changing Velocity

Changes in speed or direction of an object in motion.

Multiple Choice

How is velocity different than speed?

• Speed opposes velocity

• Velocity is speed with a direction

• None of the answers are correct

Acceleration

• Acceleration is a measure how quickly velocity changes.

• Acceleration describes the change in velocity over time.

Acceleration

• Can be negative (deacceleration or slowing down)

• Goes in opposite direction of velocity

• Can be positive (speeding up)

• Goes in same direction of velocity

Brain POP

https://www.brainpop.com/science/motionsforcesandtime/acceleration/

Multiple Choice

Acceleration only takes place when things speed up.

• True

• False

Multiple Choice

Why does a car accelerate as it round a corner at a constant speed?

• Its direction changes

• It doesn't

• It slows down

• Its speeds up

Multiple Choice

In each of the following cases, determine where the car has no acceleration ?

• A car shortly after a stoplight turns green.

• A car approaching a red light

• A car with the cruise control set at 80 km/h

• A car turning a curve at a constant speed