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PS_8th_CH9_Motion: Speed & Acceleration

Study Guide 8th PS: Motion Chapter 9 ---Updated 2016-17

  1. Terms from the Chapter- speed, motion, reference point, metric unit for distance and time, acceleration, slope, instant speed vs avearge speed.
  2. Know how to calculate speed, and accelertation and the units for each
  3. What are the differences between speed and velocity?
  4. Know how to draw a vector diagram.
  5. Know how do you calculate speed, velocity and/or acceleration by looking at graph's slope.
  6. Give real life examples of reference points and how they can help or mislead your perception of motion. How to determine motion.
  7. Describe acceleration & negative acceleration.
  8. Two Graphs on Speed, Velocity, Acceleration or Motion to interprit and draw calculations from like WKST from last week. How we graph motion
  9. Have a calculator with you!

 

For homework help click here!

 

Homework for: ________

Step 1: Make a variable list.
Step 2: Write equation.
Step 3: Fill in with numbers and units.
Step 4: Solve.
Step 5: Write answer with units. Circle

1. A boat is traveling at a speed of 36 km per hour. It has to travel
a distance of 210 km. How long will it take?


2. A car takes four hours to reach its destination. The distance was
340 miles. What was its speed?


3. A car travels 300 km in six hours. What is the speed of the car?


4. What is the speed of a jet plane that flies 7200 km in 9 hours?


5. The speed of a cruise ship is 50 km/hr. How far will it travel in
14 hours?


6. The speed of a rocket is 16,000 km/hr, and it will take 66 hours
to complete its mission. How far will it go?


7. What is the speed of a cyclist that travels 60 km in 2 hours?


8. A snail wants to participate in the Boston Marathon, a distance
of 26 miles. His top speed is 0.001 miles per hour. Assuming he
maintains top speed for the entire race, how long will it take him to
finish?


9. A car fills has 1.5 gallons of gasoline left. If the car travels 30
miles before running out of gas, what is the car’s fuel efficiency in
miles/gallon?

9-1 Speed Caluclations: Do the following assignment on theme paper.

  1. After drawing a vector diagram for the problem
  2. Write the formula for speed
  3. Then plug-in your variable'svalues
  4. Lastly, solve & show all work and Circle your answers!

1.Calculate the speed for a car that went a distance of 125 km in 2 hours time.

2.A baseball is thrown a distance of 60 m. What is its speed if it takes 0.5 seconds to cover the distance?

3.How much time does it take for a bird flying at a speed of 45 km per hour to travel a distance of 1,800 km?

4.A comet is cruising through the solar system at a speed of 50,000 kilometers per hour for 4 hours time. What is the total distance traveled by the comet during this time?

5.A coach wants to find out the speed of the runners on a track team. Tell what simple equipment the coach needs in order to do this and explain how it should be done. If you look at the triangle formula, you ‘ll see that you need to know the time and distance in order to calculate speed. Think of some typical equipment used to measure each equipment needed: What should be done :

6.Sally decided to drive to her grandmother’s house. She drove 117 km in 2 hours, what was her average speed?

7.Help Jimmy figure out how far he drove. He knew that his average speed was 75 km/h and that he drove 6 hours. How far did he drive?

8.If Jamie wants to arrive at her aunt’s house on time for dinner, when will she need to leave her apartment if she only drives the speed limit (65 km/h) and her aunt lives 30 miles away.

9.Henry drove for one hour. During that time he looked down at the speedometer every 5 minutes to make sure he was driving the speed limit. If the speed limit is 65 km/h, explain why Henry had driven only 50 km during that time.

10. Pavel drove 200 km in 3 hours in the morning then got hungry and stopped at McDonalds for 30 minutes to eat a Big Mac. He finished his trip driving 240 km in 4 hours.

  1. What was Pavel’s speed in the morning?
  2. What was Pavel’s speed after lunch? Did he have a stomach ache?
  3. What was Pavel's average speed for the trip?

9-3 Acceleration Calculations: Do the following assignment on theme paper.

  1. After drawing a vector diagram for the problem
  2. Write the formulas for speed and acceleration.
  3. Then plug-in your variable'svalues
  4. Lastly, solve & show all work and Circle your answers!

 

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1 Donovan has been running at a pace of 30 m/min S he is starting to feel tired and slows his pace down to a15m/minS for he felt a bit winded. What is his acceleration if it takes him 3mins to do this?

 

 

2 Dominika was playing a wicked game of kick ball. The pitcher rolled the ball to her at home plate at a rate of 5m/s N. She belted the ball when it came to her and the ball was clocked at 25m/s S. It took 3 sec. for the ball to accelerate. But, what was the acceleration.

3 My cat Tavarua an excellent hunter was out in the yard hunting. Then scampered toward a bird and the chase was on. She chased this bird for 10seconds. This bird was flying at a rate of 10km/s S it for it was flustered by the Tavy chasing it. In its frenzy the bird flew towards the opening in the house to escape the cat. Then it happened the bird flew right into the glass sliding door. Was there negative acceleration? What was it?

4 Tye is driving his pick-up at 30km/hr, when in the distance he saw the railroad signal start to flash and gates go down. He depressed the brake and slowed to a rate 5km/hr. It took him 3 sec to do this. Solve for acceleration.

5 Mrs. Furlong is running down the street at 10 meters per second. She sees a double-tall latte on the road ahead of her and starts sprinting. After 5 seconds have passed, she is running at 15 meters per second. Assuming she does not change direction, what was her acceleration?

6 Two ants race across a table 50cm long. One travels at 4cm/s and the other at 2cm/s. When the first one crosses the finish line, how far behind is the second one?

7 Lance bike up and down the hills of France, He started when he reached the top of a hill he was moving at .5 km/min. It took him 2mins to glide down this hill. But, in that 2mins he reached a velocity of 1 km/min. Will he fall if there is a small pebble at the bottom on the hill? And what was his acceleration during this time interval.

 

MORE Acceleration Calculations: Do the following assignment in NTBK like class paper.

  1. After drawing a vector diagram for the problem
  2. Write the formulas for speed and acceleration.
  3. Then plug-in your variable'svalues
  4. Lastly, solve & show all work and Circle your answers!

1. A roller coaster car rapidly picks up speed as it rolls down a slope. As it starts down the slope, its speed is 4 m/s. But 3 seconds later, at the bottom of the slope, its speed is 22 m/s. What is its average acceleration?

2. A cyclist accelerates from 0 m/s to 8 m/s in 3 seconds. What is his acceleration? Is this acceleration higher than that of a car which accelerates from 0 to 30 m/s in 8 seconds?

3. A car advertisement states that a certain car can accelerate from rest to 70 km/h in .002 of an hour. Find the car’s average acceleration.

4. A lizard accelerates from 2 m/s to 10 m/s in 4 seconds. What is the lizard’s average acceleration?

5. If a Ferrari, with an initial velocity of 10 m/s, accelerates at a rate of 50 m/s/s for 3 seconds, what will its final velocity be?  Use algebra.