Motion Review ClassworkName: ______

Classwork #1

5thGrade PSI

  1. What are possible units for measuring how far away the grocery store is from your house? What are you measuring?
  1. What are possible units for measuring how long it takes you to drive to the grocery store from your house? What are you measuring?
  1. Who will cover the longest distance: someone who walks for 10 minutes or someone who drives a car for 10 minutes?
  1. You live within walking distance of your post office. When you walk at a speed of 4 miles/hour, it takes you 1.5 hours to reach the post office. How far away is the post office?
  1. Florence Griffith Joyner was a track and field athlete. She is known as the fastest woman of all time. In 1988, she ran the 100 meter dash in 10.49 seconds.
  2. What was her speed for this race?
  1. If she maintained this speed, how long would it take her to run a kilometer (1000 meters)?

Motion Review HomeworkName: ______

Homework #1

5thGrade PSI

  1. The Daytona 500 is a NASCAR race. In this race, the competitors drive 200 laps around the track to equal 500 miles. Joey Logano won the February 22, 2015 race. During the race, he averaged about 162 miles per hour. How long did it take him to drive the race?
  1. Eagles can fly at speeds up to 55 miles per house but when they dive towards the ground to catch prey, they can move much faster. Suppose that an eagle is flying 2.5 miles above the ground. It suddenly dives down towards the ground and catches its prey in just 0.025 hours. What was the speed of the eagle as it dove to the ground?
  1. Your dad wants to find out how far he can travel in his new car on one tank of gas. He fills the gas tank and starts driving, maintaining a speed of 35 miles per hour. Twelve hours later, the car putters to a stop. How many miles did he drive on that one tank of gas?

Contact Forces ClassworkName: ______

Classwork #2

5th Grade PSI

Describe each contact force below and give an example.

  1. Applied Force
  1. Frictional Force
  1. Normal Force
  1. Suppose that a bowling ball is moving at 10 mph and is experiencing balanced forces. How will these balanced forces affect the ball?
  1. Describe the net force in the following examples. Describe each as having either balanced or unbalanced forces.

Contact Forces HomeworkName: ______

Homework #2

5th Grade PSI

For #1-3, each description is an example of a contact force. Write the name of that contact force on the line beside each description.

  1. ______Your laptop is on top of the kitchen counter. The

counter pushes up against the laptop.

  1. ______You push a wheelbarrow of mulch through your yard.
  1. ______As a pitcher throws a baseball to the catcher, the air

pushes against the baseball, slowing it down.

  1. Your parents buy you a skateboard for your birthday. When you try to ride it on the asphalt outside your house, you have a hard time going very fast. What is slowing you down? Where would be a better place to ride?
  1. Draw a picture of a balanced force and an unbalanced force below. Write the net force below each picture.

Non-Contact Forces ClassworkName: ______

Classwork #3

5th Grade PSI

  1. What happens to the strength of a magnetic field as you travel farther away from it?
  1. Draw a magnetic field around the magnet below to show the direction the field travels.
  1. State whether the objects in each example will be attracted to or repelled by each other. Write the net charge in the box below each one.

Non-Contact Forces HomeworkName: ______

Homework #3

5th Grade PSI

  1. Draw two magnets in such a manner that they are repelling each other. Draw the magnetic fields surrounding the magnets.
  1. Two factors affect the strength of an electric field. What are they?
  1. Give an example of how charges can be transferred from one object to another.
  1. Each circle below indicates an object. Fill the circles with as many negative and positive charges as you would like in order to illustrate an electric field that is attracted to each other. Write the net charge of each circle in the box below.

Gravity ClassworkName: ______

Classwork #4

5th Grade PSI

  1. What is a gravitational force? How is it different from a magnetic or electric force?
  1. Does the Earth exert a gravitational force on the moon? Why does the moon not fall down to the Earth?
  1. The statements below describe the contributions of three scientists to the study of gravity. Write the name of the scientist on the line beside each statement.
  1. ______Applied mathematics to gravity. Described the

properties of gravitational force.

  1. ______Observed gravity and concluded that heavier

objects fall faster than lighter objects.

  1. ______Conducted experiments at the Tower of Pisa

and discovered that similar sized objects of different weights fell at the same speed.

  1. The table shows different objects that are dropped alternately from the top of a skyscraper and in a vacuum tube. Predict which item will hit first when dropped from these locations. Be able to explain your answer.

Which item will hit first when dropped:
Items / From a skyscraper / In a vacuum tube
A feather and a brick
A Styrofoam ball and a bowling ball (both 8.5” diameter)

Gravity HomeworkName: ______

Homework #4

5th Grade PSI

  1. Summarize Newton’s Properties of Gravitational Force.
  1. Rank the following animals based on the size of their gravitational force, from smallest to largest force: whale, ladybug, horse, dog.
  1. The images below show the gravitational fields between two object at varying distances. Place a star next to the image that shows the weakest gravitational field. Circle the image that shows the strongest gravitational field.
  1. An apartment building downtown is on fire. Firemen are standing on the top floor, throwing items out of the window, two items at a time. Explain which item will hit the ground first in each grouping.
  2. A basketball and a bowling ball of the same circumference
  1. A piece of paper and a brick

Answer Key

Motion Review Classwork

Classwork #1

  1. Miles (any distance measurement is acceptable). You are measuring distance.
  2. Seconds, minutes, etc. (any time measurement is acceptable). You are measuring time.
  3. The driver will be travelling at a higher speed and will therefore cover more distance in the same amount of time.
  4. Speed = distance / time

4 miles/hr = distance / 1.5 hours

6 miles = distance

  1. Speed = distance / time

Speed = 100 m / 10.49 s

Speed = 9.53 m/s

  1. Speed = distance / time

9.53 m/s = 1000 m / time

Time = 105 s

Motion Review Homework

Homework #1

  1. Speed = distance/time

162 mph = 500 miles / time

3.09 hours = time

  1. Speed = distance / time

Speed = 2.5 miles / 0.025 hours

Speed = 100 mph

  1. Speed = distance / time

35 mph = distance / 12 hours

420 miles = distance

Contact ForcesClasswork

Classwork #2

  1. Applied force – a push or pull. Examples will vary.
  2. Frictional force – a force that moves against an object’s motion. Examples will vary.
  3. Normal force – the force of a stable object. Examples will vary.
  4. The bowling ball will continue to move at 10 mph. (When an object is experiencing balanced forces, it will not move or – if it is already moving – it will continue to move at a constant speed.)
  5. 5 N to the left
  6. 0 N
  7. 8 N to the right

Contact ForcesHomework

Homework #2

  1. Normal
  2. Applied
  3. Frictional
  4. The frictional force of the asphalt pushing against the motion of the skateboard is slowing you down. You should find somewhere smoother to ride, such as the sidewalk.
  5. Examples will vary. The balanced force should have a net force of zero. The unbalanced force should have a net force pointing in one direction.

Non-Contact Forces Classwork

Classwork #3

  1. As you travel away from a magnetic field, its strength decreases.
  2. The magnetic field should be flowing from the N side to the S side.
  3. Attracted

Net charges: +1, -1

  1. Repelled

Net charges: -2, -1

Non-Contact Forces Homework

Homework #3

  1. Two magnets should be placed with either the north sides facing each other or the south sides facing each other. The lines of the magnetic field should be moving from the north to the south on each magnet, with the two individual magnets completely avoiding each other.
  2. Two factors that affect the strength of an electric field are distance and magnitude. As distance increases from an electric field, the strength decreases. The larger the charge of an electric field, the stronger the electric field will be.
  3. Answers will vary. In general, when two objects are rubbed together, electrons will transfer from one object to another. The object that gains the electrons will become negatively charged while the object that loses electrons will become positively charged.
  4. Answers will vary. One circle should have a positive net charge while the other should have a negative net charge.

Gravity Classwork

Classwork #3

  1. Gravitational force occurs when two bodies physically attract each other by pulling. Magnetic and electric forces can either repel or attract. Gravitational force only attracts.
  2. Yes, the Earth exerts a gravitational force on the moon. The moon does not fall down to the Earth because it is moving with perpendicular velocity. It moves to the side but is constantly pulled down to Earth. This makes it move in a circle around the Earth.
  3. Newton
  4. Aristotle
  5. Galileo

Which item will hit first when dropped:
Items / From a skyscraper / In a vacuum tube
A feather and a brick / Brick / Both will hit together.
A Styrofoam ball and a bowling ball (both 8.5” diameter) / Both will hit together. / Both will hit together.

Gravity Homework

Homework #4

  1. Gravitational force is an attractive force. The force increases as objects get bigger.
  2. Every object creates a gravitational field.
  3. The distance between centers of the gravitational field changes the strength of the field. Closer fields are stronger.
  4. Ladybug, dog, horse, whale
  1. .
  1. They will hit at the same time. Since they are the same size, the gravitational force and frictional force are the same. They will fall at the same speed.
  2. The brick will hit first. The Earth pulls each item with the same gravitational force, but the piece of paper will experience more air friction.

PSIForces