Forces in two dimensions

Last updated almost 8 years ago

22 questions

Note from the author:

Contest - This assignment is meant to take at least three 50 min class periods, during which students will explore the concepts of balanced and unbalanced forces and explain how forces acting on an object cause a change in position (MS-PS2-2). 
In hyperdoc fashion, it is arranged in different sections (Engage, Explore, Explain, Apply, Share). It makes use of two Flipgrids (open to all), as well as the Motion and Forces Phet sim and concludes with an assessment that asks students to revisit their original explanation from the Engage section.

Forces in two dimensions

Forces in two dimensions

How can one predict an object’s continued motion, changes in motion, or stability?

Engage

Explore - What is a Force?

What is a force?

What do we use to represent forces in a force diagram?

What forces are acting on you right now?

Measuring forces

Use a diagram to explain your understanding of balanced forces.

Use a diagram to explain your understanding of unbalanced forces.

Give an example of a balanced force; then explain what would happen if the force became un-balanced.

Explain

Explain your understanding of combining forces.

Apply

TASK 1 a. Place 2 people of the same size at the same distance away from the cart. b. Make a prediction about the movement of the cart. (Record it on the data chart)c. AFTER you have observed the actual movement, click on the sum of the forces box at the top right hand corner of the simulation.

TASK 3 a. Place 2 people of different sizes but the same distance away from the cart. b. Make a prediction about the movement of the cart. c. AFTER you have observed the actual movement, click on the sum of the forces box at the top right hand corner. Record the number in the data chart.

Share

What causes objects to move or stay still?

Balanced forces cause a change in motion.

You exert a force of 120 N on a desk. Your friend exerts a force of 150 N in the same direction. What net force do you and your friend exert on the desk?

You exert a force of 120 N on a desk. Your friend, not very brightly I may add, decides to push the desk from the opposite direction, exerting a force of 150 N. What net force do you and your friend exert on the desk? What will be the direction of the movement?

If gravity pulls you towards the centre of the Earth, why don't you fall through the pavement?

All of the following statements are true, except...

Calculate the net force and describe the direction of movement. (i.e. The weelbarrow will move to the ______ with a net force of _______ N)

Will this rocket be able to lift off? Explain your answer using your net force calculations

When finding net force, why must you know the directions of the forces acting on an object?

Go back to the explanation you provided at the beginning of this assignment (Tug of War Flipgrid). Label the forces needed ensure that your original explanation was in fact correct.

How can one predict an object’s continued motion, changes in motion, or stability?

Engage

Explore - What is a Force?

What is a force?

What do we use to represent forces in a force diagram?

What forces are acting on you right now?

Measuring forces

Use a diagram to explain your understanding of balanced forces.

Use a diagram to explain your understanding of unbalanced forces.

Give an example of a balanced force; then explain what would happen if the force became un-balanced.

Explain

Explain your understanding of combining forces.

Apply

TASK 1 a. Place 2 people of the same size at the same distance away from the cart. b. Make a prediction about the movement of the cart. (Record it on the data chart)c. AFTER you have observed the actual movement, click on the sum of the forces box at the top right hand corner of the simulation.

TASK 3 a. Place 2 people of different sizes but the same distance away from the cart. b. Make a prediction about the movement of the cart. c. AFTER you have observed the actual movement, click on the sum of the forces box at the top right hand corner. Record the number in the data chart.

Share

What causes objects to move or stay still?

Balanced forces cause a change in motion.

You exert a force of 120 N on a desk. Your friend exerts a force of 150 N in the same direction. What net force do you and your friend exert on the desk?

You exert a force of 120 N on a desk. Your friend, not very brightly I may add, decides to push the desk from the opposite direction, exerting a force of 150 N. What net force do you and your friend exert on the desk? What will be the direction of the movement?

If gravity pulls you towards the centre of the Earth, why don't you fall through the pavement?

All of the following statements are true, except...

Calculate the net force and describe the direction of movement. (i.e. The weelbarrow will move to the ______ with a net force of _______ N)

Will this rocket be able to lift off? Explain your answer using your net force calculations

When finding net force, why must you know the directions of the forces acting on an object?

Go back to the explanation you provided at the beginning of this assignment (Tug of War Flipgrid). Label the forces needed ensure that your original explanation was in fact correct.

TASK 1
a. Place 2 people of the same size at the same distance away from the cart.
b. Make a prediction about the movement of the cart. (Record it on the data chart)
c. AFTER you have observed the actual movement, click on the sum of the forces box at the top right hand corner of the simulation.

TASK 3
a. Place 2 people of different sizes but the same distance away from the cart.
b. Make a prediction about the movement of the cart.
c. AFTER you have observed the actual movement, click on the sum of the forces box at the top right hand corner. Record the number in the data chart.

Calculate the net force and describe the direction of movement. (i.e. The weelbarrow will move to the with a net force of _ N)

TASK 1
a. Place 2 people of the same size at the same distance away from the cart.
b. Make a prediction about the movement of the cart. (Record it on the data chart)
c. AFTER you have observed the actual movement, click on the sum of the forces box at the top right hand corner of the simulation.

TASK 3
a. Place 2 people of different sizes but the same distance away from the cart.
b. Make a prediction about the movement of the cart.
c. AFTER you have observed the actual movement, click on the sum of the forces box at the top right hand corner. Record the number in the data chart.

Calculate the net force and describe the direction of movement. (i.e. The weelbarrow will move to the with a net force of _ N)