Unit 4RetestNewton’s Laws & Force DiagramsName:

You ONLY Need to redo the objectives you want to retest. Before you start doing the objectives, check to see if you are eligible:

ALL the objectives on Ilearn were completed with 100% on ALL objectives _____ Yes

I completed the Review Newton's Laws ____ Yes (due the day of the test)

I completed Newton's 3rd Law Force Pairs WS ____ Yes

I completed Newton's 2nd Law WS F=ma WS (10 questions) ____ Yes

I completed Force Diagram WS ____ Yes

If you did not check yes for all of the above, you are NOT eligible to retest.

  1. I can identify the force(s) acting between objects in direct contact or at a distance.

A) A Boy throws a football in the air. What are the forces acting on the ball? Ignore air resistance.

a. ______

B) A girl pushes a cart down the aisle in the grocery store. Ignore friction, what are the forces acting on the grocery cart?

a. ______

b. ______

c. ______

C) A air hockey puck is hit towards the goal. As the puck is sliding (no friction) what are the forces on the puck?

a. ______

b. ______

  1. I can predict the change in motion of an object acted on by several forces.

A) After the air hockey puck is struck (no friction) what is true of the puck? Choose 1 answer:

a. moves at constant speed.

b. slows down gradually to a stop.

c. speeds up for a bit, then moves at constant speed.

d. accelerates constantly.

B) A rocket in outer space fires an engine. What is true of the rocket? Choose 1 answer.

a. moves at constant speed.

b. slows down gradually to a stop.

c. speeds up for a bit, then moves at constant speed.

d. accelerates constantly.

  1. I can identify the action and reaction force from everyday examples.

A) A water bottle is sitting on a table, it applies a force on the table. What is the reaction to the force?

B) Joe pushes a chair across the floor. Joe applies a force to the chair. What is the pair to this force?

  1. I can identify the magnitude and direction of everyday forces (wind, weight, tension, pushes, pulls).

Please go to the following web site and complete the interactive. Sketch the 12 diagrams of the problems below – label all arrows Make sure they are legible.

  1. I can identify forces acting on objects moving with constant velocity.

The person is pulled upward at constant speed. Draw a force diagram to show the forces on the person being pulled up.

The box is pushed at a constant velocity by a force parallel to the surface. Draw a force diagram to show the forces on the box.

An air hockey puck (no friction) was struck and is moving across the air hockey table. Draw a force diagram for the puck.

  1. I can calculate the net force acting on an object.

Calculate the net force for each of the following problems. Your answer should have a number, a unit and a direction.

A boy pulls awagonwith a force of 6 N east as another boy pushes it with aforceof4N

east. Whatisthenetforce?

Mr.Smithandhiswifeweretryingtomovetheirnewchair.Mr.Smithpullswithaforce

of30NwhileMrs.Smithpusheswithaforceof25Ninthesamedirection.Whatisthenet

force?

Theclassesare playingtugofwar.Mrs.Larson’shomeroompullswithaforceof50N.

Ms.Mitko’shomeroompullswithaforceof45Nintheoppositedirection.Whatisthenet

force?Andwhowon?

  1. I can solve problems involving force, mass and acceleration in linear motion (Newton’s second law).

An object with a mass of 2.0 kg accelerates 2.0 m/s2 when an unknown force is applied to it. What is the amount of the force? ______

An object with a mass of 5.0 kg accelerates 8.0 m/s2 when an unknown force is applied to it. What is the amount of the force? ______

An object with a mass of 1500 g (grams) accelerates 10.0 m/s2 when an unknown force is applied to it. What is the amount of the force? ______

An object accelerates 3.0 m/s2 when a force of 6.0 newtons is applied to it. What is the mass of the object? ______

An object accelerates 12.0 m/s2 when a force of 6.0 newtons is applied to it. What is the mass of the object? ______

An object accelerates 5.0 m/s2 when a force of 20.0 newtons is applied to it. What is the mass of the object? ______

An object with a mass of 2.0 kg has a force of 4.0 newtons applied to it. What is the resulting acceleration of the object? ______

An object with a mass of 5.0 kg has a force of 20.0 newtons applied to it. What is the resulting acceleration of the object? ______

An object with a mass of 20.0 kg has a force of 5.0 newtons applied to it. What is the resulting acceleration of the object? ______