Unit II Problem Solving Worksheet
This assignment will allow you to demonstrate the following objectives:
•
Illustrate the scientific method within everyday situations.
o Identify the appropriate formulas necessary to solve specific scenario questions.
o Calculate and analyze the acceleration and the force in various situations.
•
Explain Newton's laws of motion at work in common phenomena.
o Solve problems using mass and weight.
o Explore the relationship between the first and second laws.
o Identify action-reaction pairs in the third law.
Instructions: Choose 8 of the 10 problems below. Show your work in detail. Answer the questions directly in this
template. Before doing this, it is highly recommending that you thoroughly review the three examples in the Unit Lesson.
1. Susan pushes her dad, David, on an ice rink with a force of 30 N. She weighs 45 kg and her dad weighs 100 kg.
What are the accelerations of Susan and David?
Hint: For an example of this problem being worked out click here.
To view a transcript of this video, click here.
Click here for a PowerPoint version of the video.
To view a transcript of this PowerPoint click here.
2.
Alice holds a black belt in Taekwondo and her fist has a mass of 0.5 kg. Her fist obtains a velocity of 5 m/s in 0.1
seconds from rest. Evaluate the average net force applied to the fist.
Hint: For an example of this problem being worked out click here.
To view a transcript of this video, click here.
Click here for a PowerPoint version of the video.
To view a transcript of this PowerPoint click here.
3. A lunar exploration vehicle was created by a research team. It weighs 3,000 kg on the earth. It needs an
acceleration of 10 m/s2 on the moon. In order to have the same acceleration, what will be the net force acting on
the vehicle on the earth?
To view a transcript of this video, click here (Unit II PS_3.docx). Also, click here(Unit II PS_3.pptx) to review the
power point presentation.
Hint: For an example of this problem being worked out click here.
To view a transcript of this video, click here.
Click here for a PowerPoint version of the video.
To view a transcript of this PowerPoint click here.
Unit II Problem Solving Worksheet
4. Three people are pushing a 500 kg of box in the same direction. Applied forces are 30 N, 20 N,
and 10 N respectively. If the acceleration of the box is 0.02 m/s 2, what is the magnitude of a force created by
friction?
30 N
?
20 N
10 N
Hint: For an example of this problem being worked out click here.
To view a transcript of this video, click here.
Click here for a PowerPoint version.
To view a transcript of this PowerPoint click here.
5. You drive a 6,000 kg boat due north, while the wind exerts a force of 600 N due south and the water exerts a
resistive force of 1,200 N due south. The generated force by the boat’s engines is 4,200 N. Find the magnitude
and direction of the boat’s acceleration.
Hint: For an example of this problem being worked out click here.
To view a transcript of this video, click here.
Click here for a PowerPoint version of the video.
To view a transcript of this PowerPoint click here.
6.
A machine accelerates a 5 kg missile from rest to a speed of 5 km/s. The net force accelerating the missile
500,000 N. How long does it take to arrive at the speed of 5 km/s?
Hint: For an example of this problem being worked out click here.
To view a transcript of this video, click here.
Click here for a PowerPoint version of the video.
To view a transcript of this PowerPoint click here.
7. Peter found an amazing fact in an amusement park when he tried to ride the Magic Mountain Superman. Powerful
magnets accelerate a car and its riders from zero to 45 m/s in 7 seconds. Suppose the mass of the car and riders
is 5,600 kg. What is the average net force exerted on the car and riders by the magnets?
Hint: For an example of this problem being worked out click here.
To view a transcript of this video, click here.
Click here for a PowerPoint version of the video.
To view a transcript of this PowerPoint click here.
8. Two forces of 10 N and 30 N are applied to a 10 kg box. Find (1) the box’s acceleration when both forces point
due east and (2) the box’s acceleration when 10 N force points due east and 30 N force points due west.
Hint: For an example of this problem being worked out click here.
To view a transcript of this video, click here.
Click here for a PowerPoint version of the video.
To view a transcript of this PowerPoint click here.
9. When a 60 g (=0.06 kg) tennis ball is served by a newly invented machine, it accelerates from zero to 50 m/s. The
ball experiences a constant acceleration due to the impact with the racket over a distance of 0.5 m. What is the
net force acting on the ball? Use the formula: a= (vf2-vi2)/2d regarding the relation among acceleration a, final
velocity vf, initial velocity vi and the traveled distance of an object d.
Unit II Problem Solving Worksheet
Hint: For an example of this problem being worked out click here.
To view a transcript of this video, click here.
Click here for a PowerPoint version of the video.
To view a transcript of this PowerPoint click here.
10. Cole is riding a sled with initial speed of 5 m/s from west to east. The frictional force of 50 N exists due west. The
mass of the sled and Cole together is 100 kg. How far does the sled go before stopping? Use the formula: a= (vf2vi2)/2d regarding the relation among acceleration a, final velocity vf, initial velocity vi and the traveled distance of
an object d.
Hint: For an example of this problem being worked out click here.
To view a transcript of this video, click here.
Click here for a PowerPoint version of the video.
To view a transcript of this PowerPoint click here.
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