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WorksheetsUnit 3 Dynamics
Total questions: 15
Worksheet time: 8mins
A student is sitting at rest in a chair. How does the force that the student exerts on the chair compare to the force the chair exerts on the student?
The same magnitude and the same direction
The same magnitude but the opposite direction
A larger magnitude but the opposite direction
A smaller magnitude but the same direction
Two students pull horizontally at opposite directions on two spring scales. Each student pulls with a force of 10 N. What is the reading on the spring scale?
0 N
5 N
10 N
20 N
A cart with a mass of 5 kg rests on a floor next to a wall. A person pushes the cart to the left toward the wall with a force of 100-N, as shown in the diagram. When is the force the of the cart on the wall equal to the force of the wall on the cart?
The cart and the wall must be at rest
The cart and wall must be moving with constant velocity.
The cart and the wall must be either at rest or moving with constant velocity.
The two forces are equal under all conditions.
Which of the following best explains how a person can jump into the air?
The person pushes herself up off of the ground with a force equal to her weight.
The person pushes down on the floor with a force equal to her weight, causing the floor to push upward on the person with a force equal to her weight.
The person pushes herself up off of the ground with a force greater than her weight.
The person pushes down on the floor with a force greater than her weight, causing the floor to push upward on the person with a force greater than her weight.
A group of students are told to measure the acceleration of the Atwood machine pictured above. One student suggests that they use a 4 kg and 2 kg mass instead. How will the acceleration of the system with 4 kg and 2 kg masses compare to the original system?
The acceleration of the new system will be larger because the total mass of the system is larger
The acceleration of the new system will be larger because the 4 kg mass has more weight
The acceleration of the new system will be smaller because the total mass of the system is larger
The acceleration of the new system will be smaller because the 2 kg mass has more weight
In the modified Atwood machine above block m1 sits on a frictionless table and the system has an acceleration of A. Assuming m2 is twice the mass of m1, if the two blocks were switched places, how would the new acceleration compare to A?
No change to A, because the total mass remains the same
No change to A, because the mass difference remains the same
Decrease to ½A, because the net force accelerating the system has decreased by ½
Increase to 2A, because the net force accelerating the system has increased by 2
You take a trip to a mystery planet that is twice the size of the Earth. How does the gravitational force acting on you change on the new planet compared to what the gravitational force acting on you is on Earth?
The gravitational force on the you when on the new planet is quadruple the gravitational force on you when on Earth.
The gravitational force on the you when on the new planet is half of the gravitational force on you when on Earth.
The gravitational force on the you when on the new planet is double the gravitational force on you when on Earth.
The gravitational force on the you when on the new planet is the same as the gravitational force on you when on Earth.
Three equal magnitude forces act on the box shown. The is one upward force, one downward force, and one rightward force. Which of the following statements must be true based on this information?
1. The box has no vertical component of velocity.
2. The acceleration of the box is directed to the right.
3. The velocity of the box is changing with time.
1 and 2 only
1 and 3 only
2 and 3 only
1 and 3 only
The box in the diagram above is moving to the right. The applied force is 50N (x-component = 40 N, y-component = 30 N). If the box is slowing down then the friction force must be ...
Equal to 40 N
Greater than 40 N
Equal to 50 N
Greater than 50 N
The box in the diagram above is moving to the right. If the angle of the applied force is increases, how are friction and normal force affected?
Normal force decreases, friction decreases
Normal force decreases, friction increases
Normal force increases, friction increases
Normal force increases, friction increases
A person is in an elevator riding up and down various floors. The person will feel heavier than normal when -
the elevator is moving upward and gaining speed.
the elevator is moving upward but losing speed.
the elevator is moving upward at constant speed.
the elevator is moving down with increasing speed.
A block is being pulled across a table with a rope. The following graph shows the block's velocity as a function of time. At what time interval are the forces acting on the block balanced?
From t = 0-4 seconds
From t = 4-6 seconds
At t = 4 seconds
At no point in the 6 seconds of the graph
A block is being pulled across a table with a rope. The following graph shows the block's velocity as a function of time. At what time interval is the block experiencing the greatest net force?
From t = 0-4 seconds
From t = 4-6 seconds
At t = 4 seconds
At no point in the 6 seconds of the graph
A box is being pushed across a flat, rough surface while slowing down. Which of the following free body diagrams best represents this scenario?
The graph of velocity vs. time for an object moving along a straight line is given. During the time shown on the graph, the speed and net force on the object will have which of the following characteristics?
The speed is constant but not zero, while the net force is zero.
The speed is constant but not zero, while the net force is constant but not zero.
The speed is increasing, while the net force is zero.
.The speed is increasing, while the net force is constant but not zero.
