Force and Motion Dynamics
A block of mass is hung vertically from an ideal string. What is the tension in the string?
0
2mg
A block is suspended from the ceiling by a system of two ideal pulleys and a string. If the block has a weight of , what is the tension in the string connected to the ceiling?
2W
A person jumps off the ground. Identify the action-reaction pair in this scenario.
The person's weight and the normal force from the ground.
The force of the person pushing down on the Earth and the force of the Earth pushing up on the person.
The force of the person jumping upwards and the force of gravity pulling the person downwards.
The force of the person's muscles and the force of their bones.
Two blocks, A and B, are in contact on a horizontal frictionless surface. A force is applied to block A, which pushes block B. If and are the masses of blocks A and B respectively, what is the magnitude of the force that blo...
Which of the following best describes an internal force within a system?
A force exerted by an object outside the system on an object within the system.
A force that affects the motion of the system's center of mass.
A force exerted by one object within the system on another object within the same system.
A force that always causes the system to accelerate.
Which of the following is a characteristic of an ideal string?
It has a significant mass that affects the tension.
It stretches considerably when a force is applied.
The tension varies along its length.
It has negligible mass and doesn't stretch.
A non-ideal string with mass and length is hanging vertically. If the tension at the top of the string is , what is the tension at a point from the top of the string?

How are we doing?
Give us your feedback and let us know how we can improve
A system consists of two ice skaters pushing off from each other. Skater A has a mass of 50 kg, and Skater B has a mass of 75 kg. They push off each other, and Skater A accelerates at 2 m/s^2
. What is the magnitude of the acceleration of ...
1.0 m/s^2
1.33 m/s^2
2.0 m/s^2
3.0 m/s^2
What is the primary function of an ideal pulley?
To increase the magnitude of the applied force.
To decrease the magnitude of the applied force.
To change the direction of the tension force.
To store potential energy.
A book rests on a table. Which of the following statements accurately describes the reaction force, as defined by Newton's Third Law, to the weight of the book?
The force of the table pushing up on the book.
The force of the book pushing down on the table.
The force of the Earth pulling on the book.
The force of the book pulling up on the Earth.