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It is the beginning of the school day on a cool October morning. Students in your fifth-grade class arrive at the classroom, and, without being reminded, they unpack, put their book bags away, turn in their homework folders, sharpen their pencils, sit down, and begin doing the morning work that you have written on the board. Which of the following statements is most accurate in this instance?  

Lucas, a third-grader, enters his classroom for the first time and see that the desks are in rows. If you were Lucas, what conclusion might you draw about the nature of instruction in this class?  

A car moving east collides with a truck moving north. The vehicles have the same speed but the truck has twice the mass of the car. If the vehicles stick together after the collision, what is the path followed by the vehicles after the collision?

In attempting to pull a 1500-kg car out of a ditch, Arnold exerts a force of 300 N for three seconds, Bob exerts a force of 500 N for two seconds, and Cecil exerts a force of 200 N for four seconds. Who provided the greatest impulse?

A bullet is fired into a wall and comes to rest. Considering only the bullet as the system we can say that

If an object has a larger potential energy than kinetic energy,

On a frictionless tabletop, a force is applied to an object: the object’s velocity is horizontal and the force is perpendicular to the tabletop. Which of the following is true?

A box is pushed across a rough horizontal floor by a force acting parallel to the floor in the direction of motion. A force doing no work during the motion is

A physics professor places a soda pop can on the table and asks a student to identify the forces acting upon the can and the directions of each force. The two forces acting on the soda pop can are

A box is pushed eastward across a rough horizontal floor by a force acting parallel to the floor. A force providing an impulse directed westward on the body is