chapter 2 9/05/17

Two people each pull with 300 N on a rope in a tug of war. What is the net force on the rope?

0 N

Two people each pull with 300 N on a rope in a tug of war. How much force is exerted on each person by the rope?

300 N

A different scaffold that weighs 400 N supports two painters, one 500 N, and the other 400 N. The reading in the left scale is 800 N. https://session.masteringphysics.com/problemAsset/1789678/1/Hewitt11e.ch02.p4.jpg What is the reading in the right-hand scale? Express your answer to two significant figures and include the appropriate units.

500N

Lucy Lightfoot stands with one foot on one bathroom scale and her other foot on a second bathroom scale. Each scale reads 380 N. What is Lucy's weight?

760N

What is inertia? a) Inertia is the tendency of a body to maintain its state of motion in the absence of applied forces. b) Inertia explains why things stay in motion but not why they stay at rest. c) Inertia explains why things stay at rest but not why they stay in motion. d) Inertia describes why it is easier to get a massive ball moving than it is to get a less massive one moving.

a) Inertia is the tendency of a body to maintain its state of motion in the absence of applied forces.

What is the resultant of a pair of one pound forces at right angles to each other? a) The resultant is a force of 1.41 pounds in a direction bisecting the 90-degree angle between the two vectors. b) The resultant is a force of 1.0 pound in a direction bisecting the angle between the two vectors. c) The resultant is a force of 2.0 pounds in a direction bisecting the angle between the two vectors. d) The resultant is zero force.

a) The resultant is a force of 1.41 pounds in a direction bisecting the 90-degree angle between the two vectors.

If no external forces act on a moving object, it will a) continue moving at the same speed. b) come to an abrupt halt. c) move slower and slower until it finally stops. d) none of the above

a) continue moving at the same speed.

What is the net force on an object in either static or dynamic equilibrium? a) The net force is vertical for static equilibrium and horizontal for dynamic equilibrium. b) The net force is zero for static equilibrium and greater than zero for dynamic equilibrium. c) The net force is zero. d) The net force is equal and opposite to the weight of the object.

c) The net force is zero.

An object in mechanical equilibrium is an object: a) moving with constant velocity. b) having no changes in velocity. c) at rest. d) all of the above

d) all of the above

The earliest and most influential Greek philosopher was Aristotle, who among many contributions taught that a) all motion is either natural or violent. b) the four elements are earth, water, air, and fire. c) violent motion requires a sustained push or pull. d) all of the above

d) all of the above.