Match each of Newton’s laws to the appropriate concept: Second.

Match each of Newton’s laws to the appropriate concept: Third.

Select True or False. Complete mass-energy conversion is a good potential energy source because of the inherent instability of matter.

Select True or False. It is possible for an energy transformation to be 100% efficient under the right conditions.

Select True or False. The force doing work by electrical energy is a field force.

Select True or False. When a falling object reaches terminal velocity, its speed drops to zero since the drag caused by air resistance equals the object’s weight. Due to the balanced forces, it stops falling.

Select True or False. Air resistance is usually so small that it can be ignored.

Select True or False. An object’s mass on Jupiter will be different than its mass on Mars.

Select True or False. An 80 kg astronaut floating around in the International Space Station has almost no mass since he is in a “microgravity” environment.

Select True or False. An object’s weight on Jupiter will be different than its weight on Mars.

Select True or False. True free fall is not achievable in the earth's atmosphere.

Select True or False. When two objects are dropped from the same height at the same time, the heavier object will always hit the ground first.

Select True or False. In true free fall, a flat sheet of paper would still fall somewhat slower than a crumpled sheet.

Select True or False. The gravitational force between the sun and the earth is dependent on the square of the distance between their surfaces.

Select True or False. A microscopic organism like a protozoan can exert a gravitational force.

Select True or False. The law of universal gravitation states that gravitational force varies with the inverse of the mass of the object squared.

Select True or False. All objects exert gravitational attraction on each other; however even large objects do not exert enough gravitational pull to overcome forces, such as friction, and cause everyday objects to move toward each other.

Select True or False. Friction can positively accelerate an object.

Select True or False. An object falling through a fluid experiences no friction.

Select True or False. Static and kinetic friction are directly proportional to the force pressing the objects together.

Select True or False. Friction acts only on objects in motion.

Select True or False. A sled sliding down a hill experiences less friction than the same sled stopped at the bottom of the hill.

Select True or False. Newton’s third law applies to all objects regardless of their condition of motion.

Select True or False. The more mass an object possesses, the more inertia it possesses.

Select True or False. Even an object quite distant from the sun cannot be free from the sun’s gravitational pull.

Select True or False. Equal forces on the same object in the opposite direction are balanced.

Select True or False. When no outside forces act on a moving object, it will eventually stop moving.

Select True or False. Newton’s first law describes motion when no net forces are exerted.

Select True or False. According to Newton’s first law, only external forces acting on an object can cause it to accelerate.

Select True or False. Newton’s law of inertia applies only to moving objects.

Select True or False. Newton developed the equations describing why celestial bodies move the way that they do.

Select True or False. The forces acting on a system are balanced if and only if there is no acceleration.

Select True or False. Balanced forces cause an object, if it is in motion, to maintain its motion.

Select True or False. Field forces grow stronger with distance from the source, but contact forces do not change with distance.

Select True or False. Contact forces cause all observed changes in motion.

Select True or False. In addition to magnets, a moving electric charge can also be a source of a magnetic field.

Select True or False. Magnets are the sole source of magnetic fields.

Select True or False. The gravitational force, which acts across intergalactic distances, is the strongest of the fundamental forces.

Select True or False. Forces are vectors because they cause objects to accelerate in proportion to their magnitude.

Select True or False. The magnitude of a force is a scalar quantity.

Which object has the most inertia?

A sled sliding down a hill experiences ______ friction.

What do we call the tendency of an object in motion to continue in motion unless it is acted upon by an external force?

An object’s weight is directly proportional to its ______ (two possible answers).

A rotating bicycle tire experiences ______ friction.

A car parked on a hill experiences ______ friction.

When you sit down in a chair, the force acting on you is exerted by ______.

The forces acting on a system in mechanical equilibrium are all ______.

The tendency of matter to resist a change in motion until acted on by an external force is known as

An external force is exerted from ______ a system’s boundaries.

A force is a(n) ______ or a(n) ______ on a system.

The SI unit of force is the

A mountain climber falters on a steep slope and slides down until his safety harness catches, pulling his rope taut. Why does he stop sliding?

If all objects exert gravitational attraction on each other, why doesn't all matter clump together?

What condition must be met for true free fall to occur?

Air resistance increases with increasing

Why are hot air balloons floating at a constant altitude not in free fall?

Which of the following is the result of a field force?

Which of the following is the result of a contact force?

Who was the first person to write about the causes of motion?

Which of the following is the result of a contact force?

Which of the following fundamental forces is comparatively the weakest?

Which of the following is the result of a field force?

In which case are all the forces acting on a system balanced? (Systems are italicized)

Which object has the most inertia?

A wrecking ball strikes a brick wall. Which of the following would increase the force of the ball?

Which situation does not involve friction?

Which of the following are not directly proportional?

Galileo tested Aristotle's theory of gravity by actual experiments dealing with __________.

Why are hot air balloons floating at a constant altitude not in free fall?

Air resistance on a falling object increases with increasing __________ of the object.

Which branch of physics studies phenomena under extreme conditions, such as objects moving near the speed of light?

A piano suspended from a rope that goes through a pulley begins to fall. What is the largest force acting on the piano?

A mountain climber falters on a steep slope and slides down until his safety harness catches, pulling his rope taut. Why does he stop sliding?

How can you tell when the forces acting on a system are balanced

What two ever-present forces affect all motion on the earth?