Chapter 4 Quiz

A 1-kg mass at the Earth's surface weighs a. 1 N b. 4.9 N c. 9.8 N d. 10.8 N

c. 9.8 N

A 10-N falling object encounters 10 N of air resistance. The net force on the object is a. 0 N b. 4 N c. 6 N d. 10 N e. 20 N

a. 0 N

The mass of a pet turtle that weighs 10 N is a. about 1 kg b. about 10 kg c. about 100 kg d. about 1000 kg

a. about 1 kg

A light woman and a heavy man jump from an airplane at the same time and open their same-size parachutes at the same time. Which person will get to a state of zero acceleration first? a. the light woman b. the heavy man c. both should arrive at the same time

a. the light woman

A sack of potatoes weighing 200 N falls from an airplane. As the velocity of fall increases, air resistance also increases. When air resistance equals 200 N, the sack's acceleration in meters per second per second is a. zero b. 4.9 c. 9.8 d. infinite

a. zero

A push on a 1-kg brick accelerates it. Neglecting friction, to equally accelerate a 10-kg brick, one would have to push with a. just as much force b. 10 x more force c. 100 x more force d. 1/10 as much force

b. 10 x more force

An object is pulled northward by a force of 10 N and at the same time another force of 15 N pulls it southward. The magnitude of the resultant force on the object is a. 0 N b. 5 N c. 25 N d. 150 N

b. 5 N

A rock is thrown vertically into the air. At the top of its path, its acceleration in meters per second is a. zero b. 9.8 c. between 0 and 9.8 d. more than 9.8

b. 9.8

If an object's mass is decreasing while a constant force is applied to the object, the acceleration a. decreases b. increases c. remains the same

b. increases

Whenever the net force on an object is zero, its acceleration a. may be less than zero b. is zero c. may be more than zero

b. is zero

A rock weighs 30N on Earth. A second rock weighs 30N on the moon. Which of the two rocks has the greater mass? a. the one on earth b. the one on the moon c. they have the same mass

b. the one on the moon

Compared to the mass of a certain object on Earth, the mass of the same object on the moon is a. one sixth as much b. the same c. six times as much d. zero

b. the same

A tow truck exerts a force of 3000 N on a car, accelerating it at 2 meters per second. What is the mass of the car? a. 500 kg b. 1000 kg c. 1500 kg d. 3000 kg e. 6000 kg

c. 1500 kg

The force of friction on a sliding object is 10 Newtons. The applied force needed to maintain a constant velocity is a. more than 10 N b. less than 10 N c. about 10N

c. about 10 N

The human body can, under certain conditions, withstand an acceleration of 10 g (ten times the gravitational acceleration, or (10)(9.8)). What force would produce this acceleration of a 50-kg person? a. about 500 N b. about 2500 N c. about 5000 N d. about 25,00 N

c. about 5000 N

Compared to a 1-kg block of solid iron, a 2-kg block of solid iron has twice as much a. inertia b. mass c. volume d. all of the above e. none of the above

d. all of the above