Which has the greater mass? |
B) an automobile battery |

A kilogram is a measure of an object’s |
mass |

Compared to a 1-kg block of solid iron, a 2-kg block of solid iron has twice as much |
D) all of these |

Compared to a 1-kg block of solid iron, a 2-kg block of solid iron has the same |
E) none of these |

An object maintains its state of motion because it has |
mass |

Your weight is |
the gravitational attraction between you and the Earth. |

One object has twice as much mass as another object. The first object also has twice as much |
inertia. |

Compared to the mass of a certain object on Earth, the mass of the same object on the moon is |
the same |

Strange as it may seem, it is just as hard to accelerate a car on the moon as it is to accelerate the same car on Earth. This is because |
the mass of the car is independent of gravity. |

An empty roller-coaster car at an amusement park takes 3 minutes to make its ride from start to finish. |
3 minutes |

The newton is a unit of |
force |

In which case would you have the largest mass of gold? If your chunk of gold weighed 1 N on the |
moon |

An object weighs 30 N on Earth. A second object weighs 30 N on the moon. Which has the greater mass? |
the one on the moon |

An object’s weight may properly be expressed in |
newtons |

A force is a vector quantity because it has both |
magnitude and direction. |

A 10-kg brick and a 1-kg book are dropped in a vacuum. The force of gravity on the 10-kg brick is |
10 times as much as the force on the 1-kg book |

An object is propelled along a straight-line path by a force. |
double |

If an object’s mass is decreasing while a constant force is applied to the object, the acceleration |
increases |

An object is propelled along a straight-line path in space by a force. |
halves. |

An object is pulled northward with a force of 10 N and southward with a force of 15 N. |
5 N |

The force of friction on a sliding object is 10 newtons. |
10 N. |

A 10-N falling object encounters 4 N of air resistance. The net force on the object is |
6 N |

A 10-N falling object encounters 10 N of air resistance. The net force on the object is |
0 N |

An apple weighs 1 N. When held at rest above your head, the net force on the apple is |
0 N |

An apple weighs 1 N. The net force on the apple when it is in free fall is |
1 N. |

Which has zero acceleration? An object |
D) all of these. |

Whenever the net force on an object is zero, its acceleration |
is zero. |

The maximum acceleration of a car while towing a second car twice its mass, compared to no towing, is |
one third. |

Suppose you’re coasting on level ground in a car at 60 km/h and apply the brakes until you |
continue moving at 40 km/h in the absence of forces |

A heavy block at rest is suspended by a vertical rope. |
increases. |

A 1-kg mass at the earth’s surface weighs |
9.8 N |

If a non-rotating object has no acceleration, then we can say for certain that it is |
in mechanical equilibrium |

When you stand at rest on a pair of bathroom scales, the readings on the scales will always |
add to equal your weight |

Hang from a pair of gym rings and the upward support forces of the rings will always |
add up to equal your weight. |

A car has a mass of 1000 kg and accelerates at 2 meters per second per second. |
2000 N |

A tow truck exerts a force of 3000 N on a car, accelerating it at 2 meters per second per second. |
1500 kg |

A girl pulls on a 10-kg wagon with a constant horizontal force of 30 N. |
3.0 |

If the mass of an object does not change, a constant net force on the object produces constant |
acceleration |

A force of 1 N accelerates a mass of 1 kg at the rate of 1 m/s2. |
the same |

A bag of groceries has a mass of 10 kilograms and a weight of about |
100 N |

The mass of a pet turtle that weighs 10 N is about |
1 kg |

The force required to maintain an object at a constant velocity in free space is equal to |
zero |

An object following a straight-line path at constant speed |
has zero acceleration |

A man weighing 800 N stands at rest on two bathroom scales so that his weight is distributed |
400 N |

Neglecting friction, a large block of ice and a small block of ice start sliding down an incline together. |
at the same time as the light block |

When a woman stands at rest with two feet on a scale, the scale reads 500 N. When she gently lifts one foot, |
500 N |

A push on a 1-kg brick accelerates the brick. Neglecting friction, to equally accelerate a 10-kg brick, |
10 times as much force |

A 10-N block and a 1-N block lie on a horizontal frictionless table. To push them with equal acceleration, |
10 times as much force on the heavier block |

A rocket becomes progressively easier to accelerate as it travels upward from the ground mainly because |
the mass of the rocket decreases as fuel is burned |

A rock is thrown vertically into the air. At the very top of its trajectory the net force on it is |
its weight |

A rock is thrown vertically into the air. At the top of its path, its acceleration in meters per second per second is |
9.8 |

A block is dragged without acceleration in a straight-line path across a level surface by a force of 6 N. |
6 N |

Suppose a particle is being accelerated through space by a 10-N force. Suddenly the particle encounters a second force of 10 N in the opposite direction from the first force. |
continues at the speed it had when it encountered the second force |

A jumbo jet has a mass of 100,000 kg. The thrust for each of its four engines is 50,000 N. |
2 |

A 1-kg rock that weighs 9.8 N is thrown straight upward at 20 m/s. Neglecting air resistance, |
9.8 N |

A 1-kg ball is thrown at 10 m/s straight upward. Neglecting air resistance, the net force that acts |
10 N |

The brakes of a speeding truck are slammed on and it skids to a stop. |
the same |

A skydiver of mass 100 kg experiences air resistance of 500 N, and an acceleration of about |
0.5 g |

An object released from rest on another planet requires one second to fall a distance of 6 meters. |
12 |

A car traveling at 22 m/s comes to an abrupt halt in 0.1 second when it hits a tree. |
220 |

A 10-kilogram block with an initial velocity of 10 m/s slides 10 meters across a horizontal surface |
50 N |

A 10-kilogram block is pushed across a horizontal surface with a horizontal force of 20 N against |
1 |

If you are driving at 20 m/s and slam on your brakes and skid at 0.5 g to a full stop, |
4 |

A 1000-kg automobile enters a freeway on-ramp at 20 m/s and accelerates uniformly up to 40 m/s in a time of 10 seconds. How far does the automobile travel during that time? |
300 m |

A 2000-kg car experiences a braking force of 10,000 N and skids to a stop in 6 seconds. |
30 m/s |

An astronaut on another planet drops a 1-kg rock from rest and finds that it falls a vertical |
5 N. |

What horizontally-applied force will accelerate a 400-kg crate at 1 m/s2 across a factory floor |
2400 N |

The human body can, under certain conditions, withstand an acceleration of 10 g. What net |
About 5000 N |

If an object of constant mass experiences a constant net force, it will have a constant |
acceleration |

If more horizontal force is applied to a sliding object than is needed to maintain a constant velocity, |
the object accelerates in the direction of the applied force. |

If less horizontal force is applied to a sliding object than is needed to maintain a constant velocity, |
the object eventually slides to a stop |

Two factors that greatly affect air resistance on falling objects are the |
size and speed of the object |

When a falling object has reached its terminal velocity, its acceleration is |
zero |

Two objects of the same size, but unequal weights are dropped from a tall tower. |
heavier object |

A light woman and a heavy man jump from an airplane at the same time and open their |
the light woman |

A large and a small person wish to parachute at equal terminal velocities. |
get a larger parachute. |

A skydiver, who weighs 500 N, reaches terminal velocity of 90 km/h. |
500 N |

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 |
0 |

An elephant and a feather fall from a tree through the air to the ground below. |
elephant |

When an object falls through the air, its velocity increases and its acceleration |
decreases |

A skydiver jumps from a high-flying plane. As her velocity of fall increases, her acceleration |
decreases |

A skydiver steps from a helicopter and falls for 5 seconds before reaching her terminal velocity. |
decreases |

A 500-N parachutist opens his chute and experiences an air resistance force of 800 N. |
300 N upward |

A ball is thrown vertically into the air. Because of air resistance, its speed when it returns to its starting level compared to its initial speed is |
less |

A pair of tennis balls fall through the air from a tall building. One ball is regular and the other is filled with lead pellets. The ball to reach the ground first is the |
lead-filled ball |

A pair of tennis balls fall through the air from a tall building. One ball is regular and the other is filled with lead pellets. Air resistance just before they hit is actually greater for the |
lead-filled ball |

A ball is thrown vertically into the air. Because of air resistance, its time coming down compared to its time going up is |
more |

88) A ball thrown straight upward takes 10 seconds to go up and return to the ground. Because of air resistance, the time taken for the ball just to go up is |
less than 5 s. |

A falling skydiver of mass 100 kg experiences 500 N air resistance. The acceleration of the skydiver is |
0.5 g |

An astronaut on another planet drops a 1-kg rock from rest. The astronaut notices that the rock falls 2 meters straight down in one second. On this planet, how much does the rock weigh? |
4 N |

A feather and a coin will have equal accelerations when falling in a vacuum because |
the ratio of each object’s weight to its mass is the same |

A skydiver’s terminal velocity will be greatest if she falls |
head first |

# Physics Practice Questions Chapter 4

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