Chapter 12 Science

Which of the following will result in the greatest acceleration? a. 56 N acting on a 1-kg box b. 56 N acting on a 2-kg box c. 23 N acting on a 2-kg box d. 23 N acting on a 5-kg box

a. 56 N acting on a 1-kg box

Which statement about weight is incorrect? a. An object weighs more on the moon than it weighs on Earth b. The weight of an object depends on gravity c. A change in an object's location can change the object's weight d. An object's weight is directly proportional to its mass

a. An object weighs more on the moon than it weighs on Earth

Near Earth's surface, the strongest gravitational force would occur between an elephant and a. Earth b. the sun c. the moon d. a cat

a. Earth

Earth pulls on the moon and holds the moon in its orbital. The moon pulls on Earth with an equal and opposite force. This is an example of a. Newton's third law b. Newton's first law c. Newton's second law d. None of the above

a. Newton's third law

The law that states that every object maintains constant velocity unless acted on by an unbalanced force is a. Newtons first law of motion b. Newtons third law of motion c. the law of conservation of momentum d. Newtons second law of motion

a. Newton's third law of motion

Which statement about action-reaction force pairs is incorrect? a. They act on the same object b. They always occur in pairs c. They occur at the same time d. They are equal and opposite

a. They act on the same object

In the absence of air resistance, how would the acceleration of a 1.5 kg book and the acceleration of a 15 kg rock differ if the objects were dropped from the same height? a. They would not differ, they would be the same b. The rock would accelerate twice as fast as the book c. The book would accelerate twice as fast as the rock d. The book would accelerate ten times as fast as the rock

a. They would not differ, they would be the same

Which of the following has a momentum of zero? a. a newspaper lying on a table b. a plane flying through the air c. a leaf falling to the ground d. All of the above

a. a newspaper lying on a table

The gravitational force between two objects depends on masses of objects and a. distance between objects b. acceleration of objects c. speeds of objects d. sizes of objects

a. distance between objects

Astronauts float when inside an orbiting spaceship because they are a. in free fall b. weightless c. outside Earth's gravity d. in a vacuum

a. in free fall

Free-fall acceleration near Earth's surface a. is the same for all objects b. depends on an object's mass c. depends on an object's weight d. None of the above

a. is the same for all objects

What is the reaction force when you place a cup on a table? a. the force of gravity on the cup b. the force of the table on the cup c. the force of the cup on the table d. the force of gravity on the table

a. the force of gravity on the cup

If two objects with different masses and traveling with different velocities collide, what law allows you to predict the motion of the objects after the collision? a. the law of conservation of momentum b. Newton's second law c. the law of universal gravitation d. Newton's third law

a. the law of conservation of momentum

If an equal force is applied to two cars of equal mass, Car A and Car B, Car A will have ____ acceleration as (than) Car B. a. the same b. greater c. less d. the opposite

a. the same

What is the momentum of a 255 g apple falling at 16.0 m/s?a. 4.08 m/s^2 downward b. 4.08 kg x m/s downward c. 15.9 m/s^2 downward d. 15.9 kg x m/s downward

b. 4.08 kg x m/s downward

Calculate the velocity of a 90.5 kg man running south with a momentum of 389 kg x m/s. a. 0.233 m/s south b. 4.30 m/s south c. 23.3 m/s south d. 35.2 m/s south

b. 4.30 m/s south

A force of 240.0 N causes an object to accelerate at 3.2 m/s^2. What is the mass of the object? a. 0.013 kg b. 75 kg c. 240 kg d. 768 kg

b. 75 kg

Which object has the greatest inertia? a. a tennis ball b. a bowling ball c. a beach ball d. a volleyball

b. a bowling ball

Which is an example of projectile motion? a. a high-speed train accelerating b. a dart thrown at a dart board c. a rolling bowling ball d. a balloon rising in the air

b. a dart thrown at a dart board

The force exerted on the racket by a hit tennis ball is the a. gravitational force b. reaction force c. acceleration d. action force

b. reaction force

When air resistance balances the weight of a falling object, the velocity a. rapidly increases b. remains constant c. slowly decreases d. None of the above

b. remains constant

If the net force on an object is zero, then the object has a. reaction forces b. action forces c. unbalanced forces d. balanced forces

balanced forces

One newton is the force that can give a mass of 1 kg an acceleration of a. 1 m/s. b. 9.8 m/s. c. 1 m/s^2. d. 9.8 m/s^2

c. 1 m/s^2

What unbalanced force is needed to give a 976 kg vehicle an acceleration of 2.50 m/s^2 a. 3.90 x 10^2 N b. 3.90 x 10^2 lb c. 2.44 x 10^3 N d. 2.44 x 10^3 lb

c. 2.44 x 10^3

A 10.0 kg dog chasing a rabbit north at 6.0 m/s has a momentum of a. 60.0 m/s b. 0.6 kg m/s c. 60.0 kg m/s north d. 60.0 kg/s

c. 60.0 kg m/s north

The law that states that for every action force there is an equal and opposite reaction force is a. Newton's second law of motion b. the law of conservation of momentum c. Newtons third law of motion d. Newtons first law of motion

c. Newton's third law of motion

In the absence of air resistance, how would the acceleration of a 1.5 kg book and the acceleration of a 15 kg rock differ if the objects were dropped from the same height? a. The book would accelerate ten times as fast as the rock b. The rock would accelerate twice as fast as the book c. They would not differ, they would be the same d. The book would accelerate twice as fast as the rock

c. They would not differ, they would be the same

Which object does not have momentum a. a fish swimming in a pond b. a feather falling to the ground c. a rock by the side of a road d. a boulder rolling down a hill

c. a rock by the side of the road

When objects are moved further apart from each other, the force of gravity between them a. increases b. stays the same c. decreases d. decreases at first then increases

c. decreases

Decreasing which of these conditions results in more gravitational force between two objects? a. surface area b. acceleration c. distance d. mass

c. distance

Whenever a force is exerted, another force occurs that is ____ in size, and ____ in direction. a. equal, same b. smaller, same c. equal, opposite d. smaller, opposite

c. equal, opposite

Orbital motion is a combination of a. mass and friction b. weight and vertical velocity c. forward motion and free fall d. acceleration and gravity

c. forward motion and free fall

What force causes a skater sliding on the ice to gradually slow down? a. a balanced force b. inertia c. friction d. acceleration

c. friction

The tendency of an object at rest to remain at rest is a. momentum b. free fall. c. inertia. d. acceleration

c. intertia

When a moving bowling ball hits a pin, some of the ball's momentum a. doubles in force b. increases the pin's mass c. is transferred to the pin d. is lost

c. is transferred to the pin

An object's momentum is determined by the object's a. weight and velocity b. mass and acceleration c. mass and velocity d. weight and acceleration

c. mass and velocity

A 0.25 kg steel ball experiences a net force of 1.15 N as it rolls down a ramp. What is the acceleration of the ball? a. 0.29 m/s^2 b. 0.90 m/s^2 c. 1.4 m/s^2 d. 4.6 m/s^2

d. 4.6 m/s^2

How much does a 59.0 kg woman weigh on Earth? a. 59.0 lb b. 145 lb c. 6.02 N d. 578 N

d. 578 N

What happens immediately after a sky diver opens her parachute? a. Air resistance greatly increases b. The forces of gravity greatly increases c. A stone will not move unless something pushes or pulls it d. All of the above

d. All of the above

Whenever an object is standing still, which value is always zero? a. velocity b. speed c. momentum d. All of the above

d. All of the above

Which of the following is true? a. weight is gravitational force an object experiences due to its mass b. the weight of an object on earth is greater than the weight of the same object on the moon, but the object's mass stays the same c. weight and mass are proportional but not equal d. All of the above

d. All of the above

Which of the following objects exerts a gravitational force? a. a book b. a bowling ball c. a feather d. All of the above

d. All of the above

Which statement illustrates Newton's first law? a. A ball rolling across the floor eventually slows down b. As a car comes to a stop, the passengers continue to move forward c. A stone will not move unless something pushes or pulls it. d. All of the above

d. All of the above

Which statement illustrates Newton's first law? a. A stone will not move unless something pushes or pulls it. b. A ball rolling across the floor eventually slows down. c. As a car comes to a stop, the passengers continue to move forward. d. All of the above

d. All of the above

Two identical cars are traveling at equal speeds. One is going north and the other south. If they collide head-on and stick together, what will happen to the motion of the cars? a. Both cars will move north b. Both cars will move east c. Both cars will move south d. Both cars will stop

d. Both cars will stop.

How does the total momentum of two objects before a collision compare with the total momentum after the collision? a. It is the same b. It is less c. It is equal to zero d. It is greater

d. It is greater

The law that states that the unbalanced force acting on an object equals the object's mass times its acceleration is a. Newton's third law of motion b. the law of conservation of momentum c. Newton's first law of motion d. Newton's second law of motion

d. Newton's second law of motion

Near Earth's surface, an object's free fall acceleration increases as its a. weight increases b. speed increases c. mass increases d. none of the above

d. None of the above

When the velocity of an object changes, it is acted upon by a(n) a. momentum b. deceleration c. inertia d. force

d. force

The weight of an object can be calculated by multiplying mass by a. distance b. speed c. velocity d. free fall acceleration

d. free fall acceleration

When an object is in free fall, the only force acting on it is a. friction b. inertia c. instantaneous velocity d. gravity

d. gravity

The SI unit of force, named after the scientist who described the relationship between motion and force, is called the a. Pasteur b. curie c. Einstein d. newton

d. newton

When gravitational forces and air resistance equalize on an object that is falling toward Earth and the object stops accelerating, what is the velocity of an object called? a. average velocity b. resultant velocity c. instantaneous velocity d. terminal velocity

d. terminal velocity

When gravitational forces and air resistance equalize on an object that is falling toward Earth and the object stops accelerating, what is the velocity of an object called? a. instantaneous velocity b. average velocity c. resultant velocity d. terminal velocity

d. terminal velocity

Weight is best described as a. a force solely dependent on an object's mass b. an object's resistance to acceleration c. what causes an object to fall d. the downward force exerted on an object due to gravity

d. the downward force exerted on an object due to gravity

A seat belt helps you when your car stops suddenly by providing a(n) a. balanced forward force. b. unbalanced forward force. c. balanced backward force. d. unbalanced backward force.

d. unbalanced backward force.

Which of the following equations is correct? a. w = g/m b. w = g + m c. w = m/g d. w = mg

d. w = mg