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.
Which object has the greatest inertia?
a. a tennis ball
b. a bowling ball
c. a beach ball
d. a volleyball
What force causes a skater sliding on the ice to gradually slow down?
a. a balanced force
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.
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
d. the opposite
The gravitational force between two objects depends on masses of objects and
a. accelerations of objects.
b. distance between objects.
c. speeds of objects.
d. sizes of objects.
Which of the following objects exerts a gravitational force?
a. a bowling ball
b. a book
c. a feather
d. All of the above
Increasing which of these conditions results in more gravitational force between two objects.
d. surface area
When an objects is in free fall, the only force acting on it is
d. terminal velocity
Free-fall acceleration near Earth's surface
a. depends on an object's weight.
b. is the same for all objects.
c. depends on an object's mass.
d. None of the above.
Oribital motion is a combination of
a. mass and friction
b. forward motion and free fall
c. acceleration and gravity
d. weight and vertical velocity
Which statement about weight is incorrect?
a. An object weighs more on the moon than it weighs on Earth.
b. A change in an object's location can change the object's weight.
c. An object's weight is directly proportional to its mass.
d. The weight of an object depends on gravity.
Astronauts "float" when inside an orbiting spaceship because they are
b. in a vacuum
c. in free fall
d. outside Earth's gravity
Which is an example of projectile motion?
a. a rolling bowling ball
b. a dart thrown at a dart board
c. a balloon rising in the air
d. a high-speed train accelerating
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
The force exerted on the racket by a hit tennis ball is the
a. gravitational force
b. reaction force
d. action force
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.
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
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.
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
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
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