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A standard for comparison that helps to ensure that the experimental result is caused by the condition being tested is the
A factor that changes in an experiment from manipulation of the independent variable is the
An idea, event, or object that can be used to represent something you are trying to explain is a
In an experiment to determine if the popping or popcorn is affected by the temperature at which it is stored, counting the popped kernels is an example or a(n)
The type of graph that would be used to show how some fixed quantity is broken down into parts is a
In a graph showing how the temperature of a material changes over time, temperature change is the
If you ride your bike down a straight road for 500m then turn around and ride back, your distance is __ your displacement.
If you ride your bike up a hill, then ride down the other side, your acceleration is
first negative, then positive
Examine figure 11-1. If you were standing under the tree, which object would appear to be moving?
a passenger in the rear seat of a car moving at a steady speed is at rest relative to
the front seat of the car
What is the most appropriate SI unit to express the speed of a cyclist in the last leg of a 10-km race?
Speed is the ratio of the distance an object moves to
the amount of time needed to travel the distance
Which example describes constant acceleration due ONLY to a change in direction?
traveling around a circular track
An object that is accelerating may be
all of the above (slowing down, gaining speed, changing direction)
Which of the following statements is true?
An object at rest has an instantaneous acceleration of zero.
In the absence of air, a penny and a feather that are dropped from the same height at the same time will
fall at the same reate
When an object moves in a circular path, it accelerates toward the center of the circle as a result of
For any object, the greater the force that's applied to it, the greater its ___ will be.
The size of the gravitational force between two objects depends on their
masses and the distance between them
When a force is exerted on a box, an equal and opposite force is exerted by the box. These forces are called __ forces.
A real care moving at 10 km/h has more momentum than a toy car moving at the same speed because the real car
has greater mass
The statement "to every action there is an equal and opposite reaction" is
Newton's third law of motion
When two balls collide, the momentum of the balls after the collision is explained by
the law of conservation of momentum
As you push a cereal box across a tabletop, the sliding friction acting on the cereal box
acts in the direction opposite of motion
According to Newton's second law of motion, the acceleration of an object equals the net force actin on the object divided by the object's
The acceleration due to gravity on the surface of Mars is about one third the acceleration due to gravity on Earth's surface. The weight of a space probe on the surface of Mars is about
one third its weight on Earth's surface.
The law of __ states that energy in a system can change forms but can never be created or destroyed.
conservation of energy
According to the law of conservation of energy, the total amount of energy in the universe
An object's gravitational potential energy is not directly related to which of the following?
Why is the gravitational potential energy of an object 1 meter above the moon's surface less than its potenial energy 1 meter above Earth's surface?
the object's acceleration due to gravity is less on the moon
The gravitational potential energy of an object is always measured relative to the
reference level from which the height is measured.
The total potential an d kinetic energy of all the microscopic particles in an object make up its
Which of the following statements is true according to the law of conservation of energy.?
all of the above
If no friction acts on a diver during a dive, then which of the following statements is true?
KE + PE = KE + PE
In which of the following does Einstein's famous equation apply?
nuclear fission and fusion reactions
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