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Definitions
Definitions
Definitions
NJASK Practice
NJASK Practice
100
What is the definition of acceleration?
change in an object's speed or direction.
100
What is the definition of inertia?
the tendency of objects to keep doing what the are doing.
100
What is the definition of Newton's Third Law of Motion?
for every action there is an equal and opposite reaction.
100
What is an example of a contact force?
friction
100
Zack throws a ball straight up intothe air. The height of the ball at different times is shown below: Time(s) Height(m) 0 0 1 15 2 20 3 15 4 0 What is the average speed of the ball from 3 seconds to 4 seconds?
15 m/s
200
What is the definition of contact force?
a force that must touch an object to change its speed and or direction.
200
What is the definition of net force?
the amount by which the opposing forces acting on an object are unequal
200
What is the definition of non contact force?
a force that acts on an object to change its speed or direction from a distance
200
In which situation are the forces acting on the object balanced?
a hot air balloon rises at a constant speed.
200
In outer space, a small ball of rock and ice travels for thousands of years. Its motion does not change in any way during that time. As it approaches the solar system, however, it comes under the influence of the Sun's gravity, and its motion begins to change. What principle does this demonstrate?
An object in motion moves in a straight line at constant speed until acted on by a net force.
300
What is the definition of force?
a push or pull that causes anything to change its motion.
300
What is the definition of newton?
the metric unit used to measure force or weight
300
What is the definition of normal force?
the force that pushes up to support the weight of an object
300
The net force acting on an object is 0 degrees North. What best describes the motion of the object?
the object's motion is not changing
400
What is the definition of friction?
a force that occurs when two move past each other and rub together.
400
What is the definition of Newton's First Law of Motion?
if the forces is acting on an object are balanced the object will continue doing what its doing
400
Sean pushes a parked car with a force of 80 newtons. The car does not move. What best describes the force that the car exerts on Sean?
the same amount of force as Sean exerts
500
What is the definition of gravity?
the force that acts without physical contact to pull two objects close to each other
500
What is the definition of Newton's Second Law of Motion?
the acceleration of an object is related to the net force acting on it and the mass of the object
500
Which force has the greatest influence on the structure of solar systems and galaxies?
gravity