Chapter 6 Newton's Second Law of Motion PHYSICS

Terms in this set (24)

When a hockey puck is struck with a hockey stick, an _______________ acts on the puck and the puck _____________.
unbalanced force and acceleration
What type of force causes acceleration
unbalanced forces
The combination of force acting on an object is known as the ___________ force
net
The acceleration of an object is directly proportional to the net force acting on it. This means that, as the net force acting on the object increase, the acceleration of the object _____________.
increase
T or F
A net force acting on an object causes acceleration
True, net force is the main
Two shopping carts of equal mass are pushed by two different people. One cart accelerates three times as fast as the other cart. Describe the forces acting on each cart
A net force acts on both carts. The net force acting on the cart that acceleration faster is 3 times greater than the other force.
For a constant force, how does an increase in an object's mass affect its acceleration
an increase in the mass will result in an decrease in the acceleration
What does it mean for two quantities to be inversely proportional to one another
When one quantity increases the other quantity decreses
How are mass and acceleration related
acceleration ~ 1/mass
What are the quantities related by Newton's second law
mass, force, and acceleration
What are all the statements related to Newton's second law?
- acceleration is directly proportional to the net force
- The direction of acceleration is the same as the net force
- Acceleration is inversely proportional to mass
When using the equation for Newton's second law, if force is measured in newtons, then the unit for acceleration is ____________ and the unit for mass is ___________.
m/^s (meters per second squared) and kg
T or F
The acceleration of an object is equal to the net force acting on it divided by the object's mass
True, they are proportinal
A 100-N force is used to accelerate a large push cart across the floor. What is the force e force required to accelerate the push cart twice as fast.
200 N
An object accelerates when a net force is applied to it. What describes the conditions that would double the object's acceleration.
halving the mass
During a lab experiment, a net force is applied to an object and the object accelerates. The mass of the object is then doubled, and the net force applied to it also doubles. Describe the object's acceleration.
The object accelerates at the same rate
What equation describes Newton's second law of motion
a = F/m
Describe what causes friction between two solid surfaces.
The friction is due to irregularities in the two surfaces being pressed together. Force is
needed to move one material up and over the other or to scrape the irregularities away.
T or F
Friction does not depend on the
types of materials in contact with each other.
False
What does friction depend on?
it depends on how much the materials in contact are pushed together.
The figure above shows where an out-of-control car might strike a concrete road divider. In terms of friction, explain why the concrete barrier is superior to the steel barrier in the figure.
The concrete divider provides greater friction than a steel divider, this slowing the car more
Substances that are liquids or gases are also called ___________
fluid
When friction is present, an object can move with constant _____________ even when an outside force is applied.
velocity
A ____________ is a diagram in which all of the forces acting on an object are shown.
free body diagram
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