Phys. Science Coach White Ch. 12 Forces and Motion M/C QUESTIONS
What are Forces acting on a projectile?
AIR RESISTANCE AND GRAVITY
Objects within a closed system can exert forces on one another, but other objects and forces ____ leave or ____ the system.
Cannot Enter
What is the difference b/n mass and weight? LESS
Consider the same astronaut shown on earth and on the moon. On the moon, the acceleration due to gravity is only about 1/6 that on Earth. Thus, the astronaut weighs only about 1/6 as much on the moon as on Earth. In both locations, the mass of the astronaut is the same, but an object will weigh ____ on the moon than it weighs on Earth.
In a closed system with two objects, the loss of momentum of one object equals the ____ in momentum of the other object.
GAIN
What is an object's tendency to RESIST a change in motion?
Inertia
What affects the momentum of a moving object?
Mass and Velocity
What is the definition of a balanced force?
NET FORCE of a system is EQUAL to 0
What is the definition of a UNbalanced force?
NET FORCE of a system is GREATER than 0
When balanced forces at on an object, there is ____ in the object's motion because the net force is ___
NO CHANGE ZERO
When unbalanced forces act on an object, the net force is ____, so the object ________
NOT ZERO ACCELERATES
In a closed system with two objects, the loss of momentum of one object equals the gain in momentum in the ____ object.
Other
According to the Law of Conversation Momentum, what happens to the total momentum of a system?
The total momentum DOES NOT CHANGE
Net Force
What is the OVERALL FORCE acting on an object AFTER all the forces are COMBINED is the _____?
Balanced vs. Unbalanced Forces
When balanced forces act on an object, there is NO CHANGE in the object's motion because the net force is ZERO.....When unbalanced forces act on an object, the net force is NOT ZERO, so the object ACCELERATES.
What does projectile motion look like?
When you throw a ball forward, you'll notice that it actually follows a curved path. This curved path is an example of falling object (projectile) after its given an initial forward velocity.
Your in-line skates are sitting in a box on a shelf in the closet. What is their momentum?
ZERO
What is weight?
a measure of the FORCE OF GRAVITY acting on an object.
What is mass?
a measure of the INERTIA of an object.
Force
a push or pull that acts on an object.
For every action force there is a a. reaction force b. net force c. friction force d. unbalanced force
a.
Which is not a force? a. friction b. gravity c. momentum d. weight
c.
What force besides gravity acts on a projectile? a. weak nuclear b. electrical c. magnetic d. air resistance
d.
If two identical objects are moving at different velocities, the object that is moving faster will have ______ momentum.
greater
What does the Law of Conservation of Momentum state?
if no net force acts on a system, then the total momentum of the system DOES NOT CHANGE
What happens to an object when an unbalanced force acts on it?
it accelerates
An object with a small mass can have a_______momentum if the object is traveling at a high speed.
large
What is the curved path caused by the combination of an initial forward velocity and the downward force of gravity?
projectile motion
What are two factors that affect air resistance?
speed and surface area
When shooting an arrow at a target, why is it advisable to aim above the bull's eye rather than directly at it?
the arrow follows a projectile path
What happens to the momentums of 2 objects when they come into contact with one another?
the momentums are TRANSFERRED to the other object
