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8th Grade Exam 5
Test Description: Review for first semester exam part 5
Instructions: Answer all questions to get your test result.
1) What states the law of conservations of energy?
A
Energy is needed to break chemical bonds.
B
light energy is released by some exothermic reactions
C
an exothermic reaction releases energy
D
in a chemical reaction , energey is neither created nor destryoed, but can change in form
2) Which of the following usually increases the rate of a reaction?
A
lowerin the temperature of the reactents.
B
decreasing the concentration of the reactants.
C
Grinding a solid reactant into a powder.
D
raising the temperature of the products
3) The forcees on an object are balanced if the net force on an object
A
increases
B
is at zero
C
decreases.
D
is not equal to zero
4) A measure of the gavitational force exerted on an object is the
A
weight
B
net force
C
kilogram
D
mass
5) The rate at wich velocity changes over time is
A
acceleration
B
gravitational velocity
C
projectile motion
D
final velocity
6) Everything on earth is pulled downward toward the center by
A
gravity
B
acceleration
C
net force
D
velocity
7) You must describe the position, speed, and direction of motion of an object in order to fully describe its...
A
motion
B
force
C
momentum
D
ACCELLERATION.
8) The reason mass and weight are the same everywhere on earth is because
A
mass is the same as weight throughtout the universe.
B
the gravitional force is the same.
C
mass and weight are the same thing
D
mass and weight are measured the same way
9) Wich is a common unbalaced force acting on objects in motion?
A
friction
B
inertia
C
acceleration
D
speed
10) when a car increases its velocity, its momentum
A
increases
B
is transfurder to its surroundings.
C
remains unchanged
D
decreases
*select an answer for all questions
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