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WorksheetsUnit Test 2 Review
Total questions: 45
Worksheet time: 34mins
The pull of gravity on Earth is caused by the (a) of the Earth.
Michael and Ava are on a space adventure! They notice their weights are different on various planets.
Which force is responsible for this cosmic weight change?
gravitational
electrical
friction
magnetic
A teacher is conducting an investigation by using special equipment to hold a magnesium (Mg) ribbon over the flame of a Bunsen burner.
Which observation indicates a chemical reaction took place?
The temperature of the magnesium ribbon increased.
B.
The shape of the magnesium ribbon changed.
The burning magnesium produced light.
The magnesium appeared to evaporate.
City Goats Love Their Pizza!!!
What does the "C" in "City" stand for?
(a)
Some power plants produce energy by burning coal. In these power plants, the heat from burning coal is used to boil water.
Which statement best describes the changes that occur when burning coal and boiling water?
Burning coal and boiling water are both physical changes.
Burning coal and boiling water are both chemical changes.
Burning coal is a chemical change, and boiling water is a physical change.
Burning coal is a physical change, and boiling water is a chemical change.
Is the Net Force balanced or Unbalanced?
Balanced
Unbalanced
Lucy and Carlos were conducting a lab to identify possible evidence of chemical changes of matter. They begin by combining two substances in a zip bag. They observed the zip bag filling up with gas and the temperature of the combined substances begins to drop. Identify the evidence that supports a possible chemical change had taken place.
Select TWO answers.
The zip bag filled up with gas.
A student closed the zip bag.
Both substances combined.
The temperature of the combined substances dropped.
They added substances to the zip bag
Two liquids are combined in a beaker.
Which of the following does NOT indicate a chemical reaction occurred?
A gas being produced
A solid being formed
Liquid evaporating
A change in temperature
A box slides down an inclined plane. Gravity is one force acting on the box. What is the other?
(a)
Mrs. King and Mr. King decided to move a dresser across the room. They both stood on the same side and pushed left with a total of 30N of force, although there was 10N of friction. What is the net force and direction?
40N Left
30N Left
20N Left
10N Left
If there are two forces going in the same direction how would you find the net force?
Divide
Anika and Kai are on a space adventure! What are two things they can do to increase the gravitational pull between their spaceship and a mysterious planet?
Increasing the mass of their spaceship
Decreasing the mass of their spaceship
Increasing the distance between the spaceship and the planet
Decreasing the distance between the spaceship and the planet
A force that only pulls, never pushes. All object with mass have this force.
(a)
Doug ranked the following objects in order from most mass to least mass: Sun, Jupiter, Earth, Moon.
Based on this information, which object has the most gravity?
Jupiter
Moon
Earth
Sun
What force always acts in the opposite direction of movement?
gravity
magnetism
friction
normal
Imagine if the moon and Earth decided to take a break from gravity! What do you think would happen to the moon?
The moon would quickly crash into the Earth.
It would continue at a constant speed in a straight line through space.
The moon would still orbit Earth as it does now.
The moon would have no inertia and would remain stationary at a fixed distance from Earth.
One person pulls on a rope with a force of 400 N to the right. Another person pulls on the opposite end with a force of 600 N to the left.
What is the unbalanced net force?
200 N to the left
400 N to the left
600 N to the left
1000 N to the left
During a science class experiment, a teacher places a small amount of sugar in a spoon and heats it over a candle. The sugar turns black.
What is the best evidence that a chemical change has taken place?
A change in color
A change in shape
A change that cannot be reversed
A change in state of matter
When an action force occurs, there is always a reaction force. Which of the following TWO terms describe the reaction force?
stronger
downward
opposite
weaker
equal
A chemical change happens when --
glass breaks into pieces.
dough bakes in an oven.
ice cream melts into a liquid.
electricity flows through a wire.
When the person pushes on the wall, and the wall pushes back, why does the person move and not the wall?
The wall has more mass
The person is pushing harder than the wall
The wall is pushing harder than the person
The skateboard is pushing on the person
When an unbalanced force acts on an object, the force ______________________.
changes the motion of the object
is cancelled by another force
does not change the motion of an object
is equal to the weight of the object
Which is an example of a chemical change?
A solid produced by a chemical reaction in solution that separates from the solution is called ---
(a)
If a person is picking up a book with the force of 50 N and the gravity is pulling down with 15 N, what is the net force?
50 N dup
35 N up
65 N up
35 N down
What type of change occurs when baking soda is mixed with vinegar and bubbles form?
a physical change because the substances are mixed
a chemical change because a gas is produced
a physical change because the mixture can be separated
a chemical change because the temperature increases
When a baseball player catches a ball, the ball pushes towards the glove; this is the action force. What is the reaction force?
The reaction force is the glove pushing back on the ball with a stronger force.
The reaction force is the glove pulling back on the ball with an equal force.
The reaction force is the glove pushing back on the ball with an equal force.
The reaction force is the ball pushing away from the glove with an equal force.
What observation would most likely indicate a chemical change has occurred?
A solid dissolves in a liquid
A liquid changes color and produces a gas
A gas is compressed into a smaller volume
A liquid freezes into a solid
Which change makes a new material?
molding a clay figure
breaking a drinking glass
crushing ice cubes
cooking eggs on a stove
Which of these always occurs during a chemical change?
change in state of matter
production of energy
forming bubbles
forming a new material
Which of the following scenarios represents a chemical change?
water changing from a liquid to a gas
sugar being stirred in a glass of water
bacteria converting lactose into simple sugars
food breaking down into smaller pieces through chewing
Which one only shows chemical changes?
*Leaves changing color
*water separating into hydrogen and oxygen
*mixing flour and sugar
*tarnish on a silver spoon
*sanding wood
*dry ice changing from a solid to a gas
*glass breaking
*tearing paper
Which answer shows signs of a chemical change only?
*substance floating
*change in shape
*change in state of matter
*unexpected change in temperature
*precipitate forming
*production of gas
*change in size
*unexpected color change
Allen pushes a toy car across three different surfaces. He pushes the car across a wooden floor, a tile floor, and a carpeted floor. He notices it is hardest to push the toy car across the carpeted floor. Which is the most likely reason it is hardest to push the car across the carpet?
The car has more mass when it is on the carpeted floor.
The carpet creates more friction than the other surfaces.
The car is affected most by gravity on the carpeted floor.
The carpet pushes more against the car than the other surfaces.
The diagram shows the projectile motion of a baseball that has left a pitcher's hand. The two motions shown in the diagram combine to form the curved path of the ball, shown by the line labeled R. What is happening with the force labeled S?
The force is gravity.
The force is friction.
The force is magnetism.
It is not a force.
Which one is a balanced force example?
A car accelerating to enter the highway.
A car traveling at constant speed
A car turning a corner.
A car stopping at a red light.
A girl is standing on a skateboard and facing east. If she bends her knees and jumps off the skateboard in the direction she is facing, which direction will the skateboard move?
north
south
east
west
Which of the following scenarios are examples of an action-reaction pair of forces?
a diver pushing down on the diving board while the diving board pushes down on the spring
a tennis racquet pushing on a ball while the ball pushes back on the tennis racquet
a boy climbing up a ladder and holding onto the rails while climbing
a girl flying into the air after pushing down on a trampoline while the force of gravity pulls her back down
Joni throws a tennis ball very hard against a solid wall. What happens after the ball hits the wall?
The ball loses all its energy and sticks to the wall.
The ball loses all its energy and falls straight down to the floor.
The energy of the moving ball pushes it away from the wall.
The energy of the moving ball pushes it toward the wall.
Makayla mixed two substances together in science class. Once they mixed, she noticed a precipitate (solid) was formed. On her lab report, she said that there was not a chemical reaction when she mixed the two substances. Is she correct?
Yes, because a new substance was formed (precipitate).
No, because a new substance was formed (precipitate).
Yes, because she mixed two things and that is a chemical reaction.
No, because there was no gas produced.
