WorksheetsReview Forces, Chemical Changes
Total questions: 50
Worksheet time: 2hrs 36mins
Which has a STRONGER force of gravity, the Earth or the Moon?
Earth
Moon
What two things determine the gravity of an object?
mass & weight
mass & distance
density & mass
volume & distance
When will the forces of gravity between two objects be the GREATEST?
when the masses of both objects are small and the objects are far apart
when the masses of both objects are large and the objects are close together
when the masses of both objects are small and the objects are close together
when the masses of both objects are large and the objects are far apart
Which model has greater gravitational attraction.
Model A
Model B
Model A and B have the same amount of gravitational attraction.
If the type of surface is smoother, the distance traveled by the toy car will be (a)
There are deep treads on the tyre because they ___________.
increase the stopping distance of the car
reduce the amount of material used
increase friction
Friction produces _____________ to keep ourselves warm or to start a fire.
heat
heart
helium
hexagon
Magnetism is a force of ____________________________ that occurs between two _____________ objects.
attraction or repulsion, magnetic
external or internal, magnetic
external or repulsion, electronic
attraction or internal, electronic
The Earth produces its own ________ field.
spectrum
electric
magnetic
progressive
Every magnet has both a _________ pole and a __________ pole.
North, South
East, West
Positive, Negative
Positive, South
If two magnets are placed so that a north pole and a south pole are facing each other, they will _____________ each other.
date
spin
repel
attract
___________ forces always cause an object's motion to change.
balanced
unbalanced
contact
non-contact
Applied force is an example of a _________________ force.
contact
non-contact
balanced
unbalanced
An icy road has less __________ than a dry road.
friction
gravity
magnetism
water
When the net force is not 0 N, the forces are considered ____________
balanced
unbalanced
contact
non-contact
Which two characteristics do all forces have?
motion and size
size and direction
direction and speed
balance and direction
What type of force is this man using to push his grocery cart?
Normal Force
Gravity
Air Resistance
Applied Force
What is the unit to MEASURE force?
Kilogram
Meter
Pounds
Newton
A ____________ is a push or a pull on an object.
friction
force
magnet
gravity
The illustration below shows what happened when a balloon touched a girl’s hair.
Which type of force caused the girl’s hair to cling to the balloon?
magnetic force
frictional force
electrical force
gravitational force
frictional forcefrictional force
magnetic force
A contact force is from
objects physically touching
far apart objects
not touching object
always a pull
The three examples pictured are of
Non-contact Forces
Contact Forces
The force between the phone and the mount is a
contact force
non-contact force
Gravity is a
Contact Force
Myth
Non-contact Force
Friction is a
Contact Force
Myth
Non-contact Force
Which bar magnet will experience the greatest magnetic attraction?
Magnet 1
Magnet 2
Magnet 3
Magnet 4
What is the phase change from solid to liquid?
condensation
freezing
melting
evaporation
What forces act on a falling feather?
gravity pushing up and friction (air resistance) pulling down
gravity pulling down and friction (air resistance pushing) up
6. An ice cube melts because:
a. The ice freezes solid.
b. The ice dissolves in water
c. Heat is being added and the particles begin to vibrate
d. The particles bounce freely
On a hot summer day, you make a glass of refreshing sweet iced tea by combining boiling water, tea, sugar, and ice.
What type of change occurs and how do you know?
Physical change; sugar dissolves in the tea and water, but the chemical composition remains the same.
Physical change; sugar dissolves in the tea and water which breaks the bonds of the molecules
Chemical change; sugar dissolves in the tea and water due to heat being added to the water
Chemical change; sugar dissolves in the tea and water which breaks the bonds of the molecules
A student mixes two clear liquids together. After a few minutes, a white powdery solid can be seen settling on the bottom of the test tube. Which of the following is a conclusion that the student can draw based on these observations? The two clear liquids-
were pure substances before they were mixed
are toxic and should be handled with extreme caution
have gone through a chemical change in which a new substance called a precipitate was produced
have been stored too long and are no longer good
A student added white crystals to a clear liquid. The crystals dissolved in the liquid. After a few seconds, the liquid became quite warm and then turned bright red in color. Indications that a chemical change was taking place could be observed when –
the white crystals were added to the clear liquid.
the crystals dissolved in the liquid leaving only the liquid visible
There are no indications of chemical change
the temperature of the liquid increased and an unexpected color change occurred.
Neon is colorless, a poor conductor of heat and is not able to be stretched. How would it be classified?
Nonmetal
Metalloid
Metal
None of the above
A mixture in which we cannot see all the individual parts is called a...
Pure substance
Heterogeneous mixture
Homogeneous mixture
