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WorksheetsForce/Gravity/Friction
Total questions: 67
Worksheet time: 34mins
What is gravity?
a contact force
a frictional force
a magnetic force
a noncontact force
Which of these is considered a contact force?
the force between two magnets
the gravitational pull of a planet
the friction between an object and air
the force between two charged particles
A box has two forces acting on it. One force is 100 N upward. Another force is 50 N downward. What is the net force on the box?
50 N upward
100 N upward
50 N downward
100 N downward
Melanie watched the path a baseball followed after a pitcher threw it. She noticed that the ball traveled horizontally away from the pitcher as well as downward toward the ground. What force caused the ball to accelerate in the downward direction when it was thrown?
applied force
air resistance
electrical force
gravitational force
Why are some forces considered to be noncontact forces?
Objects must be far apart in order to exert a force.
Objects do not have to touch each other to experience a force.
Objects push each other apart to increase the distance between them.
Objects must be large in size in order to exert a force that is strong enough to notice.
Why is friction force considered to be a contact force?
Friction affects only solid objects.
Friction always acts in the same direction.
Friction is produced when objects slide past one another.
Friction acts in a direction opposite to the direction of an object's motion.
Why is the magnetic force considered to be a noncontact force?
Magnets must be far apart in order to exert a force.
Magnets do not have to touch each other to experience a force.
Magnets push each other apart to increase the distance between them.
Magnets must be large in size in order to exert a force that is strong enough to notice.
A bird flies at 12.5 meters per second. The wind speed is 4.5 meters per second. What is the speed of the bird when it flies with the wind?
12.5 m/s
4.5 m/s
17 m/s
8 m/s
A bird flies at 12.5 meters per second. The wind speed is 4.5 meters per second. What is the speed of the bird when it flies against the wind?
12.5 m/s
4.5 m/s
17 m/s
8 m/s
Which of these describes the gravitational force from a planet?
large and pulls objects toward itself
small and pulls objects toward itself
large and pushes objects away from itself
small and pushes objects away from itself
Which pair of objects has the largest gravitational force?
marble and car
marble and baseball
car and bowling ball
There is no gravitational force between any of these pairs of objects.
Sean is moving heavy furniture by sliding it across the floor. He puts a blanket underneath the furniture. Why did this help him?
The blanket protects the side of the furniture from bumping against the wall.
The blanket reduces the gravitational force between the furniture and the floor.
The friction is larger between the blanket and the floor than between the furniture and the floor.
The friction is smaller between the blanket and the floor than between the furniture and the floor.
Two basketballs are sitting 1m apart and are not moving. Which best explains why the gravitational force does not cause them to move?
No gravitational force exists between the two objects because they are not touching.
The gravitational force between the two objects is weak because they are 1m apart.
No gravitational force exists between the two objects because their masses are small.
The gravitational force between the two objects is weak because their masses are small.
In which situation is it better to have low friction?
a skydiver uses a parachute
a student walks down a hallway
a ladder leans against a wall
a hockey puck slides toward the goal
Planets A and B are both the same size, but planet B has three times the mass of planet A. How does the weight of an object compare on the two planets?
The weight of an object is the same on both planets.
The weight of an objects is three times larger on planet A.
The weight of an object is three times larger on planet B.
The weight of an object will depend on more factors than just the weight and size of the planet.
A push or pull exerted on an object that may change the motion or shape of the object; it has strength and direction
force
velocity
newton
acceleration
the SI unit for force (N)
newton
velocity
force
speed
the speed of an object in a particular direction
speed
acceleration
newton
velocity
the rate at which velocity changes over time
acceleration
speed
force
newton
an object ____________ if its speed, direction, or both change
accelerates
forces
contacts
speeds
the rate at which a distance is traveled
speed
velocity
acceleration
force
forces that only act between objects that are touching
contact forces
noncontact forces
forces that act at a distance
noncontact forces
contact forces
a force of attraction between objects that is due to their masses and that decreases as the distance between the objects increases
gravity
friction
weight
air resistance
a force that opposes motion between two surfaces that are in contact
gravity
weight
friction
air resistance
a measure of the pull of gravity on mass
gravity
weight
friction
air resistance
the force that opposes the motion of objects through air
gravity
friction
weight
air resistance
the sum of all forces acting on an object
gravity
net force
net friction
air resistance
How should you calculate the net force of two forces in the same direction?
only count the smaller force
subtract the smaller force from the larger force
only count the larger force
add the forces together
Which of the following is experiencing a net force of zero?
a racecar driving around a circular track
a pencil sitting on a desk
a rocket launching into space
a person jumping on a trampoline
What is the direction of the net force when one force is pulling down and one force is pushing to the right?
down
right
a combination of down and to the right
the object doesn't move
What happens to an object when opposite forces are exactly equal?
the object doesn't move
the object moves up
the object moves right
this cannot happen
Which could be an example of a balanced force?
an asteroid moving at a constant speed through space
a car accelerating from a stop sign
a box of dishes falling from a counter
a rocket taking off
A balanced force only occurs on an object that is not moving.
true
false
Which could be an example of an unbalanced force?
a plate sitting on a dining room table
a ball at the top of a hill that is not moving
Earth orbiting the Sun
a baseball that has been thrown to home plate
a parachutist falling to the ground
balanced
unbalanced
a soccer ball after it was kicked
balanced
unbalanced
a lamp sitting on a table
balanced
unbalanced
a train moving at a constant speed
balanced
unbalanced
a skier coming down a mountain
balanced
unbalanced
an apple hanging on a tree
balanced
unbalanced
a car accelerating from the start line
balanced
unbalanced
the moon orbiting the Earth at a constant speed
balanced
unbalanced
Forces have both strength and direction.
true
false
Forces can act on an object even when it is not moving.
true
false
What is the difference between speed and velocity?
Speed includes direction. Velocity does not include direction.
Velocity includes direction. Speed does not include direction.
In a force diagram, forces are represented by _______.
arrows
circles
squares
lines
The size of an arrow in a force diagram shows the _____ of the force.
strength
direction
The gravitational force Earth exerts on you is equal to the gravitational force you exert on Earth.
true
false
Are object's near Earth's surface attracted towards Earth's surface or its center?
surface
center
If we could build a tunnel through the Earth, would we ever reach the other size?
yes
no
The distance between two objects is measured from the _____ of one to the ______ of the other.
center, center
surface, center
center, surface
surface, surface
Do all objects have friction?
yes
no
When is friction greater?
when two surfaces are not moving
when two surfaces are moving
The ______ air resistance there is, the _______ an object will fall.
less, slower
more, slower
more, faster
Will I pass this test?!
yes
no
