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Unit 2: Forces and Motion Flashcards | StudBud
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Unit 2: Forces and Motion
Unit 2: Forces and Motion
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Forces and Motion
Flashcards
27 cards
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Questions
27
Answers
1
When an object reaches terminal velocity its acceleration is
9.8m/s2
0m/s2
11.5m/s2
4.9m/s2
2
A woman weighing 550N sits on the floor. She exerts a force on the floor of
5.5N
55N
5500n
550N
3
Which of the following is the cause of an acceleration?
force
velocity
speed
inertia
4
What is the gravitational force acting on the car?
5800N
775N
14700N
13690N
5
A girl pulls on a 10kg wagon with a constant force of 20N. What is the wagons acceleration?
10m/s2
2m/s2
0.5m/s2
20m/s2
6
What happens when forces are unbalanced?
object remains stationary
object disappears
object moves
object boils or freezes
7
what is the force exerted by the ground on the bridge at the west end?
20
58
19
39
8
Force always occur as
in pairs
single quantities
by themselves
in triplets
9
The dog pulls Albert in the direction of the squirrel. Pick the statement that best describes
dog is moving in opposite direction of his force on leash
force exerted by Albert is greater than force of dog
Albert moves in the opposite direction of his force on leash
net force acts in direction away from squirrel
10
Why does the balloon rise?
force pulling down equals the force moving balloon up
force pulling down is greater than the force moving up
force of gravity does not act on the balloon
force moving up is greater than the down force
11
What causes a moving object to change direction?
acceleration
veloicty
force
inertia
12
The law of inertia applies to
objects at rest
objects in motion
objects at rest and in motion
objects that disappear
13
If the box is moving,
friction is greater than the applied force
the applied force is greater than friction
friction is not being overcome
no work is being done
14
One object has twice as much mass as another object. The first object also has twice as much
velocity
gravitational acceleration
inertia
all of the above
15
Friction is a force that always acts
in the same direction as an object's motion
opposite to an object's motion
friction doesn't exsist
perpendicular to an object's motion
16
What force acts against the upward motion of the balloon?
gravitational force
electrical force
magnetic force
centripetal force
17
A change in the gravitational force acting on an object will affect the object's
weight
inertia
coefficient of static friction
mass
18
The statement that for every action there is an equal but opposite reaction is what law?
fourth
first
third
second
19
The force that resists the motion of objects or surfaces in contact with one another is called
frictional
inertial
net
normal
20
A bag of sports equipment has a mass of 10kg and a weight of
980N
0.98N
98N
9.8N
21
If the stationary box begins to move,
it is accelerating
it experiences no change in velocity or acceleration
its acceleration is zero
its velocity changes but its acceleration doesn't
22
A net force of 6.8N accelerates a 31kg scooter across a parking lot. What is the acceleration?
0.22m/s2
3.2m/s2
0.69m/s2
4.6m/s2
23
Which pair of forces could represent x and y components for force P?
2
4
3
1
24
According to Newton's 3rd law, if you push gently on something it will push
on you only if you aren't moving
gently on you
on something only under the right conditions
gently on something else
25
Nancy weighs 480N and lifts a 60N box. What is the total force exerted on the floor?
420
540
480
60
26
What is the gravitational force acting on the balloon?
950N
4050N
1520N
5120N
27
If the box will not move,
the applied force is greater than friction
friction is equal to the applied force
the force applied to the box is zero
friction is being overcome
