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Physics: Newton's Laws Flashcards | StudBud
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Physics: Newton's Laws
Physics: Newton's Laws
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A #physics review on #force, #acceleration, #pressure, and #friction
Flashcards
35 cards
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Questions
35
Answers
1
A object weighing 10 N is falling and encounters 4 N of air resistance. The net force is
6 N downward
14 N downward
6 N upward
14 N upward
2
What force propels a rocket forward in the vacuum of space?
The rockets push against the exhaust
Exhaust being expelled in the same direction as flight
The friction between the rocket at particles in space
The escape of exhaust going out
3
How does the acceleration of an object relate to its mass?
Acceleration does not depend on mass
Directly proportional
Inversely proportional
4
All accelerations are produced by
velocities
masses
inertia
forces
5
Which of the statements about friction are
false
?
it is directly proportional to the normal force
it acts in a direction opposite to the motion of an object
it is indirectly proportional to the coefficient of friction
it comes from microscopic bumps between objects
6
How much pressure will you exert given: mass = 70 kg, area = 2 cm
2
178 N/cm
0.02 N/cm2
343.4 N/cm2
140 N/cm2
7
A 2,000 kg car is towed by a line 10° to the vertical. What is the tension in the line?
10,625 N
19,922 N
457,827 N
5,004 N
8
A hammer is used to hit a nail. During the collision _____
there is an equal force on the nail and hammer
there is only a force on the hammer
there is only a force on the nail
9
Which of the following would exert the most pressure?
All of these exert the same pressure
Pushups on your fists
Pushups on your fingertips
Pushups on your hands
10
An object is placed on an incline plane. How does the Normal force compare to the weight?
It is more than the weight
It is less than the weight
It is equal to the weight
11
One object has twice as much mass as another object. The first object also has twice as much
energy
inertia
gravitational acceleration
velocity
12
A 100 N lantern is suspended by a pair of ropes each 45° from the vertical. The tension in each
is 100 N
is less than 50 N
is more than 50 N
13
An object encounters 20 N of friction. The force needed to maintain constant velocity is
20 N
more than 20 N
less than 20 N
14
As a ball falls, the action is the Earth pulling on the ball. What is the reaction?
The ball pulling on the Earth
nonexistent in this case
Air resistance against the ball
The acceleration of the ball
15
How much will you accelerate a 100 kg punching bag if you hit it with a force of 2,000 N?
20,000 m/s2
1,000 m/s2
100 m/s2
20 m/s2
16
If the force of gravity suddenly stopped acting on the planets, they would
spiral slowly away from the sun
continue to orbit the sun
fly straight away from the sun
move in straight lines tangent to their orbits
17
The law of inertia applies to
moving objects
stationary objects
both moving and nonmoving objects
18
The law of inertia states that an object
at rest will remain at rest unless acted on by a force
all of the above
will move at a constant velocity unless acted on
will continue moving in a straight line unless acted on
19
A block is at rest on an incline plane. If you want to increase friction, what must happen?
Decrease the angle of incline
Neither, friction will be the same regardless
Increase the angle of incline
20
You push a 30 kg cart with a constant force of 90 N. What is the wagon's acceleration?
3 m/s2
0.05 m/s
100 m/s2
270 m/s2
21
An object following a straight line path at constant speed
must be moving in a vacuum
has no forces acting on it
none of the answers are correct
has zero net force acting on it
22
What is the mass of a dog if it weighs 100 N?
1 kg
100 kg
1,000 kg
10 kg
23
Pressure is defined as
Distance x time
meters/second
Force/Area
mass x acceleration
24
The weight of a person can be represented by a vector that acts
directly downward, regardless of position
a direction that depends on the position the person is in
parallel to the ground
only perpendicular to the surface
25
Equillibrium occurs when
When opposing forces have the same magnitude
The net force on an object is negative
When an object is accelerating
All of the forces acting on an object are positive
26
Your mass is 80 kg and encounter 200 N of air resistance. What is the resulting accel. you fall
16,000 m/s2
80 m/s2
7.5 m/s2
9.8 m/s2
27
Whenever an object exerts a force on another object, the second object _____
may or may not exert a force back on the first
only exerts a force if there is conservation of momentum
exerts an equal force in the same direction
exerts an equal force in the opposite direction
28
What would a 20 kg object weight on Jupiter if the accel. due to gravity is 24.5 m/s
2
?
490 N
1,345 N
10 N
200 N
29
A heavy person and a light person both parachute to the ground. Who hits the ground first?
The lighter person
Both at the same time
The heavier person
30
Negating air resistance, why does a tennis ball and billiard ball fall at the same rate?
They have the same force: mass ratio
They encounter an equal amount of gravitational force
They have the same mass
They have the same shape
31
You are hanging on a pair of ropes that are perfectly vertical. If you weigh 750 N, the tension
in each rope is 1,500 N
in each rope is 750 N
in each rope is 400 N
in each rope is 375 N
32
What happens to the tension in a rope that is supporting a weight as it becomes straight?
increases to infinity
Decreases to zero
Becomes half the objects weight
Starts to equal the weight of the object
33
Compared to the Earth, a 10 kg object on the moon will weigh
More
Less
Not enough information to determine
The same
34
After a cannonball is fired into frictionless space, the amount of force to keep it moving is
zero
the same force which it started
half the force which it started
twice the original force
35
An archer shoots an arrow. If the action force is the bowstring against the arrow, the reaction
is the arrow against the string
is the weight of the arrow
is air resistance against the arrow
is the archers hand on the string
