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Physics: Laws of Motion Flashcards | StudBud
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Physics: Laws of Motion
Physics: Laws of Motion
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Review of definitions and word problems about force, friction, gravity, and Newton´s laws of motion
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Questions
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Answers
1
The gravitational force between you and Mercury is larger than you and Saturn
False
True
2
What is a term for the forces that two objects exert on each other?
net force
unbalanced force
balanced force
force pair
3
If you triple the force of an object, the acceleration will be half
False
True
4
Which of the following is NOT a vector
speed
weight
acceleration
Force
5
The following picture is an example of
elastic collition
weight
net force
inelastic collition
6
What happens when unbalanced forces act on an object?
the object speeds up
friction becomes greater than the net force
the net force is zero
the object accelerates
7
Weight is the amount of mass of an object and is measured in kg
False
True
8
An object with a mass of 9kg has an acceleration of 3 m/s
2.
.
The force acting on it is 3N
True
False
9
A push or pull is:
Gravity
acceleration
Force
Friction
10
What happens when unbalanced forces act on an object at rest?
the object remains at rest
The object moves without direction
the object moves in the opposite direction of the net force
the object moves in the direction of the net force
11
What is the weight of a 50 kg woman on the moon (given the moon´s gravity is 1.6 m/s
2
)?
80 N
80 kg
80 kgm/s
-80 kgm/s2
12
An object´s weight is ____ to its mass
more than
proportional
less than
is equal
13
How do you calculate the gravitational force between two objects
F= mC2
F =√m1 m2 / r
F= G (m1 m2 / r2)
F = C q1 q2 / r2
14
what is the net force of this box?
10 N to the left
170 N to the right
10 N to the right
170 N to the left
15
What is the net force?
17 N
-3 N
-17 N
3 N
16
Which scientist postulated heliocentrism?
Copernicus
Kepler
Newton
Galileo Galilei
17
A wildebeest moves at 15 m/s. Then it starts to accelerate and 10 s after its velocity is 25 m/s. What is a=?
acceleration = 1 m/s2
acceleration = -4 m/s2
acceleration = -1 m/s2
acceleration = 4 m/s2
18
Gravity is an example of what type of force?
non-contact
anti-social
social
contact
19
Which law states that an object in motion tends to stay in motion unless an external force acts upon it.
Theory of universal gravitation
Newton´s third law of motion
Newton´s first of law of motion
Newton´s second law of motion
20
Physicist and Mathematician that explained the laws of motion and the theory of gravity
Isaac Newton
Albert Einstein
René Descartes
Galileo Galilei
21
Which is true according to the 2nd law of motion
a = F/m
F*m = a
m = F*a
F = m/a
22
Which branch of physics studies describes the motion of objects without considering the forces acting on them.
Kinematics
Dynamics
Optics
Biomechanics
23
What is a measure of how hard it is to stop a moving object?
momentum
gravity
inertia
weight
24
the momentum of a group of objects changes during elastic collisions but not during inelastic collisions
True
False
25
The mass of a man is less on the moon´s surface than in Earth because of the moon´s gravity of 1.6 m/s
2
True
False
26
what kind of objects have inertia?
all objects with anti-matter
all objects at rest
all objects with mass
all objects in motion
27
Calculate the force of an object that has a mass of 12 kg and an acceleration of 4 m/s
2
.
24N
3N
48 N
16N
28
The following picture is an example of an inelastic collision
True
False
29
Friction is an example of what type of force?
social
Contact
anti-social
Non-contact
30
What is the momentum of a 250 kg rock tumbling at 10 m/s?
2500 kg m/s
2500 m/s2
2500 m/s
2500 N
31
Heavy objects fall faster than light objects
False
True
32
For an object moving in a circle, what is the direction of centripetal force?
opposite the direction of motion of the object
away from the center of the circle
in the direction of motion of the object
towards the center of the circle
33
when a force is applied on an object, there is an equal force applied by the object in the opposite direction
Newton's 1st law of motion
Newton's univeral law of gravitation
Newton's 3rd law of motion
Newton's 2nd law of motion
34
Which is
not
one of Keplers laws?
Planets do not move with constant speed along orbits
Planetary orbits are not elliptical
Radius vector from the sun to a planet sweeps equal areas in equal times
Period for a planet to orbit the sun increases with the radius of its orbit
35
When these marbles collide, what force is experienced by each marble?
The force on each is 0.1 in opposite directions.
The force on each is 0.1 N to the right
The force on each is 0.1 N to the left
The force on the small marble is > the force on the larger marble
36
This equation goes with which law?
2nd law of motion
universal law of gravitation
3rd law of motion
1st law of motion
37
An objetct moves with unknown Vi. At t=0 it starts to accelerate at 1 m/s
2
. After 10 sec moves at 210 m/s, what is Vi?
Vi = Vf + a*t; Vi = 220 m/s
Vi = -a*t-Vf; -220 m/s
Vi = a*t - Vf; Vi = -200 m/s
Vi = Vf - a*t ; Vi = 200 m/s
38
The quantity of matter in something is
Mass
Weight
Anti-matter
Gravity
39
the following picture is an example of fluid friction
False
True
40
Which measures an object's tendency to resist changing its motion?
mass
gravity
inertia
acceleration
41
Forces have magnitud but no direction
False
True
42
Which of the following is NOT an example of circular motion
yo-yo on a string doing the around the world trick
moon´s path around the earth
car accelerating into a freway
car turning a corner
43
The strength of the gravitational force between two objects depends on which of the following:
The mass of the larger object
the orbits of the objects
The mass of the objects and the distance between them
The velocities of the objects
