WorksheetsChapter 3 8th Grade Science Putman
Total questions: 20
Worksheet time: 10mins
Name
Class
Date
1.
The upward force on an object falling through the air is ____.
a)
air resistance
b)
momentum
c)
terminal velocity
d)
inertia
2.
The relationship among mass, force, and acceleration is explained by ____.
a)
Newton's first law of motion
b)
Newton's second law of motion
c)
Newton's third law of motion
d)
conservation of momentum
3.
A feather will fall through the air more slowly than a brick because of ____.
a)
inertia
b)
gravity
c)
air resistance
d)
momentum
4.
In the absence of air, a penny and a feather that are dropped from the same height at the same time will ____.
a)
not have momentum
b)
fall at different rates
c)
float
d)
fall at the same rate
5.
The acceleration due to gravity is ____.
a)
9.8 m/s2
b)
98 m/s2
c)
0.98 m/s
d)
9.8 m/s
6.
According to Newton's second law of motion, ____.
a)
F = m x v
b)
F = m x a
c)
F = p x v
d)
F = p x a
7.
When an object moves in a circular path, it accelerates toward the center of the circle as a result of ____.
a)
frictional force
b)
momentum
c)
centripetal force
d)
gravitational force
8.
The path of a projectile is ____.
a)
straight
b)
always vertical
c)
always horizontal
d)
curved
9.
For any object, the greater the force that's applied to it, the greater its ____ will be.
a)
acceleration
b)
velocity
c)
gravity
d)
inertia
10.
The size of the gravitational force between two objects depends on their ____.
a)
speed and direction
b)
masses and the distance between them
c)
frictional forces
d)
inertia
11.
As you get farther from the center of Earth, your weight will ____.
a)
decrease
b)
remain the same
c)
increase
d)
inertiacan't tell from information given
12.
When a force is exerted on a box, an equal and opposite force is exerted by the box. These forces are called ____ forces.
a)
frictional
b)
gravitational
c)
action-reaction
d)
centripetal
13.
A real car moving at 10 km/h has more momentum than a toy car moving at the same speed because the real car ____.
a)
generates less friction
b)
has greater mass
c)
has greater forward motion
d)
has less mass
14.
In the equation p = m x v, the p represents ____.
a)
friction
b)
momentum
c)
inertia
d)
position
15.
The statement "to every action there is an equal and opposite reaction" is ____.
a)
the law of conservation of momentum
b)
Newton's first law of motion
c)
Newton's second law of motion
d)
Newton's third law of motion
16.
When two balls collide, the momentum of the balls after the collision is explained by ____.
a)
the law of conservation of momentum
b)
Newton's third law of motion
c)
Newton's second law of motion
d)
Newton's first law of motion
17.
A 300-N force acts on a 25-kg object. The acceleration of the object is ____.
a)
25 m/s2
b)
7,500 m/s2
c)
300 m/s2
d)
12 m/s2
18.
A 3,000-N force acts on a 200-kg object. The acceleration of the object is ____.
a)
15 m/s2
b)
150 m/s2
c)
26 m/s2
d)
50 m/s2
19.
An object that is in free fall seems to be ____.
a)
not moving
b)
speeded up by air resistance
c)
slowed by air resistance
d)
weightless
20.
If gravity did NOT affect the path of a horizontally thrown ball, the ball would ____.
a)
fall straight down
b)
follow a curved path
c)
go straight up
d)
travel horizontally
100 %
