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Physical Science Ch 12 Forces
Test Description: Ch 12 Review
Instructions: Answer all questions to get your test result.
1) The SI unit of force is the
A
kilogram
B
newton
C
joule
D
meter
2) Which of the following relationships is correct?
A
1 N =1 kg
B
1 N = 1 kg x m/s
C
1 N = 1 kg x ,m
D
1 N = 1 kg x m/s2
3) When an unbalanced force acts on an object,
A
the inertia of the object increases.
B
the weight of the object decreases
C
the object's motion does not change
D
the object accelerates
4) When a pair of balancedforces act so an object, the net force that results is
A
equal to zero.
B
equal in size to one of the forces
C
greater in size than one of the forces.
D
greater in size than both forces combined.
5) What kind of friction occurs as a fish swims through water?
A
fluid
B
sliding
C
static
D
rolling
6) As you push a cereal box across a tabletop, the sliding friction acting on the cereal box
A
equals the weight of the box.
B
acts in the direction of motion.
C
acts in the direction opposite of motion.
D
is usually greater than static friction.
7) The forces acting on a falling leaf are
A
gravity and static friction
B
air resistance and fluid friction
C
gravity and air resistance
D
weight and rolling friction.
8) An open parachute increases air resistance of a falling sky diver by
A
increasing surface area
B
increasing the terminal velocity
C
reducing fluid friction
D
decreasing the weight of the diver
9) Projectile motion is caused by
A
an initial forward velocity
B
a final vertical velocity
C
the downward force of gravity and an initial forward velocity.
D
the downward force of gravity.
10) The property of matter that resists changes in motion is called
A
gravity
B
weight
C
friction
D
inertia
11) An orange might roll off your cafeteria tray when you stop suddenly because of
A
the friction forces acting on the orange
B
the balanced forces acting on the orange
C
the centripetal force acting on the orange
D
the orange's inertia
12) According to Newton's second law of motion, the acceleration of an object equals the net force acting on the object divided by the object's
A
momentum
B
velocity
C
mass
D
weight
13) If a force of 12 N is applied to an object with a mass of 2 kg, the object will accelerate at
A
0.17 m/s2
B
24 m/s2
C
12 m/s2
D
6 m/s2
14) Your weight equals your
A
mass times the acceleration due to gravity
B
mass
C
mass times your speed
D
mass divided by the net force acting on you.
*select an answer for all questions
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