Florida Science Grade 6

Chapter 17: Motion, Forces, and Simple Machines

Motion, Forces, and Simple Machines

1.
Newton's second law of motion states that __________.
A)acceleration is calculated by dividing the force exerted on an object by the mass of the object, and that when a force acts on an object, its acceleration is in the same direction as the force
B)an object will remain at rest or keep moving in a straight line with constant speed unless a force acts on it
C)when a force is applied on an object, there is an equal force applied by the object in the opposite direction
D)the force on an object can be found by dividing its mass by its acceleration
2.
__________ is the speed of an object at any instant of time.
A)Average speed
B)Acceleration
C)Instantaneous speed
D)Velocity
3.
__________ is a force that resists motion between two surfaces that are in contact.
A)Friction
B)Inertia
C)Acceleration
D)Resistance
4.
If a runner maintains a constant speed of 12 km/h, how long will it take him to complete a marathon race of 26.2 miles?
A)3.14 h
B)3.52 h
C)2.18 h
D)5.3 h
5.
__________ is the change in velocity divided by the time needed for the change to occur.
A)Average velocity
B)Acceleration
C)Displacement
D)Speed
6.
A bicycle rider travels 15 km in 1.25 hours. What is the rider's average speed?
A)13.75 km/h
B)22.5 km/h
C)10.5 km/h
D)12 km/h
7.
The direction and speed of an object is described by its __________.
A)velocity
B)displacement
C)average speed
D)average displacement
8.
Force pairs act in __________ and are __________ in size.
A)the same direction, always equal
B)opposite directions, unequal
C)the same direction, unequal
D)opposite directions, always equal
9.
A __________ is a push or a pull.
A)force
B)acceleration
C)velocity
D)motion
10.
The __________ is the number of times a force is multiplied by a machine.
A)power
B)mechanical advantage
C)effort force
D)resistance force
11.
A change in motion is described by __________.
A)acceleration
B)net force
C)speed
D)inertia
12.
You are moving a dresser that has a mass of 36 kg; its acceleration is 0.5 m/s2. What is the force being applied?
A)35.5 N
B)18 N
C)72 N
D)1.8 N
13.
__________ measures the quantity of matter of an object.
A)Inertia
B)Mass
C)Density
D)Net force
14.
Newton's first law of motion states that __________.
A)when a force acts on an object, its acceleration is in the same direction as the force
B)an object will remain at rest or keep moving unless a force acts on it
C)when a force is applied on an object, there is an equal force applied by the object in the opposite direction
D)acceleration is calculated by dividing the force exerted on an object by the mass of the object
15.
A ball is thrown straight up in the air. According to Newton's first law of motion, what is the reason for the ball falling back to Earth?
A)It is accelerating in the same direction as Earth's gravitational force on it.
B)The change in the ball's acceleration is proportional to the force acting on it.
C)The ball exerts a force on the air surrounding it.
D)A force has acted on it.
16.
If a student leaves home at 7:30 A.M. to walk to his school 2 km away, stops at a neighbor's house for 15 minutes, then arrives at school at 8:00 A.M., what is the student's average speed for the trip to school?
A)2 km/h
B)4 km/h
C)8 km/h
D)2.67 km/h
17.
The __________ is the combination of all the forces acting on an object.
A)force pair
B)direction of motion
C)net force
D)inertia
18.
Which of the following tools is a lever?
A)screw
B)ax
C)ramp
D)shovel
19.
A machine that uses only one movement is a(n) __________.
A)simple machine
B)effort force
C)mechanical advantage
D)compound machine
20.
Which of the following is NOT an acceleration?
A)stopping your bike at an intersection
B)slowing your bike ride so you can make it up a hill
C)riding your bike straight down the street at a constant speed
D)riding your bike faster when you head down a hill
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