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Chapter Three
Is it possible for an object to be moving when the net force is equal to zero?
Yes
No
If a person is hanging from a rope and she begins to pull herself up, what happens to the tension in the rope?
Decreases
Increases
Stays the same
A man with a mass of 100.0-kg is standing on a scale that reads Newtons in an elevator. If the scale reads 1080 N, what is the acceleration of the elevator?
+ 2.00 m/s^2
+ 1.00 m/s^2
- 2.00 m/s^2
- 1.00 m/s^2
Not enough Information
What would the scale read from the previous problem if the elevator is moving up at a constant speed?
1080 N
1000 N
1020 N
980 N
950 N
Two forces are acting on a box. One is acting North at 10.0 N, and the other is acting East at 20.0 N. Find the acceleration of the 50-kg box.
.50 m/s^2
.45 m/s^2
.45 m/s^2 27 dg NoE
.6 m/s^2 30 dg NoE
Not enough information
How much force is needed to make a 50.0-kg crate move on a floor where the static coefficient of friction is .6?
100 pounds
54 pounds
66 pounds
75 pounds
Not enough Info
How much force is needed to keep the crate from the previous problem moving at a constant speed once it starts moving? Kinetic coefficient equals .5.
50 pounds
55 pounds
60 pounds
65 pounds
70 pounds
What type of frictional force is utilized when you pump your breaks while coming to a stop in icy conditions?
Kinetic
Static
Applied
Breaking
Not enough Information
Does slamming on your breaks and locking the tires bring you to a stop faster than slamming on your breaks with anti-lock breaks which keeps the tires rolling?
yes
no
Which frictional force actually varies with the applied force?
Kinetic
Static