1. An object moving at constant velocity in an inertial frame must:
A.have a net force acting on it
B.eventually stop due to gravity
C.not have any force of gravity acting on it
D.have zero net force acting on it
E.have no frictional force acting on it


2. A newton is the force:
A.of gravity on a 1 kg body
B.of gravity on a 1 g body
C.that gives a l g body an acceleration of 1 cm/s2
D.that gives a 1 kg body an acceleration of 1 m/s2
E.that gives a 1 kg body an acceleration of 9.8 m/s2


3. Acceleration is always in the direction:
A.of the displacement
B.of the initial velocity
C.of the final velocity
D.of the net force
E.opposite to the frictional force


4. An object placed on an equal-arm balance requires 12 kg to balance it. When placed on a spring scale, the scale reads 12 kg. Everything (balance, scale, set of masses and object) is now transported to the moon where free-fall acceleration is one-sixth that on Earth. The new readings of the balance and spring scale (respectively) are:
A.12 kg, 12 kg
B.2 kg, 2 kg
C.12 kg, 2 kg
D.2 kg, 12 kg
E.12 kg, 72 kg


5. A car travels east at constant velocity. The net force on the car is:
A.east
B.west
C.up
D.down
E.zero


6. A constant force of 8.0 N is exerted for 4.0 s on a 16-kg object initially at rest. The change in speed of this object will be:
A.0.5 m/s
B.2 m/s
C.4 m/s
D.8 m/s
E.32 m/s


7. A 6-kg object is moving south. A net force of 12 N north acting on it will result in the object having an acceleration of:
A.2 m/s2, north
B.2 m/s2, south
C.6 m/s2, north
D.18 m/s2, north
E.18 m/s2, south


8. A 9000 N automobile is pushed along a level road by four students who apply a total forward force of 500 N. Neglecting friction, the acceleration of the automobile is:
A.0.055m/s2
B.0.54 m/s2
C.1.8 m/s2
D.9.8 m/s2
E.18 m/s2


9. An object rests on a horizontal frictionless surface. A horizontal force of magnitude F is applied. This force produces an acceleration:
A.only if F is larger than the weight of the object
B.only while the mass suddenly changes from rest to motion
C.always
D.only if the inertia of the object decreases
E.only if F is increasing


10. An 1.5 N ball is thrown at an angle of 30° above the horizontal with an initial speed of 12 m/s. At its highest point, the net force on the ball is:
A.9.8 N, 30° below horizontal
B.zero
C.9.8 N, up
D.9.8 N, down
E.1.5 N, down


11. In a tug-of-war, two men each pull on the rope with 400 N forces, in opposite directions. The tension in the rope is:
A.400 N
B.800 N
C.zero
D.200 N
E.560 N


12. A 1000-kg elevator is rising and its speed is increasing at 3 m/s2. The tension in the elevator cable is:
A.6800 N
B.1000 N
C.3000 N
D.9800 N
E.12800 N


13. A 25-kg chair is pushed across a frictionless horizontal floor with a force of 200 N, directed 20° below the horizontal. The magnitude of the normal force of the floor on the chair is:
A.25 N
B.68 N
C.180 N
D.250 N
E.310 N


14. A block slides down a frictionless plane that makes an angle of 30° with the horizontal. The acceleration of the block (in cm/s2) is:
A.980
B.566
C.849
D.zero
E.490


15. A 25-N crate is held at rest on a frictionless incline by a force that is parallel to the incline. If the incline is 25° above the horizontal the magnitude of the normal force of the incline on the crate is:
A.4.1 N
B.4.6 N
C.8.9 N
D.11 N
E.23 N



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