Physics 201

A force of 1N is:

C. 1kg·m/s2

Which of the following quantities is NOT a vector?

A. Mass

A feather and a lead ball are dropped from rest in vacuum on the Moon. The acceleration of the feather is: A. More than that of a lead ball B. The same as that of a lead ball C. less than that of a lead ball D. 9.8 m/s^2 E. zero since it floats in a vacuum

B

Mass differs from weight in that: A. all objects have weight but some lack mass B. weight is a force and mass is not C. the mass of an object is always more than its weight D. mass can be expressed only in the metric system E. there is no difference

B

The unit of force called the newton is:

B. 1kg·m/s2

The standard 1-kg mass is attached to a compressed spring and the spring is released. If the mass initially has an acceleration of 5.6m/s2, the force of the spring has a magnitude of:

B. 5.6N

The term "mass" refers to the same physical concept as:

B. Inertia

An example of an inertial reference frame is:

B. a frame attached to a particle on which there are no forces

11. The inertia of a body tends to cause the body to: A. speed up B. slow down C. resist any change in its motion D. fall toward Earth E. decelerate due to friction

C

A heavy ball is suspended as shown. A quick jerk on the lower string will break that string but a slow pull on the lower string will break the upper string. The first result occurs because: A. the force is too small to move the ball B. action and reaction is operating C. the ball has inertia D. air friction holds the ball back E. the ball has too much energy

C

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

C

The mass of a body: A. is slightly different at different places on Earth B. is a vector C. is independent of the free-fall acceleration D. is the same for all bodies of the same volume E. can be measured most accurately on a spring scale

C

When a certain force is applied to the standard kilogram its acceleration is 5.0m/s2. When the same force is applied to another object its acceleration is one-fifth as much. The mass of the object is: A. 0.2 kg B. 0.5 kg C. 1.0 kg D. 5.0 kg E. 10kg

D

In SI units a force is numerically equal to the _____ when the force is applied to it.

D. acceleration of the standard kilogram

An object moving at constant velocity in an inertial frame must:

D. have zero net force on it

Acceleration is always in the direction:

D. of the net force

16. The mass and weight of a body: A. differ by a factor of 9.8 B. are identical C. are the same physical quantities expressed in different units D. are both a direct measure of the inertia of the body E. have the same ratio as that of any other body placed at that location

E

Two objects, one having three times the mass of the other, are dropped from the same height in a vacuum. At the end of their fall, their velocities are equal because: A. anything falling in vacuum has constant velocity B. all objects reach the same terminal velocity C. the acceleration of the larger object is three times greater than that of the smaller object D. the force of gravity is the same for both objects E. none of the above

E

A newton is the force:

that gives a 1 kg body an acceleration of 1 m/s2