Chapter 5: FORCE AND MOTION-I

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:

the ball has inertia

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:

12kg,2kg

A force of 1N is:

1kg·m/s2

The unit of force called the newton is:

1kg·m/s2

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:

5.0 kg

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:

5.6N

Which of the following quantities is NOT a vector?

Mass

An example of an inertial reference frame is:

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

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

acceleration of the standard kilogram

The mass and weight of a body:

have the same ratio as that of any other body placed at that location

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

have zero net force on it

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

inertia

The mass of a body:

is independent of the free-fall acceleration

18. 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:

none of the above

Acceleration is always in the direction:

of the net force

The inertia of a body tends to cause the body to:

resist any change in its motion

A newton is the force:

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

Mass differs from weight in that:

weight is a force and mass is not