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