Physics Module 1

An apple at rest weighs 1 N. The net force on the apple when it is in free fall is

1 N.

If no external forces are acting on a moving object, it will

continue moving at the same velocity.

Two tennis balls fall through the air from a tall building. One of them is filled with lead pellets. In presence of air-resistance, the ball to reach the ground first is the ----

lead-filled ball.

The force of friction on a sliding object is 10 N. The applied force needed to maintain a constant velocity is

10 N.

A ball is thrown upwards from the surface of the earth at the speed 10m/s. It returns to the same position. How long does it stay in the air (neglect the air resistance)?

2s

If the mass of an object does not change, a constant net force on the object produces constant

acceleration.

A skydiver jumps from a high-flying plane. As her velocity of fall increases, her acceleration

decreases.

The stretching out of time due to motion is called time

dilation.

A rock is thrown vertically into the air. At the very top of its trajectory the net force on it is

equal to its weight.

An object following a straight-line path at constant speed

has zero acceleration.

A heavy rock and a light rock of the same size are falling through the air from a tall building. The one that encounters the greatest air resistance is the

heavy rock.

If a non-rotating object has no acceleration, then we can say for certain that it is

in mechanical equilibrium.

In each second of fall, the distance a freely falling object will fall is

increasing.

While a car travels around a circular track at a constant speed, its

none of the above

While an object near the Earth's surface is in free fall, its

velocity increases.

Passengers in a high-flying jumbo jet feel their normal weight in flight, while passengers in the orbiting space shuttle do not. This is because passengers in the space shuttle are

without support forces.