PHY 1000 - CM 1 - Quiz No. 1

It is defined as 9 192 631 700 times the period of oscillation of radiation from the cesium atom of the reference clock used to measure a unit of time.

• millisecond

• second

• minute

• hour

Which of the following statements are true?

• An object can move even when no force acts on it

• If an object isn’t moving, no external forces act on it.

• If a single force acts on an object, the object accelerates.

• If an object accelerates, a force is acting on it.

Consider the following controls in an automobile: gas pedal, brake, steering wheel. The controls in this list that cause an acceleration of the car are

• only the gas pedal

• the gas pedal and the brake

• only the brake

• all three controls

Which of the following objects can’t be accelerating?

• an object moving with a constant speed

• an object moving with a constant velocity

• an object moving along a curve

• none of these

Who formulated the laws that govern the motion of objects in free fall?

• Michael Faraday

• Isaac Newton

• Galileo Galilei

• Albert Einstein

An object with constant nonzero acceleration can never stop and remain at rest.

• true

• false

• perhaps

• no comment

It's possible for a slowing car to have s positive acceleration.

• true

• false

• perhaps

• no comment

A car must always have an acceleration in the same direction as its velocity.

• true

• false

• perhaps

• no comment

If speed is a scalar quantity and velocity is a vector, acceleration is?

• quantity

• scalar

• unit

• vector

The study of motion and of physical concepts such as force and mass is called _________.

• physics

• mechanics

• dynamics

• kinematics