Quiz about Physical Science Unit 1 Preassessment

Question 1

A box sliding down an inclined plane attains a velocity of 27 m/s in 3 seconds from rest. Find the acceleration.

Accepted Answer

9 m/s2

Answer

30 m/s

Answer

24 m/s2

Answer

81 km/hr

Question 2

In a tug of war the left team pulls with a force of 200N. The right team pulls with a force of 150N. What is the resultant force?

Accepted Answer

50N to the left.

Answer

350N to the left.

Answer

350N to the right.

Answer

50N to the right.

Question 3

If the cars collide INELASTICALLY, how would they move afterward (if at all)?

Accepted Answer

They would STICK TOGETHER and move RIGHT

Answer

They would BOUNCE OFF and move LEFT

Answer

They would STICK TOGETHER and move LEFT

Answer

They would BOUNCE OFF and move RIGHT

Question 4

The definition of momentum is

Accepted Answer

Mass in Motion

Answer

The size of an object

Answer

The velocity of an object

Answer

A comparison between two objects

Question 5

What is the TOTAL MOMENTUM for the system BEFORE COLLISION?

Accepted Answer

10 kg m/s

Answer

14 kg m/s

Answer

24 kg m/s

Answer

-24 kg m/s

Question 6

Collision where objects collide, and stick together.

Accepted Answer

inelastic collision

Answer

explosion

Answer

elastic collision

Answer

none of these

Question 7

What is the formula for Newton's second law of motion?

Accepted Answer

$$F = m \cdot a$$

Answer

$$F = m \cdot v$$

Answer

$$F = m \cdot g$$

Answer

$$F = m \cdot t$$

Question 8

Which of the following best describes the principle of momentum conservation?

Accepted Answer

The total momentum of a system remains constant when no net external force acts on it.

Answer

Momentum is always lost in a collision.

Answer

Momentum is conserved only when external forces act on the system.

Answer

Momentum is the same as kinetic energy.

Question 9

Design a simple device to minimize the force on an egg during a collision. Which of the following principles would be most important to consider?

Accepted Answer

Increasing the time of impact

Answer

Increasing the mass of the egg

Answer

Decreasing the time of impact

Answer

Decreasing the mass of the egg

Question 10

Which of the following is a unit of force?

Accepted Answer

Newton

Answer

Kilogram

Answer

Meter per second squared

Answer

Joule

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