8.5A and FMA review

Newton's Second Law

• Total net force acting on an object is equal to mass times acceleration

• F=m*a

• Force measured in Newtons or kg x m/s², mass is measured in kg, acceleration is measured in m/s²

• To convert g → kg = divide g by 1000

Three alternative ways to use the formula:

Multiple Choice

What is the force on a 1000 kg elevator that is falling freely at 9.8 m/sec²

• 102.04 n

• 9,800 n

• 980 n

• 103 n

Multiple Choice

What is the acceleration of a 50 kg object pushed with a force of 500 newtons?

• 100 m/s²
• 25,000 m/s²
• 10 m/s²
• 25 m/s²

Multiple Choice

A 50 kg skater pushed by a friend accelerates 5 m/sec².  How much force did the friend apply?

• 45 N
• 15 N 
• 10 N
• 250 N

Multiple Choice

A force of 250 N is applied to an object that accelerates at a rate of 5 m/sec².  What is the mass of the object?

• 100kg 
• 1,250kg
• 50kg
• 5kg

Multiple Choice

What are the units for force?

• m/s²

• N

• Kg

Multiple Choice

What are the units for mass?

• Kg

• m/s²

• N

Multiple Choice

What are the units for acceleration?

• N

• Kg

• m/s²

Multiple Choice

A cannon shoots a 40 kg ball at a sailing ship. It hits the other vessel with 2000 N of force. What was its acceleration?

• 50m/s²

• 5 m/s²

• 500m/s²

• 5,000m/s²

Atoms

physical science

The nucleus

the nucleus will have an overall charge of +1 because protons are positive and neutrons are neutral

Multiple Choice

What charge do electrons have?

• +1

• 0

• -1

Electron Cloud

• if the electrons are the only particles found in the electron cloud, the cloud will have an overall charge of -1

• 
  

Multiple Choice

What is the atomic number of this atom?

• 2

• 4

• 6

• 8

Multiple Choice

Name this element.

• Neon

• Magnesium

• Sodium

• Manganese