Review #2 - Physics (Momentum, Thermo, Electromagnetism)

If two objects have the same mass, then the faster moving object has ____________ momentum.

• more 
• less
• the same

The total momentum before a collision is _________ the total momentum after a collision.

• equal to 
• less than 
• more than
• It depends on the type of collision

When is momentum conserved in a collision?

• When the collision is inelastic.

• When the collision is elastic.

• When the collision is inelastic OR elastic but never an explosion.

• All collisions.

The equation to calculate momentum is

• p=mv
• p=1/2mv²
• p=mgh
• p=mg

Which of the following has the least amount of momentum?

• An ant walking along the ground
• An ant at rest
• An elephant walking
• An elephant running

Which object listed below has the greatest momentum?

• A 0.05 kg object rolling at 0.2 m/s.
• A 0.15 kg object rolling at 2 m/s.
• A 0.15 kg object rolling at 1 m/s
• A 0.4 kg object rolling at 2 m/s.

What is the formula for an explosion?

• m₁v_1i + m₂v_2i = m₁v_1f + m₂v_2f

• m₁v₁ + m₂v₂ = (m₁ + m₂)v_f

• 0 = m₁v₁ + m₂v₂

• (m₁v₁)(m₂v₂) = (m₁)v_f

Which way does heat flow?

• hot to cold
• cold to hot
• it doesn't 

What heat transfer happens when you burn your hand by touching a fire?

• Radiation
• Conduction
• Convectio
• I don't know!!!!!!!!!!!

Warm air rises and the cool air sinks demonstrates this type of heat transfer. 

• conduction
• convection
• radiation
• Insolation