3rd Nine Weeks Review

3rd Nine Weeks Review

Energy, Forces, Newton's Laws of Motion, and MOTION (speed, velocity, acceleration).

Motion

• Speed = Distance/Time

• Velocity = D/T with Direction

Multiple Choice

What is the speed of a jet plane that travels 528 meters in 4 seconds?

• 124 m/s

• 132 m/s

• 2112 m/s

Multiple Choice

If a comet flies at 50,000 km/hr for 4 hours, how far has it traveled?

• 20,000 km

• 12,500 km

• 200,000 km

• 1250 km

You can use position vs. time graphs to compare the motion of different objects. The steeper line on a position vs. time graph means a faster speed.

Multiple Choice

Another word used for position is?

• Distance or Displacement

• Displacement

• Placement

• Distance only

Acceleration

• Speed and acceleration are not the same thing.    You can also be accelerating and not moving!

• You can be moving (non-zero speed) and have no acceleration (think cruise control).

• You can also be accelerating and not moving!

• A falling object begins accelerating the instant it is released.

• A planet orbiting the Sun is always accelerating toward it. But rather than changing the planet's speed, the acceleration changes the planet's direction.

Acceleration

You need to know this formula

Multiple Choice

A train is traveling at a constant speed of 10 m/s. The train accelerates to 24 m/s in 4 seconds. What is its average acceleration?

• 3 m/s

• 3.5 m/s

• 8.5 m/s

• 7.5 m/s

Multiple Choice

How long will it take a train to accelerate from 55 m/s to 100 m/s at a rate of 4.5 m/s^2?

• 1 m/s

• 10 m/s

• 202.5 seconds

• 10 seconds

Multiple Choice

What is happening from 4 to 6 seconds?

• Constant Speed

• No movement

• Acceration

Multiple Choice

What is happening from 6 to 8 seconds

• Slowing down

• Returning to origin

• Acceleration

Know the order of forces

Multiple Choice

What is the force between a satellite and a planet?

• Strong Nuclear Force

• Electromagnetic force

• Gravitational Force

Know the different forces

• Applied force

• Tensional Force

• Friction force

• gravitational force

Know how to find weight given gravitational force

• Weight = mass x gravitational force

• 
  

• 
  

• 
  

Know about ME, PE and KE

• ME = KE + PE

• PE = mgh

• KE = 1/2 mv^2

Multiple Choice

If a rollercoaster is at its starting peak which statement is true

• There is no Kinetic Energy

• There is 1/2 PE and 1/2 KE

• There is only Kinetic Energy

Multiple Choice

What is the Potential energy of a 5 kg apple sitting at a height of 2 meters?

• 10 J

• 9.8 J

• 98 J

• 25 J

Multiple Choice

What is the Force on a book with a mass of 10 kg and an acceleration of 2.5 m/s squared

• 20.5 N

• 250 N

• .25 N

• 25 N

Net Forces and Equilibrium

Remember F=ma

Multiple Choice

what would the mass of this object be?

• 2 kg

• 1.2 kg

• 0 kg

• 12.0 kg