Sem2 Review Lesson (Units 7-9)

Semester 2 Review Lesson

Fill out page 3-4 in your note packets as you work through the lesson

You are expected to fill out pages 3-4 in your Unit 10 (new) note packet as you complete this lesson

​

​Are your notes out?

Distance Time Graphs

Multiple Choice

What is happening to the object in this graph?

• It is not moving

• It is moving at a constant speed

• It is accelerating

Multiple Choice

Which line represents an object that is moving faster?

• Dotted

• Solid

What do you think the graph looks like of an object that has a positive acceleration (speeding up)?

​Graphs that start out slow, then get faster are said to be accelerating

​Graphs that start out fast, then get slower are said to be decelerating

Steps for finding slope:
1. Pick two points on the graph
2. Find their x,y coordinates
3. Plug coordinates into slope equation and solve

Slope Equation:

(y2 - y1) / (x2 - x1)

Multiple Choice

What is the velocity?

• 10 m/s

• 1 m/s

• 0.1 m/s

• 20 m/s

Multiple Choice

What is occurring from t=0 to t=4?

• at rest

• constant velocity

• acceleration

Multiple Choice

What is occurring during t=4 to t=8?

• at rest

• constant velocity

• acceleration

Multiple Choice

What is occurring during t=8 to t=10?

• at rest

• constant velocity

• acceleration

Multiple Choice

What is the speed during the interval t=10 and t=16?

• 10 m/s

• 0 m/s

• 5 m/s

• 4 m/s

Multiple Choice

What is the speed during the interval t=0 and t=4?

• 10 m/s

• 0 m/s

• 4 m/s

• 5 m/s

Laws of Motion

A Review

Force

This is a push or pull on an object

Multiple Choice

What is the unit for FORCE?

• N (Newtons)

• lbs (pounds)

• g (grams)

• m/s (meters per second)

Newton's First Law of Motion

The first law states that an object at rest will stay at rest and an object in motion will remain in motion at a constant velocity unless acted upon by an unbalanced force.

Forces can be balanced or unbalanced

When a force is balanced, it will move with a constant velocity (staying still or moving at the same speed)

When a force is unbalanced, it will accelerate in the direction of the larger force.

Net force is the combination of all the forces acting on an object. If the forces are going in the same direction they can be added on top of each other.

Multiple Choice

Balanced or Unbalanced?

• Balanced 
• Unbalanced

Multiple Choice

Forces that have a net force of zero

• Balanced force

• Unbalanced force

Multiple Choice

What is the net force?

• 10 N
• 0 N
• 25 N
• 1 N

Multiple Choice

When Izzy and Zoe pull on the rope with the same amount of force, the forces are _____.

• increased

• unbalanced

• balanced

• decreased

The first law of motion

is also called the law of inertia. The more mass an object has, the more inertia something has, REGARDLESS OF HOW FAST IT IS GOING.

​Inertia: The tendency of an object to keep doing what it is already doing

The second law of motion

states that the force = mass x acceleration

As force grows, mass or acceleration can grow.

However, if you are keeping the same force, as mass grows, acceleration will decrease or as acceleration increases, mass will decrease.

Multiple Choice

A force of 40 N acts upon a 2 kg block. Calculate the acceleration of the object.

• 20 m/s²

• 20 m/s

• 80 m/s²

• 80 m/s

Multiple Choice

An object with a mass of 100 kg is observed to accelerate at the rate of 5 m/s2. Calculate the force required to produce this acceleration.

• 20N

• 500 M/S

• 500 Kg

• 500N

The third Law of Motion

states that for every action, there is an equal and opposite reaction. In other words, for every action force, there is an equal and opposite reaction force that occurs.

Multiple Choice

Stacy is rowing a boat. She wants the boat to move forward. According to Newton's Third Law, in which direction should she move her paddle in the water?

• Backwards

• Above her head

• Forward

• East

Multiple Choice

A rocket pushes exhaust 10, 000 N. Without any other forces acting on the rocket, how much force does the rocket go forward?

• 15,000 N
• 1,000 N
• 10, 000 N

Multiple Choice

A baseball player bats a ball with a force of 1,000 N. The ball exerts a reaction force (without any additional forces action on it) against the bat of...

• Less than 1, 000 N
• 1,000 N
• More than 1,000 N

Multiple Choice

An archer shoots an arrow. The action force is the bowstring against the arrow, the reaction force is...

• Air resistance against the bow

• the arrow's push against the bowstring

• the grip of the archer's hand on the bow

Turn to page 4 and fill out the LEFT side of the page with the next slides

​These will be vocab terms for us this unit

​Turn the page

Match

Match each term to the correct definition

• Energy that comes from a vibrating source and moves through matter

• The energy from vibrating atoms and molecules

• Light Energy

• Energy stored in chemical bonds

• Energy from the movement of electrons

Sound Energy

Thermal Energy

Radiant Energy

Chemical Energy

Electrical Energy

• Sound Energy

• Thermal Energy

• Radiant Energy

• Chemical Energy

• Electrical Energy

Match

Match each term to the correct definition

• Energy from the distortion of an object (object being compressed or stretched)

• Energy due to position above the Earth

• Any kind of potential or kinetic energy

• Energy from an atoms nucleus decaying, or undergoing fission or fusion

• The ability to cause (or stop) motion and create forces

Elastic Energy

Gravitational Energy

Mechanical Energy

Nuclear Energy

Energy

• Elastic Energy

• Gravitational Energy

• Mechanical Energy

• Nuclear Energy

• Energy

Review Time

Use your unit 7, 8, and 9 note packets to help you answer the following questions

Multiple Choice

Velocity = _______________

• Speed – direction

• Speed + direction

• Speed x direction

• Speed / direction

Multiple Choice

At what speed would a car have to move in order to travel 20 kilometers in 2 hours.

• 5 km/hr

• 10 km/hr

• 20 km/hr

• 40 km/hr

Multiple Choice

Changing the speed and changing the direction of your bicycle are both examples of acceleration.

• TRUE
• FALSE

Multiple Choice

What is the speed of a car travelling 50m in 4s?

• 200 m/s

• 12.5 m/s

• 12.5 m

• 200m

Multiple Choice

How long does it take a car to travel 40m at 12m/s?

• 4.8 s

• 480 s

• 3.33 s

• 33.3 s

Multiple Choice

Name the missing force...

• frictional force
• weight force
• thrust
• buoyant force

Multiple Choice

Name the missing force...

• spring force
• weight force
• normal force
• buoyant force

Multiple Choice

What is the NET FORCE of this diagram?

• 17 N, right

• 17 N, left

• 23 N, right

• 12 N, up

Multiple Choice

The force exerted by ropes and chains is called

• tension

• normal

• elastic

• mechanical

Multiple Choice

Rockets are launched into space using jet propulsion where exhaust accelerates out from the rocket and the rocket accelerates in an opposite direction.

• Newton's 1st Law
• Newton's 2nd Law
• Newton's 3rd Law
• None of them

Multiple Choice

A 5 kg block is pulled across a table by a net force of 32 N. Calculate the acceleration of the object.

• 160 m/s²

• 6.4 m/s²

• 0.16 m/s²

Multiple Choice

If the mass of an object is 1000 kg on Earth, what is it's mass on the moon?

• 10kg
• 100kg
• 1000kg
• 10,000kg

Multiple Choice

The weight of a boulder on Neptune is 2,960 Newtons.  The boulder has a mass of 269 kilograms.  What is the acceleration due to gravity on Mars?

• 3.7 m/s/s
• 8.9 m/s/s
• 2.04 x 10⁶ m/s/s
• 11 m/s/s

Multiple Choice

Which object is fastest?

• Runner
• Walker
• Biker

Multiple Choice

What's the object's velocity in part A?

• 5 m/s
• 0 m/s
• 1 m/s
• 2 m/s

Multiple Choice

What's the object's velocity in part B?

• 5 m/s
• 0 m/s
• 1 m/s
• 2 m/s

Multiple Choice

What's the object's velocity in part C?

• 5 m/s
• -2 m/s
• 1 m/s
• 2 m/s

Multiple Choice

During which stage is the object moving away from its starting point?

• A

• B

• C

• D

• E

Multiple Choice

During which stage is the object moving toward its starting point?

• A

• B

• C

• D

• E

Multiple Choice

A dictionary weighing 15 Newtons is placed on a desk.

What is the force that the desk exerts on the dictionary?

• none

• 15 N

• 1.5 N

• 150 N

Multiple Choice

Which has the MOST inertia?

Multiple Choice

A force of 90N is applied to each cart below, which one will accelerate the fastest?

• Cart 1
• Cart 2
• Cart 3 
• Cart 4

Multiple Choice

During what period of time was Marie stopped?

• 0-5 minutes

• 5-10 minutes

• 10-25 minutes

• 25-30 minutes