Force and Motion Test Recap

Speed

Force and Motion Test Recap

Speed and Velocity

• Speed = Distance/Time

• When you divide the total distance of a trip by time you get the average speed

• Distance and displacement are not the same

• Instantaneous Speed is the actual speed at a given moment.

Multiple Choice

How far do you go if you drive for 3 hours at a speed of 60 miles per hour?

• 20 miles

• 180 miles

• 20 mph

• 180 mph

Vectors and Velocity

Distance is either zero or positive value

Velocity is speed with direction

Velocity is a vector, while speed is scalar

Each change in position is added up using positive and negative numbers.

Acceleration is measured in m/s²

Acceleration

Multiple Choice

Acceleration of an object happens when things ________

• slow down
• go faster
• change direction (turn)
• All of the above

Multiple Choice

Which is an example of velocity?

• A car driving 55 miles per hour south.

• A bicyclist traveling 10 meters per hour.

• A roller coaster is traveling 10 meters per second.

• A rocket blasting off at 2,500 meters per second.

Multiple Choice

Which of the following is NOT an example of acceleration?

• a person jogging at 3 m/s along a winding path
• a car stopping at a stop sign
• a cheetah running 27 m/s east
• a plane taking off

Multiple Choice

When a car goes around a corner at 20 mph, why do we say it accelerates?

• The car is accelerating because of the velocity is constant

• The car accelerates because it's going 20 mph

• Cars always accelerate when they are in motion

• The car is accelerating because it's changing direction

DISTANCE TIME GRAPHS

Constant Speed = straight diagonal line

No Motion (stopped) = flat line across

Acceleration = Curve

D/T Graph: Constant Speed

• A straight diagonal line means the object is moving at a constant speed (speed stays the same)

• The steepness of the slope tells you how fast the object is moving

• Line A is more steep than B, so A is moving faster than B.

Multiple Choice

Which of the following is going the fastest?

• A

• B

• C

• All of the the above

D/T Graph: Back to Start

• When a diagonal line goes down on a distance/time graph, this means the object is going back to the starting point at a CONSTANT speed.

• In this graph, the object left home, stopped, and then went back home.

Multiple Choice

Which point on the graph shows the object going back toward the start?

• A

• B

• D

• D

D/T graph: Acceleration

• Acceleration = curve

• Increasing speed = faster (curving up)

• Decreasing speed = slower (curving to flat line)

Multiple Choice

What is happening in this Distance/Time graph?

• acceleration: increasing speed

• no motion

• constant speed

• decreasing speed

D/T Graph: NO MOTION

A flat line shows no motion, the object is stopped or not moving

Multiple Choice

Which runner stopped during the race?

• A

• B

• C

• None

Speed/Time Graph

Constant Speed = flat line

Diagonal Up= faster

Diagonal Down = slower

Flat Line at the bottom = no motion (Speed = 0mph)

S/T Graph: Constant Speed

• Constant Speed on a SPEED/TIME GRAPH is a flat line

• This makes sense, because Speed is on the Y axis

• The area in red shows that the object stays moving 3 mi/h

Multiple Choice

Between which two points did the object stay at a constant speed?

• A to B

• B to C

• Both

• None

S/T Graph: Acceleration

• On a speed time graph, acceleration is shown with a diagonal line.

• A line up means going faster

• A line down means going slower

Multiple Choice

During which two points did the object accelerate(increase in speed)?

• A - B

• B - C

• C - D

• D - E

S/T Graph: No Motion

• Sorry it's blurry!

• On a SPEED/TIME graph, NO motion is a flat line at the very bottom

• At what speed do you travel when you're not moving? 0mph!

Multiple Choice

During which two points was the object at rest (not moving)?

• A - B

• B - C

• C - D

• D - E

Multiple Choice

What does the solid line on this graph represent?

• Constant speed

• Acceleration

• At rest

• deceleration

Multiple Choice

What is the line on this graph showing?

• moving away from starting point at a constant speed

• moving back towards the starting point at a constant speed

• acceleration (getting faster)

• deceleration (getting slower)

Multiple Choice

What is this line of this graph showing?

• moving away from starting point at a constant speed

• moving back towards the starting point at a constant speed

• acceleration (getting faster)

• deceleration (getting slower)

Multiple Choice

At 60 seconds, how far had this object traveled? 

• 0 m
• 10 m
• 20 m
• 40 m

Multiple Choice

What is the speed this motion?

• constant speed
• not moving
• speed increasing
• speed increasing at a constant rate

Multiple Choice

What happened during A to B point?

• not moving

• increasing speed at a constant rate

• moving at a constant speed

• acceleration

Multiple Choice

What happened during C to D point?

• not moving
• increasing speed at a constant rate
• moving at a constant speed
• moving at 0 m/s² acceleration

Multiple Choice

What happened during B to C point?

• deceleration

• constant speed

• at rest

• acceleration

Multiple Choice

what is the motion described in the graph

• all of above

• constant speed

• acceleration

• constant position

Force

o   A push or pull on an object.

o   Able to change the motion of an object.

o   Gravity, friction, and air resistance are three common forces on Earth.

Net Force

o   The overall force exerted on an object; measured in Newtons (N).

o   If the net force is 0, then a change in motion will not occur.

o   If the net force is greater than 0, then a change in motion will occur.

Unbalanced Forces

o   Unequal forces that cause a change in an object’s motion.

o   Cause a change in speed and/or direction of an object – moves the direction of the greater force.
o   Forces are unbalanced when the net force does not equal 0 Newtons.

Multiple Select

Find the Net Force and determine if the force is balanced or unbalanced.

Pick 2 answers

• 9N Right

• 3N Left

• Balanced

• Unbalanced

Multiple Choice

Which direction will the object move?

• Up
• Down
• Right
• Left

Multiple Choice

Calculate the Net Force. 

• 40N, Left
• 40N, Right
• 0N, Balanced
• 75N, Right

Match

Match the following

• Objects in motion will remain in motion, and objects at rest will remain at rest unless acted on by an external force.

• The net force on an object equals the product of its mass and acceleration.

• For every action, there is an equal and opposite reaction.

Newton's 1st Law

Newton's 2nd Law

Newton's 3rd Law

• Newton's 1st Law

• Newton's 2nd Law

• Newton's 3rd Law

Drag and Drop

Forces that cancel each other are called ​

Placeholder

Drag these tiles and drop them in the correct blank above

balanced forces

inertia

neutral forces

action and reaction

Multiple Choice

Which one of Newton's Laws best fits the statement,

"When you push an object, it pushes back."?

• Newton's 1st Law of Motion

• Newton's 2nd Law of Motion

• Newton's 3rd Law of Motion

• Newton's 4th Law of Motion

Multiple Choice

Which one of Newton's Laws best fits the statement,

"More mass means more force needed to accelerate."?

• Newton's 1st Law of Motion

• Newton's 2nd Law of Motion

• Newton's 3rd Law of Motion

• Newton's 4th Law of Motion

Multiple Choice

A soccer ball is sitting in the middle of a field. The ball will remain at rest until an outside force like a players foot or the wind acts upon it. Which of Newton's laws is represented by this?

• 1st

• 2nd

• 3rd

Multiple Choice

Sally jumps on her trampoline. She exerts a force on the trampoline and the trampoline exerts an equal but opposite force back on Sally. This represents

• Law 1

• Law 3

• Law 2

Multiple Choice

When you are running. your foot exerts force on the ground and the ground exerts force back onto you. Which of Newton's laws is represented

• 1st

• 2nd

• 3rd

Multiple Choice

If we put the same force on a bowling ball and a soccer ball, the soccer ball will move faster! Which law explains this?

• 1st

• 2nd

• 3rd

Multiple Choice

What is the attractive force that exists between all objects that have mass?

• Weight
• Mass 
• Gravity
• Viscosity

Multiple Choice

Which is an example of the law of inertia?

• A rocket taking off from Earth

• A crash test dummy flies through the windshield in a collision

• A small rock skips on a pond faster than a large rock

Multiple Choice

Which is an example of the law of action/reaction?

• A rocket taking off from Earth

• A crash test dummy flies through the windshield in a collision

• A small rock skips a pond faster than a large rock

Multiple Choice

Which example below BEST illustrates Newton's 3rd Law of Motion?

Multiple Choice

If you double the mass of an object with the same force apply on it, the acceleration will

• double
• cut in half
• the same
• zero

Multiple Choice

A 20 kg bike accelerates at 10 m/s².  what was the net force

• 25 Newtons
• 20 Newtons
• 200 Newtons
• 10 Newtons

Multiple Choice

What is the net force?

• 5000 N right
• 4000 N right
• 40 N left
• 4000 N left

Multiple Choice

Which law does this image represent?

• 1st Law

• 2nd Law

• 3rd Law

Multiple Choice

Which law does this image represent?

• 1st Law

• 2nd Law

• 3rd Law