Speed, Acceleration, Position, and Newton's 1st law

​Force, Acceleration, Speed, and Newton's First Law Review

An object accelerates when its velocity changes as a result of:

• Increasing Speed

• Decreasing Speed

• Change in direction (even if an object is traveling at constant speed)

Calculating Acceleration

• Acceleration= (Final Speed- Initial Speed)/ Total TIme

Friction

• "Friction is a force that counters all kinds of motion. It occurs whenever two surfaces come into contact."

Friction

• Friction is an opposing force that works against you in the opposite direction.

• There are 4 types of friction(Rolling, Sliding, Fluid, and Static)
  

Multiple Choice

friction is a force that acts 

• in the same direction as the motion

• opposite to the direction of the motion

• opposite to the applied forces

• the same direction as the applied force

Multiple Choice

What is Newton's First Law

• F=ma

• Every action has an equal and opposite reaction

• An object at rest stays at rest, an object in motion stays in motion. 

• Friction 

Multiple Choice

People falling forward in a car crash is an example of intertia.

• True

• False

Multiple Choice

Two people are pushing against opposite sides of a table with different forces. What is the result?

• Net Force

• Unbalanced Force

• Balanced Force

• Work

Multiple Choice

speed of an object in a particular direction

• motion

• velocity

• speed

• acceleration

Multiple Choice

when an object changes its position compared to a reference point.

• acceleration

• speed

• motion

• reference point

Multiple Choice

total distance traveled divided by total time taken to travel that distance

• velocity

• motion

• acceleration

• average speed

Multiple Choice

the rate at which speed or velocity changes

• acceleration

• average speed

• motion

• reference point

Multiple Choice

Is this a speed or acceleration graph?

• speed

• acceleration

Multiple Choice

What is happening at segment A?

• acceleration

• deceleration

• constant speed

• no motion/object at rest

Multiple Choice

What is happening at segment B?

• acceleration

• deceleration

• constant speed

• no motion/object at rest

Multiple Choice

The formula for calculating speed is...(x means multiply; / means divide)

• time x distance

• distance x speed

• distance / time

• time / distance

Multiple Choice

88 m/s

• Speed

• Velocity

• Acceleration

Multiple Choice

88 m/s north

• Speed

• Velocity

• Acceleration

Multiple Choice

88 m/s²

• Speed

• Velocity

• Acceleration

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

Changes in our speed, direction or both are called _________.

• gravity

• changes

• acceleration

• displacement

Multiple Choice

What is the definition of velocity?

• A force that opposes motion

• Uniform circular motion

• The speed of an object in a particular direction

Multiple Choice

What is this?

"This airplane is traveling at 500 mph, West"

• Speed

• Velocity

• Acceleration

Multiple Choice

If the sum of the forces equates to zero, they are considered as _____________.

• net force

• combined

• unbalanced

• balanced

Multiple Choice

What will cause an object to move?

• Applied forces

• Balanced forces

• Unbalanced forces

Multiple Choice

What is the magnitude (size) and direction of the net force?

• 14 N Down

• 14 N Up

• 6 N Up

• 6 N Down

Multiple Choice

What is the magnitude (size) and direction of the net force?

• 10 N to the Right

• 10 N to the Left

• 0 N

• 8 N to the Left

Multiple Choice

Which one is balanced?

• top

• bottom

• both

Multiple Choice

What is the unit for FORCE? 

• N (Newtons)

• lbs (pounds)

• g (grams)

• m/s (meters per second)

Multiple Choice

$$a=\frac{\Delta\upsilon}{t}$$  

An object at rest begins to move to a final speed of 30 m/s in 5 seconds. Calculate the object's acceleration.

• 6 m/s²

• -6 m/s²

• 150 m/s²

• 0.17 m/s²

Multiple Choice

$$a=\frac{\Delta\nu}{t}$$  

An object traveling at speed of 20 m/s increases to a speed of 80 m/s in 3 seconds. What is the object's acceleration?

• 20 m/s²

• -20 m/s²

• 33.3 m/s²

• 4 m/s

Multiple Choice

$$a=\frac{\Delta v}{t}$$  

An objects traveling at 10 m/s comes to a complete stop in 2 seconds. What is the objects acceleration?

• -5 m/s²

• 5 m/s²

• 0.2 m/s²

• 200 m/s²