Physics's Final Review

Review for Physics Final

Retake as many times as you need to review for the final exam!

Scalar vs. Vector

The mathematical quantities that are used to describe the motion of objects can be divided into two categories which can be distinguished from one another by their distinct definitions:

• Scalars are quantities that are fully described by a magnitude* alone.

• Vectors are quantities that are fully described by both a magnitude and a direction.

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*Magnitude only refers to the amount of something. If you have trouble remembering that, skip over the word and read the sentence again - it still makes sense!!

Multiple Choice

What is the definition of net force?

• a push or a pull that acts on an object

• Net force equal 0N and there is no change in the object's motion

• the overall force acting on an object after all the forces are combined

• The force does not equal 0N, the object accelerates

Multiple Choice

What do we call a force that has a net force of zero Newtons and the object does not change its motion?

• balanced force

• unbalanced force

• acceleration force

• net force

Multiple Choice

What is the magnitude and direction of the force in the free body diagram shown?

• 70 N right

• 70 N left

• 50 N right

• 50 N left

Multiple Choice

What is the magnitude and direction of the force in the free body diagram shown?

• 20 N, no change in motion

• 20 N right

• 20 N left

• 0 N , no change in motion

Multiple Choice

What is the magnitude and direction of the force in the free body diagram shown?

• 35 N right

• 17 N right

• 11 N right

• 5 N right

Multiple Choice

I was driving down Hwy 99 at 75mph. I saw a police officer, so I ______ my speed to 65 mph.

• increased

• maintained

• decreased

• doubled

Multiple Select

Velocity has two components

(pick 2 below)

• direction

• change in speed

• speed up

• slow down

Multiple Choice

If you are test-driving a Bugatti Veyron and you go from 0 km/s to 124 km/s in 3.7 seconds, what was your acceleration?

• 33.5 m/s²

• 0.03 m/s²

• -33.5 m/s²

• -0.03 m/s²

Multiple Choice

What does it mean when a change in velocity is negative?

• The object is speeding up.

• The object is slowing down.

• The object is changing direction.

• The object is falling down.

Multiple Choice

If you throw a baseball straight up, what is its acceleration at the highest point?

• 9.8 m/s²

• 9.8 m/s

• 0 m/s²

• 0 m/s

Multiple Choice

The shape of the path a projectile follows...

• circular

• linear

• wavy

• parabolic

Multiple Choice

In a projectile motion we always have...

• 1 component (x)

• 3 components (x,y, and z)

• 2 components (x and y)

• 0 components

Multiple Choice

The height of an object thrown into the air can be modeled by the formula h(t) = -16t² + 70t + 95, where h(t) is in feet after t seconds.
What is the height of the object after 5 seconds?

• 95 feet

• 45 feet

• 70 feet

• 171.56 feet

Multiple Choice

A ball is thrown into the air with an upward velocity of 100 ft/s. Its height, h, after t seconds is given by the function
 h = -16t² + 64t + 960.
How many seconds did it take for the ball to reach its maximum height?

• 10 seconds

• 64 seconds

• 960 seconds

• 2 seconds

Multiple Choice

A ball is thrown into the air with an upward velocity of 100 ft/s. Its height, h, after t seconds is given by the function
 h = -16t² + 64t + 960.
What is the maximum height?

• 960 feet

• 1008 feet

• 1024 feet

• 1152 feet

Multiple Choice

If a ball thrown straight up into the air takes 4 seconds to reach the top (peak), how long will it take to travel from the peak back to the original position?

• 0s

• 1s

• 3s

• 4s

Open Ended

How does the video clip justify that horizontal motion of a projectile is independent of its vertical motion?

Multiple Choice

If two projectiles are launched at two different heights, 2m and 10m, which one will reach the ground first?

• 2m

• 10m

• they both will hit the ground at the same time

Multiple Choice

What is the velocity of an object launched straight up at its highest point?

• zero

• equal to its v_x

• ½ its maximum value

• equal to gravity

Multiple Choice

A girl drops a 7 gram bowling ball and a 1gram rock from a cliff. Which will hit the ground first?

• Bowling Ball

• Rock

• Ignoring air resistance, both will hit at the same time.

• The cliff

Multiple Choice

Define acceleration due to gravity.

• The force of gravity acting on an object.

• The velocity of an object under the influence of gravity.

• The acceleration experienced by an object due to gravity.

• The force of gravity.

Multiple Choice

The acceleration of objects falling on Earth due to gravity is

• 9.8 m/s

• 9.8 m/s²

• 9.8 g/mL

• 9.8 g/m/m

Multiple Choice

A negative acceleration means that your object is _____. 

• not accelerating

• not moving

• speeding up 

• slowing down 

Multiple Choice

Who applies more Pressure on the ground, a ballroom dancer wearing high-heel shoes, or a basketball player wearing tennis shoes?

• The basketball player

• The woman wearing high-heel shoes

• No way to know

Multiple Choice

A car has a mass of 100kg.

What is the acceleration produced bg a force of 500N?

• 1000 m/ $$S^2$$  

• 5 m/ $$s^2$$  

• 2 m/ $$s^2$$  

Multiple Choice

inertia is the __________ to the state of motion

• resistance

• force

• acceleration

Multiple Choice

If an object is in free fall for three seconds, how fast will it be falling?

• 9.8 m/s

• 19.6 m/s

• 29.4 m/s

• 39.2 m/s

Multiple Choice

Juan is standing on the top observation deck of the Eiffel Tower in Paris at a height of 300 meters. He drops his cell phone. How fast will the phone be traveling when it hits the ground? Ignore the effect of air resistance.

• 9.8 m/s

• 76.68 m/s

• 149.76 m/s

• 46.99 m/s

Multiple Choice

 What is the unit called that measures force?

• weight

• meter

• Newton

• kilogram

Multiple Choice

Friction is a force that acts in an ___________ direction of movement.

• similar

• opposite

• parallel

• west

Multiple Choice

If the object is not moving and then the force applied is 5 N, what will happen?

• The block will not move

• The block will move at a constant velocity

• The block will move and continue to speed up

• The block will move, speed up, then slow down

Multiple Choice

If the object is not moving and then the force applied is 8 N, what will happen?

• The block will not move

• The block will move at a constant velocity

• The block will move and continue to speed up

• The block will move, speed up, then slow down

Multiple Choice

If the object is moving to the right and then the force applied is 3 N, what is the net force?

• 0 N

• 1 N to the right

• 1 N to the left

• 5 N to the right

Explanation Slide...

3 N to the right is being opposed by 4 N of kinetic friction to the left so 3 - 4 = -1 N. This is a net force of 1 N to the left.

Explanation Slide...

If the object isn't moving, static friction holding it in place. We need to pull harder than the maximum strength of static friction in order to make it move. Once we do that, the object will accelerate because we are pulling harder than the strength of kinetic friction which is now the friction of the situation.

Explanation Slide...

If the object isn't moving, static friction holding it in place. We need to pull harder than the maximum strength of static friction in order to make it move.

Difference between Distance and Displacement

• If the man in the first picture travels from Point A to the shop and back to Point A, what is the distance of the trip ?

• If the man in the second picture travels from point A to his friend's house what is the distance of his trip ?

Multiple Choice

Jerry walked from home to school, then from the school to the park. What is his total distance?

• 2 km

• 5 km

• 8 km

• 10 km

Multiple Choice

A ping-pong ball rolls forward 6 meters, and bounces backward 3 meters. It traveled a total distance of:

• 9 meters

• 6 meters

• 3 meters

• 0 meters