Complete Physics Assessment

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10 Random Physics Questions from our Complete Test Bank

10 - Physics Questions

10 questions from our bank of first semester material

1 / 10

How does padding make it safer for athletes on impact?

it decreases the change in momentum decreasing the force

it decreases the impulse decreasing the force

it increases the time of impact decreasing the force

It does not decrease the momentum since it does not decrease the mass, staring, or ending velocity. This is equal to impulse and therefore does not decrease that. It increases the time the force is applied for and thus decreases the force.

2 / 10

Which would change the momentum of an object the most.

double force and double time it is applies

triple force and decrease the time applied by a half

double force and keep time applied the same

one third the force applied for half the time

Impulse changes the momentum and the equation is J = Ft

Both force and time applied are directly related to impulse. Doubling both would create four times the impulse and would be the greatest of the choices.

3 / 10

What is the actual speed of a ball is thrown with an X component velocity of 7 m/s forward and a Y component of velocity of 30 m/s up when at the top of it's flight path?

30.1 m/s

10 m/s/s

35.2 m/s

7 m/s

At the top of a flight path the y component of velocity is 0 m/s temporarily so speed is only made up of the horizontal component. So 7 m/s here.

4 / 10

A scalar includes

magnitude

direction

both magnitude and direction

A scalar has a magnitude only which includes a number and unit (15 meters)

A vector has a magnitude and a direction (15 meters north)

5 / 10

John pushes a box up a ramp using a 10 m plank. The box moves a vertical distance of 2 m and weighs 500 N, ideally with how much force must he push?

100 N

0.01 N

10000 N

250 N

6 / 10

How far away should you place a 0.50 kg mass on the left side of a fulcrum to balance a 0.50 kg mass 0.10 meters and another 2.0 kg mass 0.50 m both on the right side of a fulcrum?

0.6 m

2.1 m

2.9 m

4.2 m

7 / 10

What happens to torque if you increase the distance a perpendicular force is applied on a lever from a fulcrum?

increases

decreases

stays zero

Ƭ = F_⟘d

Both perpendicular force and distance are directly related to torque

Increasing either increases the torque

8 / 10

Which direction does an object accelerate?

Always directed up

Always directed down

Always directed the direction of the net force

Acceleration is always in the direction of the net force. If you push a box to the right, with an overall or net force to the right, the object will accelerate to the right.

9 / 10

What is the air resistance force on a 1400 N skydiver at terminal velocity?

0 N

1400 N up

1400 N down

At terminal velocity net force is zero so air resistance must equal the skydivers weight or 1400 N but directed up

10 / 10

A 0.5 kg rock and a 150 kg boulder were dropped from a cliff 65 meters high. Which one would hit the ground first ignoring air resistance?

0.5 kg rock

150 kilogram boulder

both at the same time

Neglecting air resistance. Any mass would take the same time to hit the ground no matter how massive or minute. Many times a question may say in a vacuum which means there is no air resistance since air particles are sucked out removed from a vacuum.

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20 Random Physics Questions from our Complete Test Bank

20 - Physics Questions

20 questions from our bank of first semester material

1 / 20

An 145 kg astronaut at rest throws a 15 kg space rock 6 m/s. What is the final velocity of the astronaut?

0.62 m/s left

4.1 m/s left

3.2 m.s right

1.3 m/s left

2 / 20

What is the unit for momentum?

m/s

kg∙m/s

N∙m/s

3 / 20

A bullet shot horizontally at 1400 m/s lands 300 meters downrange. From what height was is shot from?

0.123 m

0.224 m

1.23 m

1.81 m

4 / 20

50 meters is a

magnitude

direction

both magnitude and direction

A magnitude includes a number and a unit

15 meters (15 is the number) (meters is the unit)

5 / 20

What is the east component of the vector above?

26 m/s

41 m/s

16 m/s

65 m/s

You are trying to find the adjacent and have an angle and the hypotenuse

6 / 20

Potential energy is dependent on __________________.

location

motion

heat

Location or height which is a type of location

how far you pull the a bow back or how high you lift an object

See types of distance and height in the equations below

Potential energy is equal to the work done, force applied over a distance, to store it (PE = Fd)

Gravitational potential energy is equal to its weight (mass times gravity) lifted a height to store it (GPE = mgh)

7 / 20

What is the unit of work?

The joule is the unit of work and all of the energies (ME, KE, PE, Heat)

8 / 20

Which would give the least torque if all forces applied at point A, B, C, and D were the same?

D's force is directed parallel to the lever, therefore produces no torque (no torque)

C's torque is the greatest distance and completely perpendicular (most torque)

A and B's torque is less than C but greater than D. Without knowing the angle for B or actual distance for A you can't determine which of these two is greater.

9 / 20

What is the force of attraction between Isaac Newton and his 0.15 kg apple the moment it is 0.3 meters away if his weight was 83.6 kg?

9.3 x 10^-9 N

2.8 x 10^-9 N

140 N

40 N

10 / 20

What is the spring constant of a spring displaced 0.1 meters when 400 N of force is applied?

40 N/m

4000 N/m

384 N/m

10 N/m

11 / 20

How much force is in a spring that has a spring constant of 4400 N/m that is displaced 0.03 m?

102 N

65 N

321 N

132 N

12 / 20

Solve for the tension in one of the ropes suspending the object above.

5.4 N

7.35 N

8.5 N

10.3 N

13 / 20

What is the tension in a rope suspending a 45 kg object? (use g = 9.8 m/s/s)

45 kg

441 N

0.218 N

221 N

Tension up would have the equal magnitude to the weight down

F_w = mg

F_w = (45)(9.8) = 441 N

14 / 20

What is the acceleration on a 5 kg object that has a force of 20 N applied to the right and 5 newtons applied to the left?

5 m/s/s right

3 m/s/s left

5 m/s/s left

3 m/s/s right

15 / 20

What is the acceleration of this object over the 30 second time period?

0.2 m/s/s

0.4 m/s/s

2.5 m/s/s

360 m/s/s

Slope of a velocity time graph is acceleration. Either find the slope or turn it into an equations picking givens off the graph (either way you are doing the same thing)

16 / 20

What type of motion is seen in this graph?

constant forward velocity

constant backwards velocity

rest

acceleration

deceleration

On a P/T graphs the slope is velocity. The slope here is flat so no velocity. Another way to think about it is by what is happening in the graph. The object went from 16 meters to 16 meters in 30 seconds. Therefore is in the same place and did not move.

17 / 20

One ball is thrown up and another is dropped. Which ball will have a greater acceleration after 2 seconds?

the ball thrown up

the ball dropped

both will be the same

The acceleration is always 9.8 m/s²down or averaged to 10 m/s²down

It does not matter what happened to get it there. Thrown up, dropped, or thrown down they all have different velocities but those velocities change by 9.8 m/s²down

18 / 20

Pick the right equation:

How far did Tony travel when he constantly accelerated from 5 to 15 m/s in 5 seconds?

How far is displacement or x

19 / 20

Which variable is bold in the following question:

How fast was Sam traveling if he is traveling at 16 m/s after accelerating at 2 m/s² for 25 meters?

A) v_i

B) v_f

C) a

D) t

E) x

F) v

the unit is (m/s) so its a velocity but there is acceleration so it is not just v

he is traveling at 16 m/s after accelerating at 2 m/s² so we know the final and the question asks for the initial

v_i = ?

20 / 20

Solve the problem using the right equation:

How fast was Sam traveling if he is traveling at 16 m/s after accelerating at 2 m/s² for 25 meters?

14.4 m/s

12.5 m/s

156 m/s

4.3 m/s

Your score is

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Stickman Physics Table of Contents: Use the search bar or click here to easily find a unit or topic
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Holdensclass.com: Video walk-through of Many Physics Concepts