Quiz about Momentum, Energy, Power and Machines

Question 1

What is the formula for mechanical advantage?

Accepted Answer

MA = Length of Effort Arm / Length of Resistance Arm

Answer

MA = Resistance Force / Effort Force

Answer

MA = Work Input / Work Output

Answer

All of the above

Question 2

What is the angular displacement of a fan blade that rotates at 6 degrees per second for 4 seconds?

Accepted Answer

24 degrees

Answer

30 degrees

Answer

36 degrees

Answer

40 degrees

Question 3

An objects momentum can be calculated by multiplying the velocity of the object by its_____.

Accepted Answer

mass

Answer

time

Answer

acceleration

Answer

length

Question 4

Which has a greater momentum a semi-truck at rest or a bicycle in motion?

Accepted Answer

bicycle

Answer

truck

Answer

neither has momentum

Answer

same

Question 5

Applying a force for a longer time increases the change in _________.

Accepted Answer

momentum

Answer

mass

Answer

gravity

Answer

time

Question 6

_______ is a change in momentum.

Accepted Answer

Impulse

Answer

Gravity

Answer

Mass

Answer

Distance

Question 7

When a golf club hits a golf ball, the change in momentum of the club is_______the change in momentum of the ball.

Accepted Answer

equal to

Answer

less than

Answer

greater than

Answer

none of the answers

Question 8

The momentum of a 225 g softball moving at 35 m/s is

Accepted Answer

7.9 kg m/s

Answer

3.5 N

Answer

5.0 m/s

Answer

2.1 kg m/s

Question 9

An 81 kg football player moving 6.5 m/s tackles and collides with a stationary 140 kg football player. What speed will the football players have the moment after impact?

Accepted Answer

3.8 m/s

Answer

0 m/s

Answer

4.8 m/s

Answer

2.4 m/s

Question 10

A 740 kg car traveling 19 m/s comes to a complete stop in 2.0 s. What is the force exerted on the car during this stop?

Accepted Answer

7000 N

Answer

85 N

Answer

850 N

Answer

9200 N

Question 11

The law of of____________ of momentum states that momentum is neither created nor destroyed.

Accepted Answer

conservation

Answer

gravitation

Answer

preservation

Answer

reservation

Question 12

The symbol for momentum in physics is the letter ___.

Accepted Answer

p

Answer

m

Answer

l

Answer

s

Question 13

If a wheel spins at 15 degrees per second for 3 seconds, what is the total angular displacement?

Accepted Answer

45 degrees

Answer

30 degrees

Answer

60 degrees

Answer

75 degrees

Question 14

A motor shaft rotates at 12 degrees per second for 2 seconds. What is the angular displacement?

Accepted Answer

24 degrees

Answer

12 degrees

Answer

36 degrees

Answer

48 degrees

Question 15

A bicycle wheel has a radius of 0.5 meters and moves at a linear speed of 10 m/s. What is its angular velocity?

Accepted Answer

20 rad/s

Answer

25 rad/s

Answer

30 rad/s

Answer

35 rad/s

Question 16

If a fan blade has a linear speed of 8 m/s and a radius of 0.2 meters, what is its angular velocity?

Accepted Answer

40 rad/s

Answer

50 rad/s

Answer

60 rad/s

Answer

70 rad/s

Question 17

A conveyor belt moves at a speed of 15 m/s. If the radius of the pulley is 0.6 meters, what is the angular velocity of the pulley?

Accepted Answer

25 rad/s

Answer

30 rad/s

Answer

35 rad/s

Answer

40 rad/s

Question 18

A car travels 100 m against a constant friction force of 200 N. What is the work done against friction?

Accepted Answer

2000 J

Answer

1000 J

Answer

500 J

Answer

400 J

Question 19

A 1 kg ball moving at 5 m/s collides inelastically with a stationary 2 kg ball. What is the final velocity of the combined mass after the collision?

Accepted Answer

1.67 m/s

Answer

2.5 m/s

Answer

3.33 m/s

Answer

4 m/s

Question 20

In a perfectly elastic collision, a 0.5 kg cart moving at 2 m/s collides with a stationary 1 kg cart. What is the final velocity of the 1 kg cart?

Accepted Answer

1 m/s

Answer

0 m/s

Answer

2 m/s

Answer

3 m/s

Question 21

A rake has an input arm of 0.4 meters and an output arm of 1.0 meters. What is the mechanical advantage of the rake?

Accepted Answer

2.5

Answer

0.4

Answer

1.0

Answer

4.0

Question 22

A broom has an input arm of 0.4 meters and a mechanical advantage of 0.5. What is the length of the output arm?

Accepted Answer

0.8 meters

Answer

0.2 meters

Answer

0.4 meters

Answer

1.0 meters

Question 23

A child's toy rake has an output arm of 0.75 meters and a mechanical advantage of 0.33. What is the length of the input arm?

Accepted Answer

2.25 meters

Answer

0.25 meters

Answer

0.75 meters

Answer

3.0 meters

Question 24

A wheelbarrow has an input distance of 0.99 m and an output distance of 0.45 m. What is the mechanical advantage of the wheelbarrow?

Accepted Answer

2.2

Answer

0.45

Answer

0.99

Answer

3.0

Question 25

Amanda can lift 600 N of bricks with a wheelbarrow using only 120 N of force. What is the mechanical advantage of the wheelbarrow?

Accepted Answer

5

Answer

2

Answer

4

Answer

6

Question 26

Marshall uses a lever to lift a 400 N stump. He weighs 250 N. What is the mechanical advantage of the lever he is using?

Accepted Answer

1.6

Answer

0.625

Answer

2.5

Answer

4.0

Question 27

A machine requires 120 J of input energy to do 35 J of useful work. What is the efficiency of the machine?

Accepted Answer

29.2%

Answer

35.0%

Answer

50.0%

Answer

75.0%

Question 28

A cyclist expends 900 J of work to produce 76 J of useful work. What is the efficiency of the cyclist?

Accepted Answer

8.4%

Answer

13.3%

Answer

27.5%

Answer

71.1%

Question 29

A force of 50 N is applied to the end of a lever to lift a 350 N rock. What is the mechanical advantage of the lever?

Accepted Answer

7.0

Answer

3.5

Answer

10.0

Answer

14.0

Question 30

A lever has an input arm of 4 meters and an output arm of 0.8 meters. What is the mechanical advantage of the lever?

Accepted Answer

5.0

Answer

1.6

Answer

2.5

Answer

4.0

Question 31

A lever has an input arm of 3 meters and an output arm of 2 meters. What is the mechanical advantage of the lever?

Accepted Answer

1.5

Answer

0.67

Answer

1.0

Answer

2.0

Question 32

A lever has an input arm of 2 meters and a mechanical advantage of 4. What is the length of the output arm?

Accepted Answer

0.5 meters

Answer

1.0 meters

Answer

2.0 meters

Answer

4.0 meters

Question 33

A lever has an output arm of 0.8 meters and a mechanical advantage of 6. What is the length of the input arm?

Accepted Answer

4.8 meters

Answer

0.13 meters

Answer

0.8 meters

Answer

2.4 meters

Question 34

Which formula relates work input and work output?

Accepted Answer

Efficiency = Work Output / Work Input * 100

Answer

Work = Force * Distance

Answer

Mechanical Advantage = Resistance Force / Effort Force

Answer

All of the above

Question 35

A 75 N bowling ball is carried horizontally across a 10 m room. How much work is done?

Accepted Answer

750 J

Answer

0 J

Answer

75 J

Answer

7500 J

Question 36

A force of 1 N moves a book 2 m. How much work is done?

Accepted Answer

2 J

Answer

0.5 J

Answer

1 J

Answer

3 J

Question 37

A force of 4.5 N is used to slide a book 2.7 J across a table. How far was the book moved?

Accepted Answer

0.6 m

Answer

1.0 m

Answer

2.7 m

Answer

4.5 m

Question 38

A child does 405 J of work to pull a sled 15 m up a hill. What force did the child exert on the sled?

Accepted Answer

27 N

Answer

9 N

Answer

15 N

Answer

40.5 N

Question 39

55,000 J of work is done to move a rock 25 m. What force was applied?

Accepted Answer

2200 N

Answer

1100 N

Answer

5500 N

Answer

11000 N

Question 40

What is the formula for Mechanical Advantage (MA) when considering the lengths of the effort and resistance arms?

Accepted Answer

MA = Length of Effort Arm / Length of Resistance Arm

Answer

MA = Resistance Force / Effort Force

Answer

MA = Work Output / Work Input

Answer

MA = Force Applied / Distance Moved

Question 41

If a rake has an input arm of 0.4 meters and an output arm of 1.0 meters, what is its mechanical advantage?

Accepted Answer

2.5

Answer

0.4

Answer

1.5

Answer

0.25

Question 42

How much work is done when a force of 1 N moves a book 2 m?

Accepted Answer

2 J

Answer

0 J

Answer

1 J

Answer

3 J

Question 43

What is the efficiency of a machine that requires 120 J of input energy to do 35 J of useful work?

Accepted Answer

29.17%

Answer

25%

Answer

30%

Answer

35%

Question 44

If a child does 405 J of work while pulling a sled up a hill over a distance of 15 m, what is the force exerted on the sled?

Accepted Answer

27 N

Answer

30 N

Answer

25 N

Answer

20 N

Question 45

A lever has an input arm of 4 meters and an output arm of 0.8 meters. What is its mechanical advantage?

Accepted Answer

5

Answer

4

Answer

3

Answer

2

Question 46

If a bulldozer does 567.6 J of work to push a mound of dirt 30.5 meters, what force does it apply?

Accepted Answer

18.6 N

Answer

20 N

Answer

25 N

Answer

30 N

Question 47

What is the mechanical advantage of a wheelbarrow if the input distance is 0.99 m and the output distance is 0.45 m?

Accepted Answer

2.2

Answer

1.5

Answer

3.5

Answer

1.2

Question 48

If a lever has an input arm of 3 meters and an output arm of 2 meters, what is its mechanical advantage?

Accepted Answer

1.5

Answer

2

Answer

3

Answer

0.67

Question 49

If a lever has a mechanical advantage of 4 and an input arm of 2 meters, what is the length of the output arm?

Accepted Answer

0.5 m

Answer

0.25 m

Answer

0.75 m

Answer

1 m

Question 50

What is the work done on a 75 N bowling ball when carried horizontally across a 10 m wide room?

Accepted Answer

0 J

Answer

750 J

Answer

75 J

Answer

1000 J

Question 51

If an input force of 202 N is applied to a wheelbarrow with a total weight of 444.4 N, what is the mechanical advantage?

Accepted Answer

2.2

Answer

1.5

Answer

0.45

Answer

0.33

Question 52

If a lever with an output arm of 0.8 meters has a mechanical advantage of 6, what is the length of the input arm?

Accepted Answer

4.8 m

Answer

5.6 m

Answer

6.8 m

Answer

7.2 m

Question 53

What is the work done when a force of 4.5 N moves a book and 2.7 J of work is performed?

Accepted Answer

0.6 m

Answer

0.5 m

Answer

0.7 m

Answer

0.8 m

Question 54

If a young boy applies a force of 2,550 N on his dog and is unable to move it, how much work did he do?

Accepted Answer

0 J

Answer

2550 J

Answer

5100 J

Answer

1275 J

Question 55

What is the mechanical advantage of a lever that lifts a rock weighing 350 N with a force of 50 N applied?

Accepted Answer

7

Answer

5

Answer

6

Answer

8

Question 56

If a wheelbarrow allows Amanda to lift 600 N of bricks with only 120 N of force, what is the mechanical advantage?

Accepted Answer

5

Answer

4

Answer

6

Answer

7

Question 57

If a bulldozer does 223 J of work to lift a rock with a force of 137 N, how far did the rock move?

Accepted Answer

1.5 m

Answer

2 m

Answer

3 m

Answer

4 m

Question 58

What is the efficiency of a cyclist who expends 900 J of work to produce 76 J of useful work?

Accepted Answer

8.44%

Answer

10.56%

Answer

12.67%

Answer

15.78%

Question 59

A 1500 kg car is westbound at a velocity of 33.0 km/h when it collides with a 2100 kg truck northbound at a velocity of 35 km/h. If these two vehicles lock together upon collision, what is the initial velocity of the vehicles after collision?

Accepted Answer

27.0 km/h

Answer

12.0 km/h

Answer

33.5 km/h

Answer

34.0 km/h

Question 60

A 3.8 kg object heading north at 3.0 m/s collides with a 7.0 kg object heading west at 3.5 m/s. If these two masses stick together upon collision, what is their velocity after collision?

Accepted Answer

2.0 m/s

Answer

1.0 m/s

Answer

3.0 m/s

Answer

3.25 m/s

Question 61

A 38000 N Truck moving west at a velocity of 7.0 m/s collides with a 28000 N truck heading south at a velocity of 5.0 m/s. If these two vehicles lock together upon impact, what is their velocity?

Accepted Answer

6.0 m/s

Answer

4.0 m/s

Answer

5.5 m/s

Answer

6.5 m/s

Question 62

A 70.0 kg object is moving east at an unknown velocity when it collides with a 60.0 kg stationary object. After collision, the 70.0 kg object is traveling at a velocity of 6.0 m/s 50.0o N of E and the 60.0 kg object is traveling at a velocity of 6.3 m/s 38oS of E. What was the velocity of the 70.0 kg object before collision?

Accepted Answer

10.0 m/s

Answer

5.0 m/s

Answer

7.5 m/s

Answer

12.0 m/s

Question 63

Determine whether the collision described in the previous question was elastic or inelastic.

Accepted Answer

Inelastic

Answer

Elastic

Question 64

A 14.0 kg penguin waddling east at a velocity of 7.0 m/s collides with a stationary 11.0 kg penguin. After the collision the 14.0 kg penguin is traveling at a velocity of 4.2 m/s 20.0o S of E. What is the velocity of the 11.0 kg penguin after collision?

Accepted Answer

5.0 m/s

Answer

2.0 m/s

Answer

3.5 m/s

Answer

6.0 m/s

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