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Physics Calculations Assignment

Total questions: 52

Worksheet time: 3hrs 49mins

Name
Class
Date
1.
To calculate average speed you _______ the distance traveled by the elapsed time.
a)
divide
b)
multiply
c)
square
d)
subtract
2.
The formula for speed is:  Speed= Distance/Time
To work it out you need to...
a)
Add the distance and time
b)
Multiply the distance and time
c)
divide distance and time 
d)
subtract distance and time
3.

A train travels 25 km in 5 hrs. How fast is the train going?

a)

25 miles/hr

b)

5 km/hr

c)

5 m/s

d)

50 km/hr

4.
A worm traveled 50 centimeters in 5 minutes.  What is the average speed of the snail?
a)
10 cm/m
b)
25 cm/m
c)
250 cm/m
d)
1 cm/m
5.
Car #1 that traveled 160 kilometers in 5 hours, and Car #2 traveled 140 kilometers in the same time. Which car traveled faster?
a)
Car #1
b)
Car #2
c)
Their speeds are equal.
6.
What is this graph representing?
a)
Constant Speed
b)
Acceleration (speeding up)
c)
Deceleration (slowing down)
d)
No motion
7.
What two measurements are necessary for calculating speed?
a)
Mass and time
b)
Temperature and mass
c)
Mass and distance
d)
Distance and time
8.
At 60 seconds, how far had this object traveled? 
a)
0 m
b)
10 m
c)
20 m
d)
40 m
9.
How long did it take this object to travel 10 m?
a)
0 s
b)
10 s
c)
15 s
d)
20 s
10.
What is happening in this graph from point B to C?
a)
The object is going down a hill.
b)
The object is returning to its starting location.
c)
The object is slowing down.
d)
The object is staying still.
11.
What is happening in this graph from point A to B?
a)
The object is accelerating.
b)
The object is not moving.
c)
The object is decelerating.
d)
The object is moving at a constant speed.
12.

a=Δυta=\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.

a)

6 m/s2

b)

-6 m/s2

c)

150 m/s2

d)

0.17 m/s2

13.

a=Δνta=\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?

a)

20 m/s2

b)

-20 m/s2

c)

33.3 m/s2

d)

4 m/s

14.

a=Δvta=\frac{\Delta v}{t}  

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

a)

-5 m/s2

b)

5 m/s2

c)

0.2 m/s2

d)

200 m/s2

15.

a=Δvta=\frac{\Delta v}{t}  

An object traveling at 80 m/s slows to a speed of 30 m/s in 5 seconds. What is the object's acceleration?

a)

-10 m/s2

b)

10 m/s2

c)

6 m/s2

d)

-10 m/s

16.

Force is a -

a)

push or pull

b)

only a push

c)

only a pull

d)

none of the above

17.
How much force is needed to accelerate a 3kg skateboard at 5m/s2. 
a)
8N
b)
1.6N
c)
0.6N
d)
15N
18.
How much force is needed to accelerate a 25kg bowling ball at 2m/s2. 
a)
50N
b)
5N
c)
12.5N
d)
100N
19.
Newton's law of motion describes the relationship of force, mass, and acceleration. Write the equation.
a)
M=F/A
b)
F=MA
c)
A= F/M
d)
All of the above
20.
Which is an unbalance force?
a)
A book sitting on a desk.
b)
A ball moving in a constant speed in the same direction. 
c)
While doing a mannequin challenge Jose suddenly falls over when a bug lands on his nose. 
d)
Every student in class is sitting perfectly still at their desks.
21.
Is it BALANCED? 
a)
Yes
b)
No
22.
What is the unit for FORCE? 
a)
N (Newtons)
b)
lbs (pounds)
c)
g (grams)
d)
m/s (meters per second)
23.
Calculate the net force of the object in the image shown.
a)
20N
b)
35N
c)
5N
d)
25N
24.

An object with a mass of 10 kg is accelerated upward at 2 m/s2. What force is required? (a)   Newtons

25.
What is the net force?
a)
5000 N right
b)
4000 N right
c)
40 N left
d)
4000 N left
26.
45 m/s2 is the... 
a)
Mass
b)
Force 
c)
Acceleration
d)
weight
27.

Which of the following is the formula for momentum?

a)

p = mv

b)

M = mv

c)

F = ma

d)

g = mc2

28.

Which of the following is the unit for momentum?

a)

kg·m/s

b)

kg·m

c)

kg·m/s2

d)

Momentum has no unit.

29.

Calculate the momentum of a 55-kg running back moving westward at 10 m/s.

a)

550 kg·m/s, west

b)

550 kg·m/s

c)

550 m/s, west

d)

550 kg, west

30.

Calculate the momentum of a 1200-kg truck moving northward at 30 m/s.

a)

36000 kg·m/s, north

b)

400 kg·m/s, north

c)

36000 kg·m/s

d)

400 kg·m/s

31.

With what velocity must a 0.48-kg softball be moving to equal the momentum of a 0.29-kg baseball moving at 23 m/s?

a)

13.9 m/s

b)

10.8 m/s

c)

16.7 m/s

d)

12.0 m/s

32.

Newtons are the correct unit for which of the following?

a)

Force

b)

Work

c)

Power

d)

Acceleration

33.

How do we calculate work?

a)

W = F * d

b)

w = f / d

34.

Which is the correct unit for work?

a)

Joules

b)

Newton

c)

meter

d)

Watts

35.
The rate at which work is done.
a)
Joules
b)
Power
c)
Watts
d)
Newtons
36.
How do you calculate power?
a)
P = W/t
b)
P = E/t
c)
P = w * t
d)
P = bbq/chicken
37.

What is the correct unit for power?

a)

Watt

b)

Joules

c)

Newtons

d)

seconds

38.

It took 500 Newtons of force to push a car four meters. How much work was done?

a)

2000 J

b)

125 J

c)

0.008 J

d)

500 J

39.
1. A book weighing 1.0 newton is lifted 2 meters.  How much work was done?
a)
2 J
b)
0.5 J
40.

What is the power of a kitchen blender if it can perform 3,750 Joules of work in 15 seconds?

a)

250 W

b)

0.004 W

c)

56,250 W

d)

25 W

41.

How much power is used if a force of 35 Newtons is used to push a box a distance of 10 meters in five seconds? (Hint: Solve for work first. This is a 2-step problem.)

a)

70 W

b)

3.5 W

c)

7 W

d)

350 J

42.
A set of pulleys is used to lift a piano weighing 1,000 newtons.  The piano lifted 3 meters in 60 seconds  How much power is used?
a)
16.67 watts
b)
50 watts
43.

What is effort (input) force?

a)

the force one exerts on a machine

b)

the force which an effort force must overcome in order to do work on an object via a simple machine.

c)

the force the machine exerts on a object

d)

the output work times the input distance

44.
If the weight of the block is 10N, how much force does one have to apply to lift it using this pulley (MA=2)?
a)
2N
b)
5N
c)
10N
d)
15N
45.

Using a lever, Joe is able to lift a 10,000 N car off of the ground with a force of 1000 N. What is the mechanical advantage of the lever (MA=Output Force/Input Force)?

a)

1

b)

10

c)

100

d)

1000

46.
if a load of a lever is 100 newtons and the force you apply is 20 newtons, what is your mechanical advantage?
a)
120 N
b)
5 N
c)
2000 N
d)
80 N
47.

The mechanical advantage of this inclined plane is...(MA=Resistance Force/Effort Force)

a)

2.4

b)

3.4

c)

4.4

48.
The law of conservation of energy states that when one form of energy is converted into another,
a)
energy is destroyed in the process
b)
no energy is destroyed in the process
c)
energy is created in the process
d)
some amount of energy cannot be accounted for
49.

Efficiency is calculated by useful energy output divided by total energy input, expressed as a percentage

a)

False

b)

True

50.

An electric motor is used to raise an object. The object's gravitational potential energy store increases by 60J when the motor is supplied with 200J of energy by an electric current. Calculate the percentage efficiency of the motor.

(a)  

51.

Calculate the efficiency of the TV.

a)

60%

b)

56%

c)

4%

d)

39%

52.

A power station needs an input of 188 J each second to operate a single 60 W lamp in a house. The Sankey diagram shows what happens to the input energy at each stage. Calculate the overall efficiency from power station input to lamp.

a)

2.6 %

b)

0.80 %

c)

2.5 %

d)

0.0080 %

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