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9th WORK AND ENERGY

Total questions: 59

Worksheet time: 3hrs 17mins

Name
Class
Date
1.

The energy stored in a compressed spring is..........

a)

Potential energy

b)

Kinetic energy

c)

Heat energy

d)

Electrical energy

2.

The work done on an object does not depend on the

a)

Displacement

b)

Angle between Force and Displacement

c)

Initial velocity of the object

d)

Force applied

3.

When an object falls freely towards the Earth, then its total energy

a)

decreases

b)

increases

c)

first increases then decreases

d)

remains constant

4.

Which one of the following is the commercial unit of energy?

a)

kilowatt-hour

b)

kilowatt

c)

watt-hour

d)

watt

5.

in case of negative work, angle between force and work is-

a)

0 degree

b)

45 degree

c)

90 degree

d)

180 degree

6.

Which one of the following is the unit of energy

a)

newton

b)

kilowatt

c)

dyne

d)

joule

7.
Calculate the KE of a runner that has a mass of 80 kg and is running at a velocity of 8 m/s
a)
5120 J
b)
320 J
c)
640 J
d)
2560 J
8.
____________ is the ability to cause change. 
a)
Energy 
b)
Force 
c)
Friction
d)
Motion
9.
Energy due to motion is ____________ energy. 
a)
Potential 
b)
Energy
c)
Kinetic
d)
Friction
10.
__________ is stored energy. 
a)
Potential
b)
Kinetic
c)
None of the above 
d)
All of the above 
11.
Gravitational potential energy depends on the ________ and ________ of the object. 
a)
Height and mass
b)
Friction and movement
c)
Mass and Movement
d)
Height and Friction 
12.
Energy can not be created or destroyed, only converted from one form to another.
a)
true
b)
false
13.
As a pendulum swings from its highest to lowest position, what happens to its kinetic and potential energy? 
a)
Both the potential energy and kinetic energy decrease
b)
The potential energy decreases while the kinetic energy increases 
c)
The kinetic energy decreases while the potential energy increases 
d)
Bothe the potential energy and kinetic energy increase 
14.
At which point is kinetic energy greatest? 
a)
W
b)
X
c)
Y
d)
Z
15.
When a pendulum swings, at which point is kinetic energy highest?
a)
1
b)
2
c)
3
d)
4
16.
When a pendulum swings, at which point is potential energy at its greatest?
a)
1
b)
2
c)
3
d)
4
17.
if you push a cart with a force of 60 N resulting in 120 J of work.. how far did you move the cart? 
a)
7200 m
b)
0 m
c)
2 N 
d)
2 m
18.
What is energy?
a)
the ability to do work
b)
mass and volume
19.

What is the S.I unit of work?

a)

N.m2

b)

(Kg.m2) / s2

c)

J/m

d)

J

20.

In which scenario is work = 0 J ?

a)

Pushing a stationary wall

b)

Pulling a trolley car

c)

Pushing a book across the table

d)

Dropping a set of keys from a height, h.

21.

Power depends on force and speed.

a)

True

b)

False

22.

Work is zero if the force has a component in the direction opposite of motion.

a)

True

b)

False

23.

A 3 kg plate is tossed across the room with an acceleration of 13 m/s2 in 2.5 sec. Calculate the amount of power it took to toss the plate.

a)

290.5 W

b)

1267.5 W

c)

507 W

d)

3000 W

24.

An object weighing 20 N moves horizontally toward the right a distance of 5.0 m. What is the work done on the object by the force of gravity?

a)

The work done on the object by the force of gravity is 50 J.

b)

The work done on the object by the force of gravity is zero joules.

c)

The work done on the object by the force of gravity is 4.0 J.

d)

The work done on the object by the force of gravity is 0.25 J.

e)

The work done on the object by the force of gravity is 100 J.

25.

You pick up a 3.8 kg can of paint from the ground and lift it to a height of 1.4 m. You hold the can stationary for half a minute, waiting for a friend on a ladder to take it. How much work do you do during this time (when the can of paint was stationary)?

a)

52 J

b)

30 J

c)

0 J

d)

25 J

26.

If the net work done on an object is positive, what can you conclude about the object's motion?

a)

The object is speeding up.

b)

The object is moving with a constant velocity.

c)

The object is slowing down.

d)

The object is at rest; its position is constant.

27.

You raise a bucket of water from the bottom of a well that is 12 m deep. The mass of the bucket and the water is 5.00 kg, and it takes 15 s to raise the bucket to the top of the well. How much power is required?

a)

39 W

b)

41 W

c)

43 W

d)

45 W

28.

A box is pushed by 20 N force to the right and displace for 0.1 m. What is the work done?

a)

0.005 J

b)

0.1 J

c)

1 J

d)

2 J

29.

What is the formula of work?

a)

W = F / d

b)

W = F + d

c)

W = F x d

d)

W = F - d

30.

A car has speed 5 m/s and the mass of the car 1000 kg. What is the kinetic energy of the car?

a)

12500 J

b)

25000 J

c)

5000 J

d)

2500 J

31.

A box is raised from 2 m to 5 m. This box has mass 15 kg. What is the change in potential energy from initial to final point? (

g=10 ms2g=10\ \frac{m}{s^2}  )

a)

300 J

b)

450 J

c)

750 J

d)

1000 J

32.

Which of the following variable is not affect the potential energy?

a)

height from ground

b)

gravitational acceleration

c)

mass

d)

temperature

33.

Potential energy of a feather is 2 J. The mass of the feather is 50 gram. What is the height of feather above the ground? (

g=10 ms2g=10\ \frac{m}{s^2}  )

a)

4 cm

b)

40 cm

c)

400 cm

d)

4 km

34.

Initially, the box at rest. Then after applied by a force, it moves to 10 m/s. The mass of box is 5 kg. What is the work done of force?

a)

25 J

b)

250 J

c)

500 J

d)

750 J

35.

A marble is thrown upward with initial speed 20 m/s. The mass of marble is 0.01 kg. What is the maximum height reached by marble? (

g=10 ms2g=10\ \frac{m}{s^2}  )

a)

5 m

b)

10 m

c)

15 m

d)

20 m

36.
When energy moves from one form to another it is said to be _________________
a)
Transformed
b)
Eliminated
c)
Lost.
d)
Created 
37.

Which of the following has kinetic energy?

a)

a rock poised for a fall

b)

an archer's bow that is drawn back

c)

a rolling bowling ball

d)

A spring that has been compressed

38.

What is the formula for calculating the total amount of mechanical energy?

a)

ME = KE + PE

b)

KE = ME + PE

c)

PE = mgh

d)

ME = 1/2 mv2

39.

A 78-kg skydiver has a speed of 62 m/s at an altitude of 870 m above the ground. Determine the total mechanical energy of the skydiver.

a)

816 kJ

b)

15.0 kJ

c)

666 kJ

d)

668 kJ

e)

500 kJ

40.
How much work is done in holding a 15 N sack of potatoes while waiting in line at the grocery store for 3 minutes?
a)
15 J
b)
45 J
c)
0 J
d)
5 J
41.
What is the difference between calculating power and work?
a)
Power takes into account the time it takes to complete a task
b)
Work takes into account the time it takes to complete a task
c)
Power is force/area
d)
Work is force/area
42.

An 80 N rope tension force is used to slowly pull a wagon 50 m up a hill. Calculate the work done by the rope if it pulls parallel to the hill

a)

-4000 J

b)

4000 J

43.
Which situation is work not done?
a)
lifting a 20 pound box off the floor
b)
holding a 20 pound box above the floor
c)
sliding a 20 pound box across the floor
d)
sliding a 20 pound box up an inclined plane
44.
What type of energy is in this picture?
a)
Kinetic
b)
Potential
c)
Chemical
d)
Sound
45.

A crane lifts an 8-m long steel girder weighing 2600 N up 15 m off the ground. The crane did ___ of work.

a)

0 J

b)

39000 J

c)

20800 J

d)

2600 J

46.

How does conservation of energy explain why something that is falling should speed up?

a)

It gains kinetic energy because it gains potential energy.

b)

It loses kinetic energy because no work was done on it.

c)

It gains kinetic energy because it loses potential energy.

d)

It loses kinetic energy because the Earth gains potential energy.

47.
How much work is done in holding a 15 N sack of potatoes while waiting in line at the grocery store for 3 minutes?
a)
15 J
b)
45 J
c)
0 J
d)
5 J
48.
What is the difference between calculating power and work?
a)
Power takes into account the time it takes to complete a task
b)
Work takes into account the time it takes to complete a task
c)
Power is force/area
d)
Work is force/area
49.

Bob (80 kg) uses 180 N of force to get him up the slope. The vertical distance is 2 m and the diagonal is 10 m. Calculate the work he does.

a)

1600 J

b)

160 J

c)

3600 J

d)

1800 J

50.
Is this an example of work? 
A waiter carries a tray full of meals above his head by one arm straight across the room at constant speed. 
a)
True
b)
False
51.
Which situation is work not done?
a)
lifting a 20 pound box off the floor
b)
holding a 20 pound box above the floor
c)
sliding a 20 pound box across the floor
d)
sliding a 20 pound box up an inclined plane
52.
Which situation is work not done?
a)
lifting a 20 pound box off the floor
b)
holding a 20 pound box above the floor
c)
sliding a 20 pound box across the floor
d)
sliding a 20 pound box up an inclined plane
53.
3. Calculate the PE of a 2 kg cat perched 10 meters above the ground. 
a)
20 J
b)
200 J
c)
2.04 J
d)
200 W
54.
4. In science, work is defined as this:
a)
Product of force exerted perpendicular and displacement.
b)
Product of force exerted parallel and displacement.
c)
Product of force exerted in any direction and displacement.
55.
9. Sue raises a stack of books 2 meters using a force of 20N.  Calculate work. 
a)
392 J
b)
392 W
c)
40 J
d)
40 W
56.
Mechanical energy is equal to the sum of Kinetic energy and _________ energy
a)
Thermal
b)
Potential
c)
Electrical
d)
Chemical
57.
Calculate the work needed to raise a 3 kg cat up to a height of 4 meters.
a)
12 J
b)
0 J
c)
120 J
d)
1.22 J
58.
Calculate the Kinetic Energy (KE) of a girl whose mass is 50 kg and who is moving at 4 m/s.
a)
200 J
b)
800 J
c)
400 J
d)
100 J
59.

Energy stored in river water is

a)

Potential energy

b)

Electrical energy

c)

Kinetic energy

d)

Chemical energy

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