Quiz about Work, energy and power

Question 1

What are the two necessary conditions for work to be done?

Accepted Answer

Force and Displacement

Answer

Force and Velocity

Answer

Force and Time

Question 2

What is the unit for work?

Accepted Answer

Joules

Answer

Newton

Answer

Watts

Question 3

Which of the given pictures shows that work can not done?

Accepted Answer

Option A is correct

Answer

B.

Answer

C.

Question 4

In comparing of table tennis ball and tennis ball, which ball covered a longer distance once it was placed in a slope?

Accepted Answer

tennis ball

Answer

table tennis ball

Answer

same distance

Question 5

What are the factors affect gravitational potential energy?

Accepted Answer

Mass, Acceleration due to gravity, and Height

Answer

Mass and Velocity

Answer

Mass, Acceleration due to gravity and Time

Question 6

Which of the following illustration shows elastic potential energy?

Accepted Answer

Option A is correct

Answer

B.

Answer

C.

Question 7

Which of the following statements show kinetic energy?

Accepted Answer

A river flowing down a hill

Answer

The battery of a lit flashlight

Answer

A golf ball placed at the edge of the hole

Question 8

When did an object have more kinetic energy?

Accepted Answer

When the mass of an object doubled

Answer

When the time given on an object doubled

Answer

When the mass of an object becomes half

Question 9

What are the factors that can affect the power?

Accepted Answer

Work done and time

Answer

Work done and velocity

Answer

Work done and force

Question 10

A soccer player kicks a ball with 20 Newtons of force causing it to travel 100 meters. How much work is done on the ball?

Accepted Answer

2000 J

Answer

200 J

Answer

80 J

Answer

5 J

Question 11

A worker climbs a ladder and does 8 J of work on a 2 N object. What is the distance they lift the object?

Accepted Answer

4 m

Answer

18 m

Answer

10 m

Answer

6 m

Question 12

Where is the kinetic energy of pendulum at its highest?

Accepted Answer

at the bottom of the swing

Answer

at the top of the swing

Answer

at 1/4 of the swing

Answer

at 3/4 of the swing

Question 13

At which point of this roller coaster is the energy 1/2 kinetic and 1/2 potential?

Accepted Answer

C

Answer

A

Answer

B

Answer

D

Question 14

Two workers use 100 N of force to move a sofa 2 meters in 2 seconds. How much power is required?

Accepted Answer

100 watts

Answer

400 watts

Answer

104 watts

Answer

50 watts

Question 15

How much work is being done with 200 N of force over 426 meters?

Accepted Answer

85,200 J

Answer

45,620 J

Answer

90,480 J

Answer

62,329 J

Question 16

The SI unit for power is...?

Accepted Answer

Watts

Answer

Joules

Answer

Newtons

Answer

Metres

Question 17

The faster an object moves, the ________ kinetic energy it has.

Accepted Answer

more

Answer

less

Answer

none of the above

Answer

all of the above

Question 18

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

Accepted Answer

ME = KE + PE

Answer

KE = ME + PE

Answer

PE = KE + ME

Answer

ME = 1/2 mv²

Question 19

What is the energy of position or shape that depends on weight and height, also called stored energy?

Accepted Answer

Potential energy

Answer

Energy

Answer

Kinetic energy

Answer

Sound energy

Question 20

Suppose a cart has a kinetic energy of 0.5 J. If you add enough mass to double the mass and make the cart go three times as fast, its kinetic energy is now ---.

Accepted Answer

9 J

Answer

6 J

Answer

3 J

Answer

18 J

Question 21

Two equal mass marbles are at the top of a ramp. One marble falls to the ground off the back while the other rolls down the ramp. What is true about the marbles when they reach the ground?

Accepted Answer

The two marbles are moving with the same speed.

Answer

The marble that rolled down the ramp is moving faster than the marble that fell.

Answer

The marble that fell down the back of the ramp is moving faster than the marble that rolled.

Answer

The marble that rolled down the ramp is not moving when it reaches the ground.

Question 22

A block starts at rest at point P at the top of a ramp which is height h above the ground. The block slides down one side and up the other, stopping at a point less than h above the ground.

Accepted Answer

The block did not go as high on the other side because work from friction made the mechanical energy less.

Answer

The block did not go as high on the other side because gravity pulls down.

Answer

The block did not go as high on the other side because potential energy always has to decrease.

Answer

The situation as described is impossible to happen.

Question 23

If there is no friction on this track, at which point would the coaster have the most kinetic energy?

Accepted Answer

D

Answer

A

Answer

B

Answer

C

Question 24

What effect do external forces like an applied force, friction force, or drag force have?

Accepted Answer

They convert between mechanical energy and other forms of energy to change the total mechanical energy of the system.

Answer

They have no effect on a system's mechanical energy.

Answer

They convert kinetic energy into potential energy.

Answer

They convert potential energy into kinetic energy.

Question 25

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

Accepted Answer

It gains kinetic energy because it loses potential energy.

Answer

It gains kinetic energy because it gains potential energy.

Answer

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

Answer

It loses kinetic energy because the Earth gains potential energy.

Work, energy and power

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