# Conservation Of Energy 1

10 Questions | Total Attempts: 854  Settings  Choose the correct answer from the alternatives given

• 1.
The illustration below shows a ball on a curved track. The ball starts with zero velocity at  the top of the track. It then rolls from the top of the track to the horizontal part at the ground Ignoring friction, its velocity just at the moment it reaches the ground is 14 m/s. What is the height, h, from the ground to the top of the track?
• A.

7m

• B.

10m

• C.

14m

• D.

20m

• 2.
The _____ states that the energy in a closed, isolated system can neither be created nor destroyed.
• A.

Law of conservation of energy

• B.

Law of conservation of mass

• C.

Law of mechanical energy

• D.

Law of thermal energy

• 3.
. A pendulum that consist of a 2kg mass swings to a maximum vertical displacement of 17cm above its rest position. At its lowest point, the kinetic energy of the mass is equal to...
• A.

0.33 J

• B.

3.33 J

• C.

33.3 J

• D.

333 J

• E.

3333 J

• 4.
A ball falls from a height, h, from a tower. Which of the following statements is true?   .
• A.

The potential energy of the ball is conserved as it falls

• B.

The kinetic energy of the ball is conserved as it falls

• C.

The differences between the potential energy and the kinetic energy is a constant as the ball falls

• D.

The sum of the kinetic and potential energies of the ball is constant

• 5.
The point at which the block has both kinetic and potential energy is .
• A.

A

• B.

B

• C.

C

• 6.
The block has the maximum amount of kinetic energy at point
• A.

A

• B.

B

• C.

C

• 7.
A 0.5kg ball is dropped from a third storey window that is 10m above the sidewalk. What is the speed of the ball just before it strikes the sidewalk?
• A.

5m/s

• B.

10m/s

• C.

14m/s

• D.

28m/s

• E.

200m/s

• 8.
. the equation that shows the conservation of mechanical energy is ________
• A.

KE before + PE before = KE after + PE after

• B.

E = KE + PE

• C.

KE before + KE after = PE before + PE after

• D.
• 9.
A pendulum is dropped from a height of 4m as shown above. The speed of the pendulum at the lowest point of the swing is most nearly...
• A.

6m/s

• B.

7m/s

• C.

8m/s

• D.

9m/s

• E.

10m/s

• 10.
A 5-kg object is dropped from a height  of 15m. What will the approximate velocity of the object be when it is 10m above the ground?
• A.

0 m/s

• B.

10 m/s

• C.

20 m/s

• D.

50 m/s

• E.

100 m/s

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