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In-class activities

1. 2. 3. 4.

January 19, 2010

energy. acceleration. distance. power. 9% 2% 1

Raising an auto on a service station rack requires work. Raising it twice as high requires 1. 2. 3. 4. 5.

the same work twice the work. twice the power. Half the work Half the power.

9%

2

3

6% 0%

1

2

3

4

0%

5

If an object has momentum, it must also have

1

2

potential energy. kinetic energy. work. All of the above.

potential energy. momentum. power. impulse.

2

3

5

31%

2%

0%

0%

4

64%

1. 2. 3. 4.

43%

1

3

If an object has kinetic energy, it must also have 55%

1. 2. 3. 4.

4

Raising an auto on a service station rack requires work. Raising a twice-asheavy auto the same vertical distance requires 1. the same work. 46% 42% 2. twice the work. 3. twice the power. 4. Half the work 13% 5. Half the power.

74%

11%

2%

2% 4

1

2

3

2% 4

1

A 1-kg iron ball and a 10-kg iron ball are dropped from rest from the top of a onestory building. When hitting the ground below, compared with the 1-kg ball, 75% the 10-kg ball has 1. less momentum and KE. 2. the same momentum and KE. 3. 10 times as much momentum and 10 times as much KE. 4. 10 times as much momentum and 100 times as much KE.

18%

When a car is braked to a stop, unless it is a hybrid, its kinetic energy is transformed to 45%

43%

1. 2. 3. 4.

stopping energy. potential energy. energy of motion. heat.

7%

2%

0% 1

2

11%

3

4

When a hybrid car brakes to a stop, much of its kinetic energy is transformed to 89%

1

2

3

4

A machine can multiply forces or 64%

1. 2. 3. 4.

1. 2. 3. 4.

heat. work. electric potential energy. gravitational potential energy. 4% 1

distances. work. energy. All of the above.

19% 6%

6%

11%

0% 2

3

4

1

2

3

4

A heavy object and a light object that are allowed to fall from the same height have equal 85%

1. 2. 3. 4.

total energies. momenta. Both of the above. None of the above. 9% 2% 1

2

4% 3

4

2