Work, Kenatic energy, Power

What is defined as a force acting on a subject to move from one position to another?

• work

• energy

• Speed

• power

The SI Unit for Kenatic Energy is

• Joule

• Newton

• Calorie

• Watt

The SI Unit for Power is

• Joule

• Newton

• Calorie

• Watt

What is defined as energy of motion and it is equal to one-half of the particle’s mass and the square of its speed (1/2 .m.v²)?

• Kenatic energy

• energy

• Speed

• power

What is the concept that express the relation between work done and the time needed in doing it ?

• work

• energy

• Speed

• power

What is needed to calculate work? choose 2 options

• force

• distance

• time

• mass

This weight lifter raised 100 kg to a height of approximately 2 m. How much work he did? g=9.8 m/s², F=m.g

• 1960 J

• 1029 Watts

• 2,377 J

• 4,009 Watts

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?

• 200 J

• 80 J

• 5 J

• 2000 J

A student needs 10 Newtons of force to lift a box to the top of a 2 meter shelf. How much work do they do?

• 12 J

• 8 J

• 20 J

• 5 J

If a 75 kg (m=75 kg) trainee does pull-ups took 0.8 s (t=0.8 s) to raise the body 0.6 m (distance), How much power did he apply? g=9.8 m/s2, F=m.g, W=F.distance, Power= W/t

• 551 Watts

• 281 Watts

• 317 kJ

• 313 J