Energy and Work

Energy and work Exercises

Contest worth points. ​ MUST BE DEVELOPED IN THE NOTEBOOK!!!!

Fill in the Blanks

If an object is falling, the gravity affects it. It is a force, thus the energy the object has can be calculated as gravitational potential energy. write the equation of it.

Multiple Select

A bag (13Kg) is carried by a girl over a hill (12m), by accident she let go the bag over the cliff at the top of the hill. Does it have Gravitational potential energy? if so, how much is it?

• 1528,8 J

• 1528,8 N

• It does not have gravitational potential energy

• 1528,8 $$\frac{kg\times m^2}{s^2}$$

Fill in the Blanks

The equation to calculate Work is:

Open Ended

Maria is pushing the wall, how much is the work applied to it?

Multiple Choice

Kinetic energy is the energy of motion, its equation is:

• $$KE\ =\ \frac{1}{2}m\times v^{ }$$

• $$KE\ =\frac{1}{2}v\ \times m^2$$

• $$KE\ =\ \frac{1}{2}m\ \times v^2$$

• $$KE\ =\ 2m\ \times v^2$$

Fill in the Blanks

Karly is running thorugh the hallway. The teacher meassures her velocity towards her direction being 20 m/s. She stops the student and asks her for her mass, Karly answers 50kg. The teacher then tells her that she was using

J as her kinetic energy and that is not the place to do it.

Diagram forces

Model a box that has two forces acting on it, 12 N to the right and 4N to the left. Also model the gravity. Remember the knowledge of direction and velocity to do so.