Lower Secondary: Energy and Work

Energy is the _______ to do work.

SI unit for work is ______.

Which are the different forms of energy?

• Kinetic

• Gravitational potential

• Electrical

• Height

• Thermal

State the Principle of Conservation of Energy.

Which is the formulae for Kinetic Energy?

• $\frac{1}{2}mv^2$

• $mv^2$

• $2mv^2$

• $mgh$

Given that  $KE=\frac{1}{2}mv^2$  , calculate the kinetic energy, in joule, of a 2 kg ball moving at 3 m/s. 

Ryan is 40 kg, what is the gravitational potential energy he poses when standing on top of the slide? g = 10 N/kg

( $GPE=mgh$ )

If Ryan has 800 J of gravitational potential energy at the top of the slide, suppose no energy loss to the surrounding, what is the kinetic energy he poses at the bottom of the slide? 

( $loss\ in\ GPE=gain\ in\ KE$ )

Work done by a constant force on an object is the product of the force and the _________ by the object in the direction of the force.

What is the formulae for calculating work done of a force?

• $\frac{force}{dis}$

• $force\times dis$

• $force+dis$

• $force\ -dis$