Kinetic energy

Multiple Choice

How much work does an elephant do while moving a circus wagon 20 meters with a pulling force of 200N?

$$w=f\times d$$  

• 4000 joules

• 10 joules

• 220 joules

• 180 joules

Multiple Choice

How much power is needed for an elevator to exert a force of 15,000N to go up 12m in 60s.

$$P=\frac{W}{t}$$                   $$W=f\times d$$  

• 180000 w

• 3000 w

• 75000 w

• 20.8 w

Multiple Choice

A dog runs briefly with a speed of 12m/s.  Suppose the dog with a mass of 32 kg runs at this speed.  What is the dog’s kinetic energy? $$KE=\frac{1}{2}mv^2$$  

• 384 joules

• 2304 joules

• 2.67 joules

• 44 joules

Fill in the Blanks

How fast will an object with a mass of 4 kg be going if it has a kinetic energy of 8 J?

$v=\sqrt[]{\frac{2\times KE}{m}}$

Multiple Choice

You go bowling with your friends. You use the 12 lbs bowling ball and throw it at a velocity 12mph. What would make the ball have more kinetic energy, if you increase the mass to 14 lbs or if you increase the velocity to 14 mph?

• increase mass

• increase velocity

Fill in the Blanks

• A crane lifts a 75kg mass a height of 8 m. Calculate the gravitational potential energy gained by the mass

• $PE=m\times g\times h$

Hotspot

In which shelf would the books have the most gravitational potential energy?

Categorize

Options (6)

• A person at the top of a diving board

TV hanging on the wall

Bowling ball rolling down the lane

A phone falling to the ground

water at the top of a waterfall

A car driving on the highway

Categorize the scenarios as either having Kinetic Energy or Potential Energy

Kinetic Energy

Potential Energy

Hotspot

Where does the rollercoaster have the most potential energy?

Multiple Choice

Where does the rollercoaster have the most Kinetic energy?

• w

• x

• y

• z