4. Physical Principles

Energy — Quiz

Test your understanding of energy with 5 practice questions.

Practice Questions

Question 1

A 10 kg object is moving at 12 m/s. A resistive force of 20 N is applied, causing the object to come to rest after a certain distance. What distance does the object travel before stopping?

Question 2

A 5 kg object is pushed horizontally with a constant force of 30 N across a surface with a frictional force of 10 N. If the object is pushed for 8 meters, what is the net work done on the object?

Question 3

An object is dropped from a height of 50 meters. Assuming no air resistance, what is the object's speed just before it hits the ground? (Take $g = 9.8 \; m/s^2$)

Question 4

A motor does 5000 J of work in lifting a 20 kg object vertically. What height is the object lifted to? (Take $g = 9.8 \; m/s^2$)

Question 5

A 3 kg object is moving at 4 m/s. A force is applied in the direction of motion, increasing its velocity to 10 m/s over a distance of 12 meters. What is the magnitude of the applied force (assuming no friction)?