Physics Chapter 6: Work and Energy

What is work?

• when force is applied to an object for a certain amount of distance

• when force is applied to an object

• when force is applied to an object for a certain amount of time and distance

• when force is applied to an object for a certain amount of time

A child in a tree house uses a rope attached to a basket to lift a dog upwards with a force of 54 N to a distance of 3.6 m into the house. How much work does the child do?

• 15 J

• 0.06666666667 J

• 194.4 J

• 97.2 J

A ball is pushed 156 m. If the person pushing the ball did 3800 J of work, how much force was applied?

• 24.63 N

• 24.36 N

• 592800 N

• 0.04 N

A worker that pushed a box in a warehouse is said to have done 24000 J of work. If the worker applied a force of 1250 N, how far did the worker push this box?

• 1.92 m

• 19.2 m

• 30000000 m

• 0.052 m

If a rather strong dog pulls on a stack of books that have a mass of 0.2 kg, 0.7 kg and 1.1 kg respectively with an acceleration of 1.2 m/s2 , how much work was done if the dog pulled the stack for a distance of 4 meters?

• 8.16 J

• 96 J

• 69 J

• 9.6 J

You pull on your luggage at the airport a distance of 12.45 m across a the room with a 12 N force at an angle of 37 degrees above the horizontal. What is the work done on the bag?

• 43.68 J

• 191.32 J

• 119.32 J

• 1.21 J

What is kinetic energy in words?

• energy in motion

• energy at a stand still

• stored energy

• storage

What is potential energy in words?

• motion

• stored energy

• energy in the environment

• stored movement

What is the gravitational potential energy of a diver that is 5 meters above the ground and has a mass of 86 kg?

• 2414 J

• 168.56

• 4214 J

What is the height of a cliff, if a diver jumped into a lake with a mass of 96 kg and had 3000 J of potential energy at the top of the cliff?

• 3.18 m

• .31 m

• 11020.4 m

• 306.25 m