WorksheetsUnit 5: Energy Exam Review
Total questions: 16
Worksheet time: 18mins
A block of mass M is connected to spring on a frictionless surface. When the block is moved to the left so that the spring is compressed, the potential energy is PE. Another block with a mass of 3M is attached to the same spring and compressed the same mount. What is the potential energy stored for the block of 3M?
1/3 PE
PE
3 PE
9 PE
The table shown has the information about the daily use of some typical appliances. Which appliance uses the most energy?
Cell Phone Charger
Desk Lamp
Mini Fridge
Television
A person carries a backpack that has a total weight of 800 N. How much work is done when she climbs up a 9 m flight of stairs in 10 s?
7200 J
720 J
60 J
50 J
A physics student is conducting an experiment where a cart is going down a ramp. After several trials, the student calculates that the kinetic energy at the bottom of the ramp is LESS THAN the potential energy at the top of the ramp. Which of the following best explains the difference in energies?
The car gained a small amount of mass while it moved down the ramp.
The student accidently accelerated the car at the top of the ramp.
The measured height of the ramp was actually less than the actual height.
The student didn't account for the effect friction would have on the cart as it moves down the ramp.
Annie and her friend need to make a ramp to help move a new couch into a home. They must take the couch up 3 meters of stairs. Which of the answers below correctly compares the Force and Work required using each ramp?
The 15 m ramp will require a smaller force and require more Work
The 5 m ramp will require a larger force and require more Work
Both ramps will require the same force and the same Work
The 5 m will require a larger force and require the same Work
Which graph shows an object that conserved its Total Mechanical Energy?
There are 4 identical carts each with a mass of 0.5 kg. Blocks of a mass 1.0 kg are randomly placed on the carts. Each of the 4 carts goes up a ramp where every box is 1.0 meters high. Which cart has the least potential energy at the top of the ramp?
A block slides across a flat, horizontal surface to the right. Each dot represents the blocks position after 1 second of time. Which of the following diagrams represents the block losing kinetic energy.
A 2 kg block is placed at the top of a ramp with a height of H. The block’s velocity while sliding down the incline is shown in the graph. How could a student use the graph to determine the total mechanical energy of the block at the bottom of the ramp? Friction is negligible.
Use mgy0 with m=2 kg and y0 equal to the area between the horizontal axis and the curve
Use ½ mvf2 with m=2 kg and vf equal to the final velocity of the object that can be found from the graph.
Use Fd with F equal to the normal force exerted on the block and d equal to the area between the horizontal axis and the curve.
The answer cannot be determined without knowing the initial height of the object above the ground.
A 10 kg block is pushed up a 3.0 m high incline as shown. The block is pushed a distance of 15.0 m up the incline. What is the gravitational energy of the block at the top of the incline? Use g=10 m/s2
0 J
30 J
150 J
300 J
A bowling ball is initially at rest before it is dropped to ground from a height of H. Which two energy bar charts show the mechanical energy of the bowling ball right before it falls and when it is halfway to the ground?
A 2.0-kg block slides down a ramp. It initially starts at 0.8 m above the ground. To ensure the mots accurate results, a slippery substance is added to the ramp to eliminate the frictional force. The velocity of the block at the bottom is measured to be 3.5 m/s. Which of the following claims is correct about the substance? (NOTE: PE=KE)
The substance reduced all the frictional force because all the gravitational potential energy of the Earth-block system at the top of the incline was converted into the kinetic energy at the bottom of the incline.
The substance did not reduce all the frictional force because some of the gravitational potential energy of the Earth-block system at the top of the incline was converted into nonmechanical energy.
The effectiveness of the experimental substance cannot be determined because the speed of the block at the bottom of the inline, as measured by the motion detector, indicates that the block has more energy at this location than the Earth-block system had at the top of the incline.
The effectiveness of the experimental substance cannot be determined without knowing the magnitude of the frictional force between the block and the incline before and after the experimental substance was applied to the incline.
A cart starts from rest at the top of at the first hill and glides down without friction or air resistance. The vertical heights of the first, second and third hills are 90m, 60m and 30m, respectively. Neglect friction and air resistance.
Compare the kinetic energy of the cart at the top of the third hill to its kinetic energy at the top of the second hill. Justify your comparison.
A cart starts from rest at the top of at the first hill and glides down without friction or air resistance. The vertical heights of the first, second and third hills are 90m, 60m and 30m, respectively. Neglect friction and air resistance.
When will the cart be moving the slowest (other than at the top of the first hill)? Justify your answer.
A cart starts from rest at the top of at the first hill and glides down without friction or air resistance. The vertical heights of the first, second and third hills are 90m, 60m and 30m, respectively. Neglect friction and air resistance.
What is the maximum height of the third hill that the cart would successfully make it over? Justify your answer.
A cart starts from rest at the top of at the first hill and glides down without friction or air resistance. The vertical heights of the first, second and third hills are 90m, 60m and 30m, respectively. Neglect friction and air resistance.
What will the speed of the roller coaster be at the top of the new hill you described in the previous question? Justify your answer.
