WorksheetsWork, Energy, and Simple Machines
Total questions: 20
Worksheet time: 3hrs 48mins
TRUE or FALSE
Work and Energy have the same unit.
TRUE
FALSE
TRUE or FALSE
Energy is the capacity to do work.
TRUE
FALSE
TRUE or FALSE
Work is a time-based quantity; it is dependent upon how fast a force displaces an object
TRUE
FALSE
TRUE or FALSE
An upward force is applied to a bucket as it is carried 20 m across the yard. This is an example of work being done.
TRUE
FALSE
TRUE or FALSE
A force acts upon an object to push the object along a surface at a constant speed. This is an example of work being done.
TRUE
FALSE
True or false? Kinetic energy is the energy of motion.
True
False
True or false? The higher an object, the more potential energy it has.
True
False
Which of the following statements is/are correct?
1. Work-energy theorem states that work done by a force acting on a body is equal to the change in the kinetic energy of the body.
2. Work-energy theorem states that work done by a force acting on a body is equal to the product in the kinetic energy of the body.
1 only
2 only
Both 1 and 2
Neither 1 and 2
Which of the following is an example of work?
A student types numerous essays for class.
A car drives along the road at a constant speed
A weightlifter lifts a heavy barbell above his head
A man sits in a chair.
Renatta Gass is out with her friends. Misfortune occurs and Renatta and her friends find themselves getting a workout. They apply a cumulative force of 2030N to push the car 341m to the nearest fuel station. Determine the work done on the car.
Hans Full is pulling on a rope to drag his backpack to school across the ice. He pulls upwards and rightwards with a force of 32.9 Newtons at an angle of 35 degrees above the horizontal to drag his backpack a horizontal distance of 108 meters to the right. Determine the work (in Joules) done upon the backpack.
A new conveyor system at the local packaging plan will utilize a motor-powered mechanical arm to exert an average force of 890 N to push large crates a distance of 12 meters in 22 seconds. Determine the power output required of such a motor.
A 78-kg skydiver has a speed of 62 m/s at an altitude of 870 m above the ground. Determine the kinetic energy possessed by the skydiver.
Suzie Lavtaski (m=62 kg) is skiing at Bluebird Mountain. She is moving at 20 m/s across the crest of a ski hill located 34 m above ground level at the end of the run. Determine Suzie's potential energy relative to the height of the ground at the end of the run.
A 1300kg rocket has a net propulsion force of 300N. Over a short period of time, the rocket speeds up uniformly from an initial velocity of 36m/s to a final velocity of 50m/s. Assume that the mass of the rocket remains constant even though it is burning fuel and that the net force is along the direction of travel. What is the net work done on the rocket in kJ?
A 4 kg toy car moves at a speed of 5 m/s. A child applies 3 N of force on the car. What is the final velocity of the car? (Hint: Calculate first the kinetic energy.)
Calculate the work needed to bring a 950-kg car to run 180m/sfrom a speed of 90.0 m/s in a distance of 120 m (a fairly typical distance for a non-panic stop).
Using energy considerations and assuming negligible air resistance, show that a rock thrown from a bridge 20.0 m above water with an initial speed of 15.0 m/s strikes the water with a speed of 24.8 m/s independent of the direction thrown. Hint: Use the Equation of Conservation of Energy
A 20kg ball, with a KE of 12.35J, rolling along a flat surface starts up a hill. If the ball reaches a height of 0.63m, what was its initial speed?
A 30 kg ball was tossed up with a potential energy of 196J. How high does it go?
