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A job is done slowly, and an identical job is done quickly. Both jobs require the same amount of _______, but different amounts of _______. Pick the two words which fill in the blanks in their respective order.
Word Bank: energy, work, power, force
Math Practice
Work = Force*distance
Power = work/time = (Force*distance)/time
Question 13
13.
How much work is done on a 10 N block that is lifted 5 meters off the ground by a pulley?
Question 14
14.
You did 170 J of work lifting a 140 N backpack. How high did you lift the backpack?
Question 15
15.
A crane does 62,500 J of work to life a boulder a distance of 25.0 m. How much did the boulder weigh?
Question 16
16.
A motor does 5,000 J of work in 20 seconds. What is the power of the motor?
Question 17
17.
A machine that uses 200 W of power moves an object a distance of 15 m in 25s. Find the work done by the machine.
Question 18
18.
A woman runs a kilometer using a force of 210N and a power output of 500W. How long in seconds (s) does it take this woman to complete 1000 m?
Question 19
19.
A mechanic used a hydraulic lift to raise a 12,054 N car 1.89 m above the floor of a garage. It took 4.75 s to raise the car. What was the power output of the lift?
Question 20
20.
How much work is done using a 500-watt microwave oven for 5 minutes?
Work is a form of energy.
True
False
A Watt is the standard metric unit of work.
True
False
Work is a time-based quantity; it is dependent upon how fast a force displaces an object.
True
False
Superman applies a force on a truck to prevent it from moving down a hill. This is an example of work being done.
True
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
An upward force is applied by a chain to a roller coaster car to carry it up the hill of the first drop of the Shockwave ride. This is an example of work being done.
True
False
If person A and person B do the same job but person B does it faster, then person A does more work but person B has more power.
True
False
Rusty Nales uses a hammer to exert an applied force upon a stubborn nail to drive it into the wall.
Positive Work
Negative Work
No Work
The force of friction acts upon a baseball player as he slides into third base.
Positive Work
Negative Work
No Work
Which of the following statements is the most true about Kinetic Energy?
Kinetic energy is the form of mechanical energy which depends upon the position of an object.
If an object is at rest, then it does not have any kinetic energy.
If an object is on the ground, then it does not have any kinetic energy.
The kinetic energy of an object is dependent upon the weight and the speed of an object.
Which of the following statements is the most true about Potential Energy?
Moving objects cannot have potential energy.
Potential energy is the energy stored in an object due to its position.
Both gravitational and elastic potential energy are dependent upon the mass of an object.
If work is done on an object by a non-conservative force, then the object will either gain or lose potential energy.