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Q 1/36
Score 0
In order to do the greatest amount of work, how should the direction of the force applied to an object compare to the direction you want it to move?
60
same direction
at an angle
perpendicular
opposite direction
Q 2/36
Score 0
If 40 J of energy is required to lift an object up 0.5 meters, what is the mass of the object?
60
8.16 kg
80 kg
392 kg
4.08 kg
36 questions
Q.
In order to do the greatest amount of work, how should the direction of the force applied to an object compare to the direction you want it to move?
1
60 sec
Q.
If 40 J of energy is required to lift an object up 0.5 meters, what is the mass of the object?
2
60 sec
Q.
Work is done in all of the following situations except
3
60 sec
Q.
You do 200 J of work against gravity when lifting your backpack up a flight of stairs that is 4 m tall. What is the weight of your backpack in newtons
4
60 sec
Q.
An object weighing 40 N is dropped from the top of a building and falls for 20 meters. How much work does the Earth do on the object
5
60 sec
Q.
A car exerts a breaking force of 5,000 N to get it to stop and the brakes do 100,000 J of work to get the car to come to a stop. How many meters did the car travel while the brakes were being applied?
6
60 sec
Q.
Jose lifts a 50 kg barbell from the floor to a height of 1.5 meters in 2 seconds. The amount of power he generates is about _________Watts
7
60 sec
Q.
Sonya performs 98 J of work against gravity while lifting a 10 kg barbell. How high does she lift the barbell?
8
60 sec
Q.
An electrical device uses 9,000 J of energy in 25 seconds. How much power must be supplied to the device?
9
60 sec
Q.
If 100 Watts of power are used up in 10 seconds, what is the work done?
10
60 sec
Q.
A machine’s mechanical advantage is used to multiply the ______________, NOT the _____________.
11
60 sec
Q.
If the input arm on a lever is 50 cm long and the output arm is 25 cm long, what is the mechanical advantage of the lever?
12
60 sec
Q.
A lever has an input force of 5 N and an output force of 15 N. What is the mechanical advantage of the lever?
13
60 sec
Q.
The mechanical advantage of a ramp is 10 and the length of the ramp is 20 m. What is the height of the ramp?
14
60 sec
Q.
What is the most common reason for a decrease in a machine’s efficiency?
15
60 sec
Q.
If the efficiency of a machine is 60% and work output is 300 Joules, what is the work input?
16
60 sec
Q.
If an engine is 30% efficient and 1,200 Joules of energy are put into the system, how much output energy is available?
17
60 sec
Q.
A lightbulb uses 100 Joules of energy but only uses 10 Joules to light a room. What is the efficiency of the light bulb?
18
60 sec
Q.
If a machine has 100 Joules of input work but only 60 Joules of output work, where did the other 40 Joules of energy go?
19
60 sec
Q.
How much work is needed to run a 75 Watt light bulb for 25 seconds?
20
60 sec
Q.
What is the gravitational potential energy of a 60 kg crate that is 3 m above the ground?
21
60 sec
Q.
If a bowling ball has a mass of 5 kg and a speed of 2.5 m/s, what is its kinetic energy?
22
60 sec
Q.
An object has a kinetic energy of 1,000 J and a mass of 25 kg. What is the speed of the object?
23
60 sec
Q.
Energy in food or fuel
24
60 sec
Q.
Energy flowing through wires
25
60 sec
Q.
Energy of an object in motion
26
60 sec
Q.
Energy of the sun
27
60 sec
Q.
Energy lost due to friction
28
60 sec
Q.
Energy due to height
29
60 sec
Q.
Energy in a rubber band
30
60 sec
Q.
Energy of your voice
31
60 sec
Q.
Energy of push or pull
32
60 sec
Q.
Energy at center of atom
33
60 sec
Q.
Energy of moving parts, such as in a machine
34
60 sec
Q.
You want to lift a 2,000 N rock. The maximum force you can exert is 500 N. State the mechanical advantage of the lever.
35
60 sec
Q.
You want to lift a 2,000 N rock. The maximum force you can exert is 500 N. If the input arm is 1.0 meters, what is the length of the output arm?
