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Work, Power, And Simple Machines (I)
Test Description: Unit 8 Test Review for Physical Science
Instructions: Answer all questions to get your test result.
1) How much work is done when you push a sled across the snow with a force of 70.0 N for a displacement of 20.0 m?
A
4100 J
B
70 N
C
1400 J
D
1400 W
2) It takes a car 130 seconds to pull a trailer 5 m down the road and exerts a horizontal force of 7,000 N. At what power level is the car performing?
A
54 J
B
269 W
C
54 W
D
269 J
3) A crane can lift a 500 kg mass to height of 30 m in 2 minutes. The work done by the crane is: (*You must compute the force of the mass being lifted first)
A
10,000 J
B
30,000 J
C
150,000 J
D
75,000 J
4) How much work is done by a 500 Watt car engine in 10 minutes?
A
5,000 J
B
300, 000 W
C
300,000 J
D
3,000 J
5) What is a device that does work with only one movement and changes the size or direction of a force?
A
Compound Machine
B
Ideal Machine
C
Simple Machine
D
Appliance
6) The work output of a machine divided by the work input is the ______________ of the machine.
A
resistance
B
power
C
efficiency
D
effort
7) A machine that changes only the direction of a force has a mechanical advantage of:
A
a value greater than 1.
B
a value less than 1.
C
a value equal to 2.
D
a value equal to 1.
8) If trying to move a very heavy piece of furniture using a ramp should you choose a short ramp or a long ramp? Explain why.
A
The shorter ramp becuase it will reduce the distance and force needed to move the piano.
B
The shorter ramp because it will reduce the distance to move the piano.
C
The longer ramp because it will reduce the force needed to move the piano.
D
The longer ramp because it will increase the distance and the force needed to move the piano.
9) The mechanical advantage of a pulley system is equal to the number of:
A
moveable pulleys in the system
B
none of these
C
Sections of rope pulling up on the object.
D
fixed pulleys in the system.
10) How does using a pulley make moving heavy objects easier?
A
doubles the force required to lift the object
B
decreases the force required and changes the direction of the force needed to lift the object
C
decreases the force required to lift the object
D
changes the direction fo the force needed to lift the object
11) You are debating buying a new can opener. This particular can opener requires 2,000 J of work to begin opening the can and it does 500 J of work. How efficient is this can opener?
A
4 %
B
0.25 %
C
400 %
D
25%
12) A bottle cap is an example of what simple machine?
A
Inclined Plane
B
Screw
C
It is not an example of a simple machine
D
Wedge
13) How is a wedge like an inclined plane?
A
It is an inclined plane wrapped around a cylinder
B
It is two inclined planes put back to back
C
An inclined plane is two wedges put back to back
D
They are not related
14) Which is an example of a wheel and axle?
A
crow bar
B
shovel
C
seesaw
D
water faucet knob
15) Something that reduces the friction of moving something:
A
Lever
B
Pulley
C
Weel and Axle
D
Screw
16) Something that holds things together or is used to lift something:
A
Screw
B
Wedge
C
Pulley
D
Inclined Plane
17) Something that can split an object apart:
A
Wedge
B
Inclined Plane
C
Lever
D
Seesaw
18) A ramp:
A
Inclined Plane
B
Wedge
C
Lever
D
Wheel and axle
19) Something that uses a rope and can change the direction of a force:
A
Lever
B
Screw
C
Wheel and Axle
D
Pulley
20) Something similar to a see-saw that can lift an object:
A
Inclined Plane
B
Lever
C
Wedge
D
Pulley
*select an answer for all questions
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