Energy And Simple Machines Question Preview (ID: 1300)
Energy And Simple Machines.
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The kinetic energy of an object increases as its _____ increases
a) specific heat
b) potential energy
c) velocity
d) height
A slanted surface used to raise an object is a(n)
a) inclined plane
b) screw
c) effort ramp
d) efficiency board
A bar that is free to pivot about a fixed point is a
a) fulcrum
b) wedge
c) lever
d) ramp
The work output of a machine compared to the work input is the _____ of the machine.
a) effort
b) power
c) resistance
d) efficiency
The unit of power is the
a) joule
b) MA
c) watt
d) second
Which of the following CANNOT be done by a simple machine?
a) change the direction of a force
b) decrease the amount of work done
c) decrease the time it takes to do work
d) transfer energy from one location to another
How much work is done on an object that is moved 10 m with a force of 2 N?
a) 50 J
b) 5 J
c) 20 J
d) 2 J
An inclined plane wrapped around a cylindrical post is a
a) wedge
b) screw
c) block and tackle
d) lever
An arrangement of pulleys designed to reduce the effort force is called a
a) simple pulley
b) fixed pulley
c) moveable pulley
d) block and tackle
Potential energy because of height above Earth’s surface is called _____ potential energy.
a) kinetic
b) chemical
c) mechanical
d) gravitational
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