1. Work Output is _. a)The total work a machine does. b)The useful work a machine does.
2. The efficiency of a machine is always_. a)Less than 100% b)More than 100% c)Expressed as a Joule.
3. You can improve the efficiency of a machine by _. a)Adding luricants to the surfaces b)Making the area that the friction is acting upon smaller. c)Making the area that the friction is acting upon larger. d)both a) and b) e)Both a) and c)
Short Answer:
4. It takes 400N for a machine to pull a cart up a 24m inclined plane to a height of 10m. The force of gravity acting on the cart is 335N. Determine the efficiency of the machine to the nearest whole number.
5. Sherilynn uses a lever to lift her toy chest to a vertical height of 50cm. She exerts 700N of effort to move her end of the lever 85cm. The force of gravity acting on the tox chest is 1000 N. How much of the energy was wasted as heat?
1. Work Output is _.
a)The total work a machine does.
b)The useful work a machine does.
2. The efficiency of a machine is always_.
a)Less than 100%
b)More than 100%
c)Expressed as a Joule.
3. You can improve the efficiency of a machine by _.
a)Adding luricants to the surfaces
b)Making the area that the friction is acting upon smaller.
c)Making the area that the friction is acting upon larger.
d)both a) and b)
e)Both a) and c)
Short Answer:
4. It takes 400N for a machine to pull a cart up a 24m inclined plane to a height of 10m. The force of gravity acting on the cart is 335N. Determine the efficiency of the machine to the nearest whole number.
Answer
5. Sherilynn uses a lever to lift her toy chest to a vertical height of 50cm. She exerts 700N of effort to move her end of the lever 85cm. The force of gravity acting on the tox chest is 1000 N. How much of the energy was wasted as heat?
Answer
6. Explain why a lever is more efficient than a ramp.
Answer
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