1. An axe is a compound machine that consists of a wedge and a(n)
Group of answer choices
a) pulley
b)inclined plane
c) lever
d) screw
2. What is another way of writing 1 joule?
Group of answer choices
a) 1 N•m2
b) 1 N/m
c) 1 N•m
d) 1 N/m2
3. Assume that a friend hands you a 15-newton box to hold for her. If you hold the box without moving it at a height of 1.5 meters above the ground, how much work do you do?
Group of answer choices
a) 22.5 Joules
b) 0 Joules
c) 10 Joules
d) 15 Joules
4. Which of the following is an example of a third-class lever?
Group of answer choices
a) wheelbarrow
b) seesaw
c) hockey stick
d) crowbar
5. Which equation is used to calculate power?
Group of answer choices
a) force X distance
b) mass X acceleration
c) work/time
d) work/distance
6. Which weight lifter described below does the most work?
Group of answer choices
a) Tad lifts 185 N a distance of 2.2 m.
b) Ted lifts 190 N a distance of 2.1 m.
c) Tom lifts 195 N a distance of 2.0 m.
d) Tim lifts 180 N a distance of 2.3 m.
7. What term describes the ratio of input work that becomes output work?
Group of answer choices
a) work
b) efficiency
c) simple machine
d) power
8. Which of the following statements describes doing work?
Group of answer choices
a) Pushing against a stationary wall.
b) Applying a force of at least 1 newton to an object.
c) Moving an object over a distance of at least 1 meter.
d) Moving an object in the same direction that you apply force.
9. Which of the following is NOT a way in which machines help us do work?
Group of answer choices
a) Change the direction of a force
b) Increasing the amount of force applied
c) Increase the distance over which a force is applied
d) Changes the amount of work that is needed to accomplish a task
10. Which of these is a way in which a machine can make work easier to do?
Group of answer choices
a) It reduces the amount of input force needed to do the work.
b) It reduces both the input force and the input distance.
c) It reduces the output distance.
d) It reduces the total amount of work that needs to be done.
Va multumesc mult, va rog sa raspundeti la toate raspunsurile. :)
