test on power and motion

Question 1

why is there a difference between the weight of an object when in water and in the air

Answer 1

buoyancy force.

Question 2

what is the mechanical advantage of a wedge that is 4cm long and 2 cm wide

Answer 2

2

Question 3

a machine with 75% efficiency does 3300J of work Using the machine, how much work did you do

Answer 3

4400J

Question 4

what is the rate at which work is down called

Answer 4

Power

Question 5

If you divide the mass of an object by volume, what will you know about the object

Answer 5

Density

Question 6

what is the upward force that acts on planes wings

Answer 6

lift

Question 7

the amount of work that a machine is outputting is called:

Answer 7

output work

Question 8

what is it called when the speed of a moving fluid increases and the pressure of the fluid decreases

Answer 8

Bernoulli’s principle

Question 9

the amount of work done on an object is found by multiplying what two things together

Answer 9

force and distance

Question 10

True or false? you have a lower mechanical advantage while you are going downhill in a car rather than going uphill

Answer 10

False

Question 11

what is the amount of work you put into an object called

Answer 11

input force

Question 12

what is the mechanical advantage when you have a 12m length incline and a 10mheight incline

Answer 12

1.2

Question 13

True or false: pressure is the amount of forcebeing applied to the surface area of an object

Answer 13

true

Question 14

what is an example of a second class lever

Answer 14

Wheelbarrow