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Simple Machines: Make Work Easier

Section A: Simple Machines

Question 1mcq
A seesaw is an example of which simple machine?
A.Lever
B.Wheel only
C.Pulley
D.Inclined plane
Question 2mcq
A ramp is an example of which simple machine?
A.Inclined plane
B.Spring balance
C.Lever only
D.Pulley
Question 3mcq
A pulley mainly helps in which way?
A.Stopping work
B.Removing load mass
C.Destroying energy
D.Changing direction of applied force
Question 4mcq
How is mechanical advantage defined?
A.Speed divided by distance
B.Effort divided by time
C.Load divided by effort
D.Work divided by mass
Question 5mcq
If load is 100 N100\,N and effort is 25 N25\,N, MA is?
A.4
B.0.25
C.125
D.75
Question 6mcq
What does a mechanical advantage greater than 1 mean?
A.Load is greater than effort
B.Effort is greater than load always
C.Energy is created
D.No work is done

Section B: Machine Inquiry and Energy Models

Question 7mcq
What can a pulley activity demonstrate?
A.Mechanical advantage or change in force direction
B.Sound reflection
C.Atomic number
D.Photosynthesis
Question 8mcq
Which option correctly completes this statement: To test effect of ramp length, the load should be?
A.Removed
B.Made unknown
C.Changed randomly
D.Kept same
Question 9mcq
A simple machine cannot create energy from nothing. Which statement best explains this?
A.The load has no weight
B.Friction is impossible in machines
C.Machines make energy from nothing
D.Work output depends on work input and energy losses
Question 10mcq
Why does an inclined plane usually reduce the effort needed to raise a load?
A.It increases the distance over which the force is applied
B.It reduces the mass of the load to zero
C.It increases the load automatically
D.It removes the effect of gravity
Question 11mcq
If the effort applied to a simple machine is greater than the load lifted, what can be said about its mechanical advantage?
A.It is always zero
B.It is less than 1
C.It is infinite
D.It is always 10
Question 12mcq
A useful energy model of a roller coaster mainly shows which energy change as the car moves up and down?
A.Atoms changing into cells
B.Sound changing into vacuum
C.Conversion between potential and kinetic energy
D.Mixtures separating by colour