Homework Practice

Printable assignment

Simple Machines: Make Work Easier

Section A: Simple Machines

Question 1mcq

A seesaw is an example of which simple machine?

A.Wheel only

B.Lever

C.Pulley

D.Inclined plane

Question 2mcq

A ramp is an example of which simple machine?

A.Inclined plane

B.Lever only

C.Spring balance

D.Pulley

Question 3mcq

A pulley mainly helps in which way?

A.Removing load mass

B.Stopping work

C.Destroying energy

D.Changing direction of applied force

Question 4mcq

How is mechanical advantage defined?

A.Speed divided by distance

B.Work divided by mass

C.Load divided by effort

D.Effort divided by time

Question 5mcq

If load is

100\,N

and effort is

25\,N

, MA is?

A.125

B.4

C.0.25

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.No work is done

D.Energy is created

Section B: Machine Inquiry and Energy Models

Question 7mcq

What can a pulley activity demonstrate?

A.Sound reflection

B.Atomic number

C.Photosynthesis

D.Mechanical advantage or change in force direction

Question 8mcq

Which option correctly completes this statement: To test effect of ramp length, the load should be?

A.Changed randomly

B.Made unknown

C.Kept same

D.Removed

Question 9mcq

A simple machine cannot create energy from nothing. Which statement best explains this?

A.Machines make energy from nothing

B.Work output depends on work input and energy losses

C.Friction is impossible in machines

D.The load has no weight

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 infinite

B.It is always 10

C.It is always zero

D.It is less than 1

Question 12mcq

A useful energy model of a roller coaster mainly shows which energy change as the car moves up and down?

A.Sound changing into vacuum

B.Mixtures separating by colour

C.Conversion between potential and kinetic energy

D.Atoms changing into cells