Simple Machines
What instrument measures force in newtons?
A) Thermometer
B) Ruler
C) Stopwatch
D) Newton meter
D) Newton meter
An elevator is an example of a roller.
A) True
B) False
B) False
What do inclined planes help us do?
A) Move objects to a higher or lower place with less force
B) Increase the weight of an object
C) Change electrical energy to motion
D) Measure the force used
A) Move objects to a higher or lower place with less force
Which everyday tools are levers?
A) Scissors and crowbar
B) Pulley and ramp
C) Wheel and axle
D) Paint roller and conveyor
A) Scissors and crowbar
Which is a real-life example of a pulley system?
A) Elevator
B) Seesaw
C) Skateboard
D) Door wedge
A) Elevator
The rope and wheel used to pull up a bucket from a well is a:
A) Lever
B) Inclined plane
C) Pulley
D) Screw
C) Pulley
Which is a real-life example of rollers?
A) Scissors
B) Lever
C) Conveyor belt
D) Wedge
C) Conveyor belt
Compared to a steep incline, a gentle incline usually:
A) Requires more force but less distance
B) Requires less force but more distance
C) Requires the same force and the same distance
D) Cannot move heavy loads
B) Requires less force but more distance
In a lever, the fulcrum is:
A) The force you apply
B) The object being moved
C) The point where the lever turns
D) The length of the lever
C) The point where the lever turns
A single fixed pulley (one pulley) mainly:
A) Saves force and distance
B) Is not force-saving
C) Doubles the force you apply
D) Halves the distance you must pull
B) Is not force-saving
A ramp used to move boxes into a truck is a:
A) Lever
B) Pulley
C) Inclined plane
D) Roller
C) Inclined plane
How do rollers help move objects?
A) They increase friction so objects don’t slip
B) They reduce friction so less force is needed
C) They change potential energy into kinetic energy
D) They balance the load
B) They reduce friction so less force is needed
To reduce the force when using an inclined plane, you could:
A) Make the plane steeper
B) Shorten the plane
C) Increase the roughness of the surface
D) Add rollers or reduce friction with oil
D) Add rollers or reduce friction with oil
In a lever, the effort is:
A) The point where the lever turns
B) The force applied to the lever
C) The distance between the fulcrum and the load
D) The weight of the lever
B) The force applied to the lever
Which setup would require the least effort to lift the same load?
A) No pulley
B) One fixed pulley
C) Two pulleys with two rope sections
D) One pulley with a rough rope
C) Two pulleys with two rope sections
What is a simple machine?
A) A device with many moving parts that uses electricity
B) A tool with few or no moving parts that changes the direction or amount of force
C) A machine that makes objects move faster
D) A device that only measures force
B) A tool with few or no movings parts that makes work easier
To move a load with less force using rollers, you could also:
A) Use a rougher surface
B) Add oil or use a smoother surface
C) Increase the load’s mass
D) Remove the rollers
B) Add oil or use a smoother surface
Labeling inclines: Which statement is correct?
A) A steep incline needs less effort than a gentle one
B) A gentle incline supports the weight better and needs less effort
C) Steep and gentle inclines need the same effort
D) Inclines only change direction, not force
B) A gentle incline supports the weight better and needs less effort
In a lever, the load is:
A) The stick you push on
B) The object or weight that needs to be moved or lifted
C) The point where the lever balances
D) The direction of motion
B) The object or weight that needs to be moved or lifted
How do multiple pulleys make lifting easier?
A) They increase the load’s mass
B) They create more friction in the rope
C) They shorten the distance the load moves
D) They add more sections of rope to support the weight
D) They add more sections of rope to support the weight
Simple machines make work easier mainly by:
A) Increasing the weight of the load
B) Reducing distance
C) Changing the direction of a force or the amount of force needed
D) Storing energy as heat
C) Changing the direction of a force or the amount of force needed
In an investigation with rollers, besides changing the number of rollers (independent variable), what else could reduce the force needed?
A) Tilting the table upward
B) Using a smoother surface or adding oil
C) Using a heavier load
D) Shortening the distance
B) Using a smoother surface or adding oil
Two ramps reach the same height. Ramp A is gentle and long; Ramp B is steep and short. Which needs less effort to push a box up?
A) Ramp A (gentle and long)
B) Ramp B (steep and short)
C) Both need the same effort
D) Neither would work
A) Ramp A (gentle and long)
How can a lever reduce the force needed to lift a load?
A) Place the fulcrum farther from both effort and load
B) Remove the fulcrum
C) Shorten the lever on the effort side
D) Apply the effort farther from the fulcrum than the load
D) Apply the effort farther from the fulcrum than the load
A student uses two pulleys and lifts a 100N load by pulling 2 m of rope. Compared to one pulley, the effort force is:
A) Less
B) The same
C) Greater
D) Zero
A) Less