Simple Machines
Which simple machine is like a ramp made up of a slanting surface connecting a higher level to a lower level?
inclined plane
What does force mean?
Force is any push or pull on an object.
What is gravity?
Gravity is a non-contact force that pulls objects toward each other.
Which of the following is a true statement?
Friction causes moving objects to slow down.
Friction causes moving objects to go faster.
Friction causes moving objects to slow down.
What is the scientific definition of work?
Work is what happens when a force moves an object over a distance.
Which simple machine is a stiff bar that rests on a support and lifts up one side when you press down on the opposite side?
lever
Fill in the blank.
Which of the following is an example of a non-contact force?
pedaling a bike
a magnet pulling a paperclip
A magnet pulling a paperclip is an example of a non-contact force.
What is magnetism?
Magnetism is a non-contact force that pulls objects containing a kind of metal called iron.
Which of the following surfaces produce the least amount of friction?
a. a grassy soccer field
b. smooth ceramic tile
c. rocky gravel road
Smooth ceramic tile produce the least amount of friction.
If the same amount of force is applied to each box below, which box will move the greatest distance? Why?
7 kg box
30 kg box
300 kg box
The 7 kg box will move the greatest distance because it is the lightest and easiest to move.
Which simple machine is made up of two slanted sides that end in a sharp edge?
wedge
What does motion mean?
Motion is the change in position of an object.
When a baseball player throws a ball at the batter, the ball goes forward and it starts to move toward the ground. What force pulls the ball to the ground?
Gravity pulls the ball (and everything else) toward the ground.
Which of the follow gives an example of fiction being helpful?
When you are sledding and you want to stop, you drag your foot on the ground to create friction.
When you are pushing a heavy shopping cart on a gravel path.
Friction can help you slow down or stop when you are sledding. You drag your foot on the ground to create friction and the sled slows down or stops.
Which simple machine would be used to move a flag up a pole?
wedge
pulley
wheel and axle
screw
A pulley would be used to move a flag up a pole.
Which simple machine is made up of an inclined planes wrapped around a center post?
screw
The Eagles and the Elephants are playing a game of "tug-of-war". How can the Eagles win?
The Eagles and the Elephants both pull with the same amount of force.
The Eagles pull with a greater amount of force.
The Elephants pull with a greater amount of force.
The Eagles will win by pulling with a greater amount of force than the Elephants.
Fill in the blank.
Gravity makes riding a bike uphill ___________.
easier
harder
Gravity makes riding a bike uphill harder.
Fill in the blank
Friction is a ___________________ force.
contact
non-contact
Friction is a contact force.
You are driving on a long trip. First your car is going 35 mph. When you get on the highway you go 65 mph. Then you slow down to 10 mph. Which best describes your speed and why?
fast variable
slow constant
variable best describes your speed because if the speed of the car changes depending on where you are driving.
Which simple machine has a grooved wheel that is hooked to an axle with a rope that can pull up cargo like a sail on a boat?
pulley
If a stoplight is in front of a car and then it is behind the car, the ___________ of the stoplight has changed.
relative motion
relative position
If a stoplight is in front of a car and then it is behind the car, the relative position of the stoplight has changed.
Fill in the blank.
______________ makes it easier to move when when you are riding a bike down a hill.
gravity
magnetism
Gravity makes it easier to move when when you are riding a bike down a hill.
What is friction?
Friction is the contact force that goes against the motion of an object.
Which of the following is an example of work?
solving a math problem
holding a baby
kicking a soccer ball
leaning against a wall
Kicking a soccer ball is an example of work.