Force
Friction
Simple Machines
scenarios
100
The heavier the mass, the greater the force of ______
gravity
100
A force that occurs when an object rubs against another object.
friction
100
list 3 out of the 6 simple machines
lever, screw, pulley, wheel and axle, wedge, ramp,
100
Joshua and Shanice were moving a bookshelf across the carpet in their classroom. Even though they pushed as hard as they could, the bookshelf would only move a few inches at a time. What happened as they tried to push the bookshelf?
The force of friction opposed the motion of the bookshelf.
200
What is a newton?
A newton (N) is the international unit of measure for force.
200
TRUE OR FALSE
Using snow tires on an icy road is an example of increasing friction.
TRUE
200
name the two types of pulleys
fixed and moveable
200
Alix is playing with a soccer ball at the top of a hill. Alix kicks the ball and it rolls down the hill. What happens as the ball rolls?
The force of gravity pulls the ball downhill.
300
what force is being show?
compression
300
A toy car rolling along different surfaces will experience different amounts of friction. A toy car would encounter the most friction when rolling on which surface?
A rough surface (for example: a sandy beach, over grass, over rocks)
300
what are disadvantages for using a ramp?
Longer distance to push/pull
Have to push/pull against gravity
can not move the ramp
if the object does not have wheels or push easily it would be hard.
300
Becca roller skates to the top of a hill and then starts rolling downward. What are the MAIN forces affecting Becca’s motion as she rolls down the hill?
What are friction and gravity.
400
Which of Newton's Laws states: That for every action there is an equal and oppostite reaction.
THIRD LAW
400
What two forces are acting together to keep a cup balanced on a tabl
Gravity and the force of the table holding the cup up.
400
A ___________ is a machine that is made up of two or more simple machines.
Complex Machine
400
Using a screw takes ______________ force than pounding a nail.
less
500
What is a balanced force?
What is Equal forces that act in opposite directions on an object and cancel one another out.
500
The direction of the frictional force on a moving object is
- opposite to the motion of the moving object.
- the same as the motion of the moving object.
- not going to alter the acceleration of the moving object.
- never responsible for stopping the motion of the object.
500
Explain how a lightbulb is considered a screw.
A lightbulb has grooved threads around the base of the bulb (where the metal is). A person turns the lightbulb so that it screws into the lamp.
500
Which stickman, A or B, is pushing less distance?
which stickman A or B would have to push the lever with more force?
Stickman B is pushing less distance but will have to apply a much greater force.