Friction
Friction is a force that causes objects to speed up.
True or false?
FALSE!
Friction causes objects to slow down and stop!
What does repel mean?
When two of the same charge (positive/positive) or (negative/negative) push away from each other.
Motion is when an object changes position because of a force acting on it.
A push or a pull on an object that causes it to move
(pick correct answer)
against!
Mrs. Wilson and Mrs. Morgan had a toy car race using ramps.
Mrs. Wilson's ramp was smooth wood and Mrs. Morgan's ramp was covered with carpet.
They released the cars at the same time.
Who's car won the race and why?
Mrs. Wilson's car won because her ramp was smoother, so it created less friction against the toy car. The ramp covered in carpet had more friction so it slowed Mrs. Morgan's car down.
What does attract mean?
When two of the same charge go towards each other.
When does motion occur?
Motion occurs when a force acts on an object, causing it to move.
List 3 types of force we have learned about this 9 weeks:
-Friction
-Gravity
-Magnetism
Explain why roads are more slippery when they are icy?
Ice creates a lot less friction than concrete, so a car is more likely to slide around. There is less grip for the tires because there is less friction.
If a ball is rolled with the same amount of force on the following surfaces, which surface will allow the car to roll the fastest and the farthest?
-Grass
-Carpet
-Sandpaper
-Tile
The tile because it is the smoothest and has the least amount of friction
If a magnet is bigger, it will always be stronger.
True or false?
False. Size does not determine the strength of a magnet.
Name an example of a motion that might be caused by gravity.
An apple falling from a tree
(answers will vary)
An object will move if the amount of force is greater than the amount of friction.
True or false?
TRUE!
Explain the steps of the scientific investigation method.
1. Question
2. Hypothesis
3. Materials
4. Procedure
5. Data
6. Conclusion
Mrs. Wilson rolled a car on the grass. She rolled the same car on the sidewalk. The car went farther on the sidewalk. Explain why this happened?
The car went farther on the sidewalk because it is a smoother surface and creates less friction for the car.
Think about our magnet and paper clip investigation. Why did each of the magnets pick up different amounts of paper clips?
The magnets were different strengths. The stronger magnets picked up more paper clips. The weaker magnets picked up less.
What is speed?
Speed is distance per time. So:
miles/hour
meters/second
etc.
When a toy car rolls down a ramp, gravity is responsible for causing the car to move down the ramp.
True or false?
TRUE! Gravity pulls the car down the ramp.
When conducting an investigation, how many times should you repeat the procedure step?
More than once; two or three times to make sure you are getting accurate results.
If you roll a soccer ball on the grass, the ball will keep rolling forever as long as nothing gets in its way.
True or False?
FALSE. Friction from the grass will cause the ball to slow down and eventually stop unless you keep using force to roll the ball.
What will happen if you sprinkle iron filings around a magnet?
The iron filings will form a pattern that matches the magnetic field around the magnet.
What is velocity?
velocity is speed PLUS direction. So:
Mrs. Wilson's velocity was 8 m/h heading south.
When a toy car rolls down a ramp, friction is responsible for causing the car to move down the ramp.
True or false?
False. Friction acts AGAINST the motion of the car, causing it to slow down and come to a stop.
What happens to the speed of a ball after it is rolled?
The speed will decrease because of friction.