| Force | ||
| #1 |
What is force?
|
Force is a push or a pull |
| #2 |
Name the force that slows down motion. |
The force that slows down motion is called friction. |
| #3 |
Which force is always pulling - never pushing- objects? |
The pulling force is called Gravity.
|
| #4 |
What do we call two or more forces that are act on objects and cause them to move? |
Unbalanced forces |
| #5 |
What is it called when all forces are acting an object an object and there is NO change in motion? |
Balanced Forces |
| Friction 1 | ||
| #1 | Friction is a force that is always _____________ things down.
A. pulling B. slowing C. moving |
B. Slowing |
| #2 | Name three ways you can reduce friction. |
reduce surface area add a lubricant create smoother surfaces reduce mass |
| #3 |
Where is friciton happening in this photo? |
Answers will vary. |
| #4 |
Name one way these boys reduce the friction between the sled and the surface. |
Answers will vary. |
| #5 |
|
Fluid Friction |
| Friction 2 | ||
| #1 |
Name one situation in which you want more friction. |
Answers will vary. |
| #2 | Name three ways you can increase friction. |
Add surface area make surfaces rough Add mass |
| #3 | Name the three types of friction. |
Sliding Rolling Fluid |
| #4 |
What can this poor fella do to increase friction on the surface? |
Answers will vary |
| #5 |
What type of friciton is used to help move this refrigerator? |
Rolling friciton |
| Gravity 1 | ||
| #1 | The pull of gravitiy depends on two things. What are they? |
mass and distance |
| #2 | Which object below would have the greatest gravitational pull?
feather dump truck couch |
dump truck |
| #3 |
|
Tower of Pisa. It is in Italy. |
| #4 |
DAILY DOUBLE!!!!
|
Three objects are on the moon: ping-pong ball, watermelon and a bowling ball.
They all have parachutes and are dropped from the top of the rocket.
Which object will fall to the moon the fastest? |
| #5 | Because there is no air on the moon, objects fall
A. at different speeds B. at the same speed C at slower speed |
B. at the same speed |
| Gravity 2 | ||
| #1 | Is weight and mass the same thing? |
Nope |
| #2 | Pretend you landed on Jupiter. What would change:
A. weight B. Mass C. weight and mass D. neither would change |
A. only your weight would change. |
| #3 | Name the scientist that proved objects fall at the same rate. |
Galileo |
| #4 | Name one reason why gravity is a good thing. |
Answers will vary. |
| #5 | Explain why a feather falls to the ground more slowiy than a bowling ball. |
It has more air friction. |
| Final Question | |
Explain why a hammer and a feather fall at different speeds on earth but not on the moon. |
Threre is no atmosphere on the moon so there is no air friction to slow things down. All objects fall at the same rate on the moon. |
What is the name of this building AND what country is it in?