Force
Which has more friction, rubber, ice, or plexiglass?
rubber
At dinner, Hans passed the salt shaker to his sister Jessica by sliding it across the wooden table. The salt shaker gradually slowed down and stopped after moving 12 centimeters.
Why did the salt shaker stop moving?
The table exerts a force that is opposite to the salt shaker's motion.
The amount of matter in an object is called its...
mass
You push a chair across the floor. It gradually slows down and stops. Why did the chair stop moving?
friction from the floor
What is a projectile?
any object thrown into space upon which the only acting force is gravity.
What is required to change the velocity of an object?
force
What are the 5 ways an object can move?
(DOUBLE POINTS)
Start, Stop, Speed Up, Slow Down, or Change Direction
A push or pull that can cause motion
force
You are playing pool. You hit the white ball and it hits a solid blue ball that is still. What happens to both balls after the collision?
The white ball will stop and the blue ball will start moving.
Sandra pushed a wooden block and it slid across the floor. The wooden block gradually slowed down and stopped after moving 10 meters.
The floor exerted a force that is opposite to the direction of the block’s motion.
To stop an object, the force must come from:
the opposite direction of the object's motion
It takes more force to slow down your bicycle by 5 mph than to speed it up 5 mph. True or False
False
The force that slows down motion between touching objects.
friction
A pod hits a space station. The space station is much more massive than the pod. The pod experiences a much stronger force than the station. True/False
False
A car travels 25 meters west in 5 seconds. What is the velocity?
(DOUBLE POINTS)
5 m/s West
To speed up an object, the direction of force should be:
in the same direction of the object's motion
Speed with direction
Velocity
when 2 objects hit each other
collision
A pod hits a space station. The space station is much more massive than the pod. The pod experiences a much greater change in velocity. True/False
True
You travel for three hours at a speed of 30 km/hr. What is the distance?
90 km
To start an object moving, the force must come from:
any direction
An object with less mass collides into an object with more mass. Which object will have the great change in velocity?
less mass
To apply a force
Exert
There is a collision between a bug and a car. The bug experiences a greater change in velocity because...
it has a much smaller mass
Jessica jogs on a path that is 25 kilometers long to get to a park that is south of the jogging park. If it takes Jessica 2.5 hours, what is her velocity?
(Double Points)
10 km/hr South