Up and down
The force that pulls objects towards each other.
gravity
A force that is produced when two uneven surfaces move against each other.
Friction
A notebook stays on a slanted desk.
Static friction
What causes friction to occur between two objects?
uneven surfaces
Forces can be...
Gravity and friction
Two factors that affect gravity.
Mass and distance
What is the effect of friction on the movement of an object.
It hinders the movement of an object or prevents it from moving at all.
Zumba in a pool.
Fluid Friction
Friction affects the movement by...
resisting motion
Friction can be...
static, sliding, rolling, and fluid
If the object is closer, what happens to the gravity?
What is the direction of the friction if you pushed the box to the left?
To the right
A student writing on a whiteboard using a marker.
Sliding Friction
Why does the heavenly bodies move around the Sun?
Because the gravity of the Sun is greater than the other heavenly bodies.
Gravity causes...
tides, orbiting planets, and things that stay on the ground
What will happen to the planets if there is no gravity?
They will float off into outer space.
Friction depends on...
how uneven the surfaces are.
Using an eraser on a paper.
Sliding friction
If the mass is greater, what happens to the gravity?
It increases.
Friction can be decreased using...
lubricants and ball bearings
These are caused by the gravitational pull of the Moon and Sun.
Tides
Friction can be increased using...
rubber, leather, and spikes
Writing using a ballpen.
Rolling Friction
Other term for fluid friction.
Air resistance or drag
quick movement and machines to work efficiently