Types of Forces
What is a force?
A push or pull on an object
What direction does gravity pull objects?
Towards the center of the Earth (down)
What is friction?
A force that slows down motion
What causes a magnetic force?
A) Moving electric charges inside materials
B) Gravity pulling metals
C) Friction between objects
D) Heat energy
A) Moving electric charges inside materials
What distinguishes an applied force from other forces?
It is a force you apply by pushing or pulling directly
Which of these is NOT a type of force?
A) Gravity
B) Friction
C) Magnetism
D) Temperature
D) Temperature
The more mass an object has the ________ gravity it has.
MORE
Does friction help or stop movement?
Stops or slows movement, acts opposite of motion
What happens when you bring the north poles of two magnets close together?
They repel each other
When you push a heavy box across the floor, which forces act on it?
Applied force, friction, gravity, and normal force
What is a contact force?
A force when objects touch each other
NO. Your mass stays the same always, your weight changes because there is less gravitational force on the moon!
Which surface has less friction?
A) Carpet
B) Ice
C) Sandpaper
D) Grass
B) Ice
How do magnetic forces help in a maglev train?
By pushing the train up to reduce friction
How does the normal force change if you stand on one foot instead of two?
It increases on the foot you stand on
Which is an example of a contact force?
A) Magnet pulling metal
B) Gravity pulling an apple down
C) Pushing a door open
D) The sun shining
C) Pushing a door open
How does gravity affect a skydiver before opening the parachute?
Gravity pulls the skydiver downward, increasing speed
Which is an example of friction helping?
A) Sliding on ice
B) Floating in water
C) Riding a bike without brakes
D) A car stopping at a red light
D) A car stopping at a red light
Why does Earth act like a giant magnet?
A) Because it has a metal core with moving electric charges
B) Because of its atmosphere
C) Because of the sun’s radiation
D) Because of its gravity
A) Because it has a metal core with moving electric charges
What happens to the forces on a book resting on a tilted table?
Gravity acts straight down; normal force acts opposite
Which force is a non-contact force?
A) Friction
B) Applied force
C) Magnetism
D) Normal force
C) Magnetism
How does gravity affect the planets?
A) It pushes planets away from the sun.
B) It pulls planets toward the sun, keeping them in orbit.
C) It makes planets move in a straight line away from the sun.
D) It stops planets from moving.
B) It pulls planets toward the sun, keeping them in orbit.
The sun has more gravity because it has more mass, it keeps planets in their orbit.
What happens when friction is reduced?
(reduces = less)
Objects will not stop moving
How does the distance between two magnets affect the magnetic force between them?
The force gets weaker as the magnets move farther apart
If two people push a box from opposite sides with equal force, what happens?
The box does not move because forces are balanced