Force
A _____ is a force that brings an object closer to something.
Pull
A push or pull that moves or changes an object when two objects touch
Contact force
When an interaction occurs between two or more forces, it can result in a change of _____.
Motion
What is in motion will stay in motion and what is at rest will stay at rest.
Newtons 1st Law
Forces that act together on an object without changing its motion (cancel each other out)
Balanced (equal) forces
When 2 things rub together to cause an object to slow down, what kind of force is taking place?
Friction
A force that does not need to touch an object to affect it, such as gravity
Non-contact force
What is acceleration?
A change in a object's direction or speed (can be an increase or decrease)
For every action there is an equal and opposite reaction
Newton's 3rd Law
Forces that cause an object to start or stop moving
Unbalanced (unequal) forces
A _____ is a force that moves an object away from something
Push
Pulling a wagon is an example of what kind of force?
Contact- You have to touch the wagon to make it move
Distance traveled over a period of time
Speed
A larger force is needed to move an object with a larger mass
Newtons 2nd Law
Two people of the same mass sitting on a seesaw is an example of balanced or unbalanced forces?
Balanced
What type of force is happening to a ball as it rolls down a hill?
Gravity AND Friction
Pushing open a door is an example of what kind of force?
Contact- You have to touch the door to pull it open
How does friction impact an object's motion?
Friction makes it harder for one surface to move past another. It also keeps objects from moving. It can slow an object's motion down.
A fireman turning on a hose and being knocked backwards is an example of what Newton's law?
Newtons 3rd Law
A bowling ball hitting the pins is an
________ force that causes the pins to move.
Unbalanced
A non-contact force that pulls objects towards Earth
Gravity
Using a magnet to pick up a pile of spilt paper clips can be related to what type of non-contact force?
Gravity
As a car approaches a red light, the driver pushes the brake pedal. The speed of the car drops to zero. When the light turns green, the driver pushes the gas pedal. The speed of the car climbs from zero as the car starts moving. At a corner, the driver turns the steering wheel, and the car changes direction.
When an object speeds up, slows down, or changes direction, its ____ changes.
Motion
Being pushed back in your seat when an airplane takes off is an example of what Newton's law?
Newtons 1st Law
Several people are enjoying a ride in a hot air balloon. This type of balloon rises because of the lifting force of the hot air inside it.
When the balloon is neither rising nor falling, what best describes the forces acting on it?
Balanced forces
The lifting force of the hot air is balanced by the downward pull of gravity.