Forces
What force pulls objects down towards the Earth?
Gravity
What is an object's resistance to changing its motion called?
Inertia
If you push an empty shopping cart and a full shopping cart with the same amount of force, which one will go faster?
The empty one
Every action has an equal and opposite _________
reaction
Why is it important to wear seatbelts?
Inertia if you get in a crash your body wants to keep moving
A water bottle sitting on a desk is an example of a __________ force.
balanced
An object will stay in motion unless acted on by a ___________ force
unbalanced
The heavier an object is, the more inertia it has, true or false?
True
What is another name for action & reaction?
Force pairs
If you are on a skateboard and push against a wall, what would happen?
The wall will apply an equal and opposite force pushing your body backwards
What is a force?
A push or pull
Why do you lurch forward when a car suddenly stops?
Inertia! Your body is in motion and when the car stops your body wants to continue that motion.
Name 2 of the 3 ways an object can show acceleration?
Speed increase
Speed decrease
Change of direction
Describe how a basketball bouncing demonstrates the third law of motion.
ball exerts force onto the ground and the ground exerts an equal and opposite force on the ball sending it upwards
Why do athletes wear cleats?
To increase friction to prevent them from slipping
What force acts on an airplane's wings (helping it to fly)
Lift
If you roll a ball in a large area (nothing in its way) why does it eventually stop?
Friction
What is velocity?
The speed and direction an object is moving
What are the force pairs (action & reaction) used to walk forward?
Your feet push into the ground and back sending a force down and back. The ground returns that force pushing you forward
If you threw a wrench in space (with no air resistance or friction) what would happen to it?
it would keep moving indefinitely in the same speed and direction