Vocab
A force between objects. On Earth, it pulls things down.
Gravity
An object in motion stays in motion, an object at rest stays at rest unless ____________________.
acted on by an outside force
This formula is used to calculate force.
F= m x a
This law states “for every action, there is an equal and opposite…”
Reaction
These laws help explain a lot about how things move.
Newton's Laws of Motion
The force that resists motion between two surfaces.
Friction
A soccer ball on the field won't move unless this happens.
Being kicked (force applied).
Force is measured in _________. Mass is measured in _______.
Newtons and kg or Kilograms.
When you jump off a canoe, the canoe does this.
Moves backward (opposite direction).
They help keep passengers secure. keeping them from flying out of a car.
The amount of matter found in an object.
Matter
A person driving a car, wearing no seat belt, suddenly crashes and flies out of the car. Why does this happen?
Their body is still moving at that speed.
A 2 kg object accelerates at 3 m/s². What is the force?
6 N
A balloon flies when air rushes out. Which force pushes the balloon forward?
The reaction force of air pushing backward or down.
A baseball pitcher throws a fastball. Which Newton’s Law best explains why the ball accelerates?
Second Law (F = ma).
A measure of the heaviness of an object affected by gravity.
Weight
An astronaut in space pushes a wrench. What happens to the wrench?
It keeps on moving until another force acts on it.
The hevier the object, the more ________ you need to add.
Force
When a ball bounces on the floor. the ball pushes down on the floor and ...
The floor pushes back on the ball causing it to bounce up.
Which law explains why a bird can fly off the ground.
Newton's Third Law.
A force that acts on an object moving in a circular path directed towards the center.
Centripetal Force.
Which has more inertia: a bowling ball or a baseball? Why?
The bowling ball, because it has more mass.
A rocket produces 20,000 N of force on a 1,000 kg spacecraft. What is its acceleration?
20 m/s²
How does Newton’s 3rd Law explain why rockets can move in space without air?
The gases push out (action) and the rocket is pushed forward (reaction).
A rocket keeps accelerating as it goes up into the atmosphere. Why?
More force is being applied.