Newton's Laws
What is a force?
A push or a pull
What kind of energy is stored energy?
Potential energy.
What type of energy does a moving object have?
Kinetic energy
Which surface creates more friction: ice or sandpaper?
Sandpaper.
What two poles does every magnet have?
North and South.
A soccer ball is kicked and then slows down. Which force causes it to slow?
Friction
Which has more gravitational potential energy: a book on the floor or on a shelf? Why?
The book on the shelf because it is higher up.
Which has more kinetic energy: a walking person or a running person?
The running person
What is friction?
A force that resists motion between two surfaces touching.
What happens when two north poles are brought together?
They repel.
Which law explains why a moving object keeps moving unless something stops it?
Newton’s First Law (law of inertia)
Why does a roller coaster have the most potential energy at the top of a hill?
Because it is at the greatest height.
Two objects have the same mass, but one is moving twice as fast. Which has more kinetic energy and why?
The faster object because speed has a greater effect on kinetic energy.
How would increasing friction affect the distance a sliding object travels?
It would travel a shorter distance
Name one object that is attracted to a magnet.
Iron (or steel).
A heavier shopping cart needs more force to move than an empty one. Which law explains this?
Newton’s Second Law.
Name two things that increase an object’s gravitational potential energy.
Height and mass.
Name two factors that affect kinetic energy.
Mass and speed
Why do car tires have treads?
To increase friction with the road.
Why do magnetic forces get weaker as magnets move farther apart?
Distance reduces the strength of the magnetic force.
Two students push the same box. One pushes harder, and the box speeds up more. What two things determine how much the box accelerates?
The amount of force and the mass of the box
Two rocks are on the same cliff. One has more mass. Which has more potential energy and why?
The rock with more mass because mass affects potential energy.
A bike doubles its speed. How much does the kinetic energy increase by?
It increases by four times
In a car why is friction sometimes helpful and sometimes harmful?
It helps with control and stopping but can slow things down or cause wear.
A stronger magnet attracts an object from farther away than a weaker one. What two factors affect magnetic force strength?
Magnetic strength and distance.