Mass, motion, speed
What is mass?
The amount of matter in an object.
What is net force?
The total force acting on an object.
What is friction?
A force that slows motion between surfaces.
When a cloud forms near the ground, what type of cloud is it?
Fog
What is motion?
When something is moving or a change in position.
Does an object with more mass need more or less force to move?
More force.
What is the net force when forces are balanced? Is there motion?
Net force is zero and motion does not change.
Does friction increase or decrease motion and speed?
Decreases
If the temperature is 80°F and the air pressure is low, is it likely that thunderstorms will form?
Yes, warm temperatures and low air pressure can lead to thunderstorms.
What kind of energy does a moving object have?
Kinetic energy
How does mass affect how fast an object moves? Does it need more or less force?
More mass = move slower and needs more force
Two equal forces push towards each other. What is the net force?
Zero
Which creates more friction: grass or ice?
Grass
Tides are the movement of ocean water caused by what?
The moon.
Stored energy. Ex: A ball at the top of a hill.
If you push two objects with the same force but different mass, which one will move more: the one with more mass or the one with less mass?
The one with less mass.
What happens when forces on an object are unbalanced?
The object's motion changes.
Concrete sidewalk, grass, carpet, sandpaper, dirt
During photosynthesis, what do plants produce?
Oxygen and sugar
How are force and motion related?
A force can stop, start, speed up, slow down or change direction of motion.
What does speed measure?
How fast something moves.
Two students push on it from opposite sides with equal force while it is moving.
What is the net force on the cart, and what will happen to the cart's motion?
The net force is zero because the forces are equal and opposite, so they are balanced.
Since the cart is already moving at a steady speed and the forces are balanced, it will keep moving at the same speed in the same direction.
A student pushes a book across a desk and then across a rug using the same amount of force each time. On which surface will the book slow down faster?
The book will slow down faster on the carpet because it has more friction. The rough surface creates more friction, which pushes against the motion and makes the book stop sooner.
Put the planets in order from the Sun outward.
Mercury, Venus, _______, ________, ________, ________, ________, and ________.
Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune
If an object changes direction but not speed, has its motion changed?
Yes.