Types of Force
What kind of force pulls objects toward Earth?
Gravity
What is motion?
a change in an objects position
What two poles does every magnet have?
North and South
What surface has more friction: ice or carpet?
carpet
If you push a toy car harder, what will happen to its speed?
speeds up
What force happens when two surfaces rub against each other?
Friction
What two things do you need to know to determine speed?
distance and time
What happens when two like magnetic poles face each other?
Repel
Why do we use oil in machines with moving parts?
reduce friction
What could cause a rolling ball to stop on its own?
friction or gravity
What type of force causes a magnet to attract certain metals?
magnetic
What happens when a greater force is applied to an object?
faster or further
What happens when opposite magnetic poles face each other?
Attract
Name one way to increase friction on a smooth surface.
texture or weight
What happens when forces on an object are balanced?
stays still
How does friction affect a moving object on a rough surface?
slows or stops
What do you call how fast something is moving?
speed
What does gravity do to objects dropped from a height?
pulls toward the earth
How does friction help us walk or drive?
traction and prevents slipping
If you push two objects with the same force, what will happen to the lighter one?
further and faster
What is the difference between balanced and unbalanced forces?
Balanced forces cause no change in motion; unbalanced forces cause a change.
What happens to an object’s motion when the force is removed?
slows down and stops
Why do objects fall at the same rate on Earth?
Gravity acts equally
What would happen if there were no friction at all?
Never stop moving
In an experiment, what must stay the same to test how force affects motion?
everything else