Gravity
What pulls objects toward the Earth?
What is gravity
What is push or pull on an object called?
What is a force?
What is the force that opposes motion between two surfaces?
What is friction?
What are forces that are equal in size but opposite in direction called?
What are balanced forces?
What are forces that cause an object to accelerate called?
What are unbalanced forces?
How does gravity affect a ball thrown in the air?
It pulls the ball back down to the ground.
What unit is used measure force?
What is a Newton?
Name one type of friction.
What is static friction, sliding fraction, rolling friction (or fluid friction)
What happens to an object when balanced forces act on it?
It stays at rest or moves at a constant speed.
What happens to a soccer ball if a player kicks it?
The ball moves in the direction of the kick due to unbalanced forces.
What is the force of gravity on Earth compared to the Moon?
It is stronger on Earth.
Can a force act on an object without touching it? Give an example.
Yes, like a magnetic force.
How does roughness of surface affect friction?
Rough surfaces create more friction.
Give an example of balanced forces in everyday life.
A book resting on a table.
If a tug-of-war team pulls with different strengths, which direction will the rope move?
It will move toward the stronger team.
How does mass affect the force of gravity?
More mass means a stronger gravitational pull.
If you pull an object to the left with a force of 10 N and push it to the right with a force of 5 N, what is the net force?
What is 5N to the left?
What happens to a sliding object when friction is present?
It slows down and eventually stops.
If two people push a stationary car with equal force in opposite directions, what happens?
The car does not move.
Describe how unbalanced forces can change the speed of an object.
They can increase or decrease the speed of the object depending on the direction of the force.
Name an effect of gravity on the planets in our solar system.
It keeps them in orbit around the sun
Describe how forces affect the motion of an object.
Forces can start, stop, or change the direction of motion.
Why do ice skates glide easily on ice?
Because ice has less friction compared to other surfaces.
How do balanced forces affect the motion of a skateboarder going down a ramp?
They can keep the skateboarder moving at a constant speed if the forces are balanced.
What effect do unbalanced forces have on a car accelerating down a hill?
They cause the car to speed up as it goes downhill.