Category 1
A tug-of-war rope doesn’t move during the game. Why does this happen?
The rope does not move because the teams are pulling with equal strength/force so the forces are balanced.
Which surface has more friction: ice or carpet?
Carpet.
What force always pulls objects toward the center of Earth?
Gravity.
A soccer ball is kicked and begins rolling. What type of force caused the ball to move?
An unbalanced force.
A baseball player hits a pop-up ball. The ball soars high into the air but eventually falls. Why?
Because of gravity.
What is motion?
a change in an objects position or location
Cindy is trying to push a box full of toys. Why is the box not moving?
The force is still balanced and Cindy is not using a strong enough force to move the box.
Two teams are playing kickball. Tommy kicks the ball where it rolls far into the outfield. Before anyone can get it, the ball stops. What made it stop?
Friction.
True or false:
Rolling a ball across an area with high friction will allow it to speed up. Explain why.
False because friction works against the movement of an object and can cause it to slow down.
A book is sitting on a table without moving. Describe the balanced forces acting on it.
The force of gravity is pulling down and the force from the table is pushing upward.
Why do car tires have grooves (tread) instead of being smooth?
Smooth tires would not help with grip while driving. The grooves add friction between the tires and the road to help stop a vehicle when braking.
Two dogs are tugging on a toy. The dog on the left is pulling with 25N and the dog on the right is pulling with 21N. What could one of the dogs do to make the forces balanced?
The dog on the right could increase its Newtons by 4.
Two kids push a box in opposite directions. One pushes left with 20 N and the other pushes right with 30 N. Which way will the box move? Explain why.
The box will move to the right because the kid pushing right is using more force.
An astronaut slides an object inside the space station, and it keeps floating without stopping. Why is friction different in space compared to Earth?
There is no friction in space because space has very little air or matter for objects to rub against.
An elevator starts moving up quickly, and you feel heavier for a moment. Why does this happen?
The unbalanced force of gravity is working to pull you down.