Move It!
A force is a ______.
Push or Pull
Two equal forces act in opposite directions on a resting object. The forces are ___________.
Balanced.
What force pulls a dropped pencil toward Earth?
Gravity
What charge is this:
’+’
Positive charge.
What is a buildup of charge on an object’s surface?
Static electricity.
You kick a soccer ball away from you. Is this a push or a pull?
Push.
A resting toy car starts moving when you push it. The forces are ____________.
Unbalanced.
What force slows a ball as it rolls across the floor?
Friction.
An object has equal amounts of positive and negative charge. What is its overall charge?
Neutral.
After you rub a balloon on your hair, the balloon gains negative charges. What charge does the balloon become?
Negative.
A goalkeeper catches a moving ball. What happens to the ball’s motion?
It stops.
A book rests on a table. What are the 2 forces?
Gravity and the table.
You throw a ball straight upward. Which direction does gravity pull while the ball travels up?
Down, towards Earth.
A positively charged object is brought near a negatively charged object. What will happen?
They will attract.
Two balloons are rubbed on hair and both become negatively charged. What happens when they are brought close together?
They repel/move apart.
A soccer ball is rolling toward Mia. She wants to send it back toward the player who kicked it. Name two changes to the ball’s motion that happen if she stops it with her foot and then kicks it back.
It stops moving, then starts moving in the opposite direction.
Two students pull a rope equally hard in opposite directions. Which way will the rope begin moving? Why?
It will not move because the forces are balanced.
A ball rolls across a floor and gradually stops. A student says, "The ball ran out of force." Name the force that slowed it down.
Friction
An object has eight negative charges and five positive charges in a model. What is its overall charge?
Negative.
A technician wears a grounding wrist strap while repairing electronics. Where does the excess charge go?
In the ground.
A ball is moving north. A student claims, “The ball can only change direction if it stops first.” Is the student correct? Give one action that could change the ball’s direction without stopping it first.
No. A kick or push from the side could change its direction while it is still moving.
Two students each pull a wagon with 5 newtons of force in the same direction. What is their combined pulling force?
10 newtons.
A toy car rolls farther on a smooth floor than on a rough carpet after the same push. Which surface produces more friction, and what happens to the distance the car travels when friction increases?
The rough carpet produces more friction. More friction makes the car travel a shorter distance.
Object A repels a negatively charged balloon. Object B attracts Object A and is known to be charged. What are the charges of A and B?
A is negative; B is positive.
A storm cloud has a negatively charged bottom, and the ground beneath it is positively charged. What will happen if enough charge builds up?
An electrical discharge can occur between the cloud and the ground, producing lightning.