Show:
Vocabulary
Forces
Changes in Motion
Motion
Mixed
100
What is an increase in motion?
Acceleration
100

Which type of force do you have if an object is at rest?

balanced force
100

Magnets have a negative and positive pole. What happens if you try to touch the positive ends of two magnets together?

The positive poles will repel each other.

100
Alix is playing with a soccer ball at the top of a hill. Alix kicks the ball and it rolls down the hill. What happens as the ball rolls?
The force of gravity pulls the ball downhill.
100
Joshua and Shanice were moving a bookshelf across the carpet in their classroom. Even though they pushed as hard as they could, the bookshelf would only move a few inches at a time. What happened as they tried to push the bookshelf?
The force of friction opposed the motion of the bookshelf.
200
Mike lifted a heavy box. What force did he have to overcome to move the box upward?
Gravity
200
The force that works against movement.
Friction
200
Explain why a parachute makes a person falling from a great height fall more slowly?
The parachute causes air resistance, which slows the fall.
200
Sandley started pushing a bookcase across the room.Then, he removed the books and continued pushing with the same force and direction. How does removing the books affect the motion of the bookcase?
The mass is decreased, making the bookcase move faster.
200
A rolling ball will slow down until it finally stops. What force slows down and stops the ball?
What is friction.
300
This pulls objects to its center of the Earth. It keeps you grounded.
Gravity
300
The type of force which results in movement?
An unbalanced force.
300
Explain why a person standing on the Moon can jump higher than a person standing on Earth.
The Moon's gravitational pull is less than Earth's.
300
Charlene kicked the winning goal in her last soccer game. What force acted between Charlene's foot and the ball to cause the ball to move?
Push
300
Some students apply force to a toy car on a ramp to push it down. The students measure how fast the car rolls down the ramp. If students want to increase the speed of the car down the ramp, what should they do?
Increase the force applied to the car.
400
What is a type of friction which slows objects moving through water?
Water resistance
400
Ms. Starling's class and Ms. Howard's class are playing tug-of-war. After several minutes, the students notice that the rope has not moved at all. What is one possible cause of this?
The two classes have created a balanced force on the rope.
400

A toy car rolling along different surfaces will experience different amounts of friction. A toy car would encounter the most friction when rolling on which surface?  What surface will have the most friction?

a.  carpet      b.  sidewalk.     c.  sand

C. sand

400
Rodrigo and Marcus are moving a dresser. They are arguing about which direction to move it. Rodrigo is pushing the dresser with a force of 5 newtons towards Marcus. Marcus is pushing the dresser towards Rodrigo with a force of 10 newtons. What happens to the dresser?
The dresser moves towards Rodrigo.
400

While on a camping trip, Nadely and Abigail are traveling in a boat on a river. On their trip, the river's current carries them down the river at a speed of 5 meters per second (m/s). They don't need to row because the current is carrying them in the direction they need to go. If no other forces are acting on the boat, describe the motion of the boat as it travels downstream?  a. the boat speeds up     b.  the boat slows down     c.  The boat has the same speed

It stays the same.

500
This is a force between two surfaces rubbing against each other. It works against the motion of an object.
What is friction.
500
What two forces are acting together to keep a cup balanced on a table?
Gravity and the force of the table holding the cup up.
500
A car and a truck travel at the same speed on a road in the same direction. Both vehicles slow down with the same stopping force. Why does the truck need more distance the the car to stop?
The truck has more mass.
500
Which type of force moves an object toward the source of the force?
Pull
500
Xiomara roller skates to the top of a hill and then starts rolling downward. What are the MAIN forces affecting Xiomara’s motion as she rolls down the hill?
What are friction and gravity.