Vocabulary
Forces
Changes in Motion
Motion
100

What is the act or process of being moved, changing position over time?

Motion

100
Which force pulls you down a playground slide?
Gravity
100

A rolling ball will slow down until it finally stops. What force slows down and stops the ball?

What is friction.

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 causes it to roll down the hill?

The force of his kick and the force of gravity cause the ball to go downhill.

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

A car is pulled across a flat desk using one washer as the force. You add two wooden blocks to the car, but still pull it with the two washers (same force). How does the speed of the car change?

It slows down (more force/inertia)

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.
300

What is the measure of the distance an object travels in a given amount of time

speed

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

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 or increase the height of the ramp

400

This is a force between two surfaces rubbing against each other. There is more of this on rougher surfaces and less on smoother surfaces.

What is friction.

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?
A rough surface (for example: a sandy beach, over grass, over rocks)
400

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 and/or it had a lot of mass/inertia

500

What is the resistance to a change in motion (in other words: an object at rest stays at rest and an object in motion stays in motion unless acted on by an outside force)

Inertia

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/inertia.

500

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.

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