Objects move even without a contact and act at a distance are called ______ ________. They include gravity, magnet and electricity.

(a)  

A force that pulls objects toward Earth. If you throw any object upward, it will go down. You cannot see gravity, you can only see its effects. It pulls all objects toward the ground.

(a)  

Water flows from a faucet because it is pulled down by gravity.

What kind of force is this?

(a)  

Fruits from a tree fall to the ground. All these happen because of gravity.

What kind of force is this?

(a)  

It is the attractive or repulsive force that is exerted between the poles of a magnet and electrically charged moving particles.

(a)  

A magnet pulls objects like iron nails, paper clips, pins, and other metals. These objects are called (a)   .

Objects that are not affected by the pull of magnets are called (a)  

A magnet has two ends called (a)   . One pole is called the north pole and the other is called south pole.

__________ ________ is the invisible force around a magnet.

(a)  

The north pole of one magnet (a)   the south pole of another magnet.

To attract means to pull an object toward you.

The north pole of one magnet (a)   the north pole of another magnet.

To repel means to push an object away from you.

_______ ________ is an electric charge between objects that are rubbed.

(a)  

When you rub a plastic comb on your hair, it becomes charged and attracts bits of paper.

What kind of force is this?

(a)  

Why do objects fall to the ground?

(a)  

How do you separate metal waste from nonmetallic trash?

(a)  

Why does water flow?

(a)  

Give several uses of static electricity.

(a)  

(a)   is a push or a pull that acts on an object.

(a)   is any influence that causes an object to undergo a change in speed, a change in direction, or a change in shape. In other words, it can cause an object with mass to change its velocity (accelerate or decelerate).

A force that causes an object to speed up is called (a)   .

A force that causes an object to slow down is called (a)   .

A force that changes the way a rotating object spins around its axis is called (a)   .

These are forces that need to be in direct contact with the object in order to apply force on it.

(a)  

It is a force that is transferred from a person or an object to another. If a man is pushing his chair across a room, he is using this force.

(a)  

It is a force exerted on an object when it is in contact with another object. When a ball is resting on a table, the table is exerting a normal upward force on the ball to support its weight.

(a)  

It is a force that occurs when an object moves or tries to move across a surface and opposes the objects movement. The amount of friction that is generated depends on how strongly the two are being pushed together and the nature of the surfaces. Example: the force that acts between the tires

(a)  

It is a force that acts on objects as they travel through the air. This force will oppose motion, but only factors in when objects travel at high speeds or have a large surface area.

For example, air resistance is smaller on a notebook falling from the desk than a kite falling from a tree.

(a)  

It is a force that passes through strings, cables, ropes, or wires when they are being pulled in opposite directions. The tension force is directed along the length of the wire and pulls equally on objects at opposite ends of the string, cable, rope, or wire.

(a)  

A (a)   is the basic machine used to measure force.

It is a tool that measures weights at their maximum load and remains at that level until reset, it can be used as a basic accelerometer.

(a)  

Whenever you describe something that is moving, you are comparing it with something that is assumed to be stationary or not moving. The background or object that is used for comparison a (a)   .

(a)   is the length of the path between two points.

We use (a)   to compare and measure the speed at which things move.

(a)   describes how fast an object moves.

(a)   defines the direction of the movement of the body or the object.

(a)   is the speed and the direction of a motion.

Any change in speed or velocity is called (a)   . An object accelerates when its speed is increasing, when its speed is decreasing, and/or when its direction is changing.

(a)   refers on how strong a force is.

(a)   are the points to where the object goes.

The force which act perpendicular to the surface of the object in contact with.

(a)  

The force exerted on a field of attraction or repulsion.

(a)  

The force of attraction between two objects.

(a)  

Equal in magnitude but opposite in direction.

(a)  

Not equal in magnitude but opposite in direction.

(a)  

The sum of all forces acting on an object on the object is called (a)   .