Chimics

Question 1

Change in motion

Answer 1

Set an object in motion: to kick a ball
Stop an object in motion: stop a moving ball
Speed up an object: to kick a slow moving ball
Slow down an object in motion: to slow down a fast moving ball
Make an object turn: hitting a ball with a raquet

Question 2

What is a force

Answer 2

A force is a push or a pull on an object that results from the interaction with another object

Question 3

What is a receiver

Answer 3

A receiver has the force acting on it

Question 4

What is an agent

Answer 4

An agent exerts the force

Question 5

How many object to need to interact for a force to exist

Answer 5

2 objects

Question 6

Change in shape :

Answer 6

Compress or expand an object: squeezing a sponge
Bend or deform an object:to change the shape of clay
Break an object: drop an egg on the floor

Question 7

Magnitude

Answer 7

The greater the strength of a force, the longer the vector that represents it : 25 newton

Question 8

Direction

Answer 8

Forces are always exerted in a direction
The arrowhead point in the direction of the force:
———> this is the direction

Question 9

Point of application

Answer 9

This is the point on the receiver at which the force is applied.

Question 10

Two forces are equal if their — and — are the same

Answer 10

Magnitude and direction

Question 11

Net force

Answer 11

The net force is the sum of forces acting on an object

Question 12

Contact forces

Answer 12

Contact forces only occur when two object are in physical contact with each other : the force one hand exerts shaking another hand

Question 13

Action at a distance forces

Answer 13

Action at a distance forces are interactions between objects that are not in physical contact with each other : the force a magnet exerts on an iron ball

Question 14

Gravity

Answer 14

Gravity is the force with which all objects attract each other by simply having mass

Question 15

Pressure

Answer 15

Pressure is the ratio of force exerted to the surface area over which that force is applied

Question 16

Inertia

Answer 16

Inertia is the tendency of objects to resist a change in their motion

Question 17

An object the at rest

Answer 17

An object is said to be at rest if it does not change its position with respect to its surroundings with time.

Question 18

An object in equilibrium

Answer 18

An object in equilibrium is if all the object acting on it are balanced so that the net force is zero

Question 19

Friction

Answer 19

As an object moves across a surface it causes friction. The friction force opposes the objects motion Example: A book sliding on the table, a ball rolling on the floor.

Question 20

Normal force

Answer 20

is the force that supports the weight of an object on a surface, acts in the opposite direction of gravity. Most often, we see this with objects at rest on a horizontal surface, like a book on a table or someone standing on a floor

Question 21

Tension

Answer 21

Tension force. A force that is transmitted through a string, rope, cable or wire when it is pulled tightly Example- A cable car or climbing a mountain using a rope.

Question 22

A motionless object is always — but an object in equilibrium is not necessarily —

Answer 22

In equilibrium, at rest

Question 23

The unit of mesure of force is the —

Answer 23

Newton (N)

Question 24

Weight

Answer 24

The weight of an object on Earth is equal to the pull of gravity with which the earth attracts it.

Question 25

Gravity

Answer 25

9.8 formula