Force

Question 1

Define force

Answer 1

Force is not a thing, but it acts on the object, and it has effects or to accelerate
- force can be represented by arrows

Question 2

Effects of force on an object

Answer 2

The object may:

• Change its direction
• Deforms (changes its size, shape)
• Chane an object’s speed

Question 3

What is “contact force” and examples

Answer 3

The force that is made by two or more objects touching

Examples:

• Friction
• When you stop your motion completely by crashing into the door

Question 4

What is “non-contact” force

Answer 4

The force that can be made without the contact of 2 or more objects

Examples:

• Gravity
• Magnetism
• Electrostatic forces

Question 5

What is the beautiful formula that links Force, Mass, and Acceleration?

Answer 5

Force = Mass x Acceleration

* F = ma *

Question 6

What’s harder to push, a soccer ball or a car?

Answer 6

Soccer ball because it has less matter (less mass) than the car, therefore easier to push

Question 7

When does the 0 resultant force happen?

Answer 7

When opposition forces are balanced
-> no resultant force -> no acceleration
———————–
=> “moving at a constant speed” or “stay at rest”

Question 8

Another word for unbalance force

Answer 8

resultant force :0