Forces and Motion

Question 1

What are the three ways force can affect a body?

SSD

Answer 1

• Changes shape: Can cause a body to stretch or compress
• Changes speed: Can cause a body to speed up or slow down
• Changes direction: Can cause a body to change direction of travel

Question 2

What is the difference between scaler and vector quantities + examples

Answer 2

• Scaler only have magnitude (size)
• Vector have magnitude and direction;
  -Force
  -Acceleration
  -Velocity
  -Momentum
  -Displacement
  -Weight

FAVMDW

Question 3

What is friction?

Answer 3

Friction is the force between two objects that oppose motion

Question 4

What’re the factors affecting stopping distance

Answer 4

• Vehicle speed
• Vehicle mass
• Road conditions
• Reaction time of driver

SMRR

Question 5

How is terminal velocity reached?

Answer 5

• As an object falls and speed up, air resistance increases
• Grows large enough to balance downwards weight force
• The weight will equal drag and the object will travel at a constant speed = no further acceleration = terminal velocity

Question 6

What does hookes law state?

Answer 6

• The extension of a spring is directly proportional to the force applied

Question 7

What is newtons third law

Answer 7

• When two objects interact they exude equal and opposite forces on each other
• Or you can js remember: Every action has an equal and opposite reaction

Question 8

What is the ability of elastic behaviour?

Answer 8

• It’s the ability of a material to return to its original shape
• After forces causing deformation have been removed

Question 9

What are the safety features for momentum

Answer 9

• Air bags
• Seatbelts
• Crumple zones

Question 9

What is momentum?

Answer 9

Momentum is a moving object or a mass in motion

Question 10

How do safety features for momentum prevent injury?

Answer 10

• Change in momentum stays the same
• But happens over a larger time frame
• This reduces the force felt to the equation force=change in momentum / time