Forces

Question 1

What are examples of forces?

Answer 1

Weight
Friction
Up thrust
Reaction
Air Resistance

Question 2

What is Newton’s First Law?

Answer 2

An object will remain stationary or continue to move at a constant speed as long as the forces acting on it are balanced

Question 3

What is Newton’s second law?

Answer 3

If there is a resultant force on an object then it will start to change speed (accelerate / decelerate)

Question 4

What is Newton’s third law?

Answer 4

For every action there is an equal and opposite reaction

Question 5

How do you calculate the resultant force?

Answer 5

Subtract the smaller number (force) from the larger number (force)

Question 6

Force and extension are…

Answer 6

Directly proportional

Question 7

What is Hooke’s Law?

Answer 7

The extension of an elastic object is directly proportional to the force applied to it, up to a point

Question 8

What is the Hooke’s Law formula?

Answer 8

F (force) = K (spring constant) ➗ X (extension)

Question 9

I how do you calculate the extension?

Answer 9

The new length minus the original length

Question 10

What is force measured in?

Answer 10

Newtons

Question 11

What is the spring constant measured in?

Answer 11

N/m

Question 12

What is extension measured in?

Answer 12

metres

Question 13

What is a moment?

Answer 13

Turning effect of a force around a pivot.

Question 14

How do you calculate moments?

Answer 14

Force x Perpendicular Distance from the pivot

Question 15

What are moments measured in?

Answer 15

N/m

Question 16

How can an object reach equilibrium (be balanced)

Answer 16

Forces have to be the same on either side

Question 17

What are the 6 vector quantities?

Answer 17

Displacement, velocity, acceleration force weight momentum

Question 18

What are the 6 scalar quantities?

Answer 18

Temperature, mass, energy, distance, speed, density

Question 19

Is force a scalar or vector quantity?

Answer 19

Vector

Question 20

What is the relationship between unbalanced force, mass and acceleration?

Answer 20

Force = mass x acceleration
F = m x a

Question 21

What is the relationship between weight, mass and gravitational field strength?

Answer 21

Weight = mass x gravitational field strength
W = m x g

Question 22

What is the stopping distance of a vehicle made up of?

Answer 22

Thinking distance and braking distance

Question 23

What are the factors affecting vehicle stopping distance?

Answer 23

Speed, mass, road condition and reaction time

Question 24

What are the two main forces that act on a falling object?

Answer 24

Weight and Air resistance

Question 25

What happens when an object falls?

Answer 25

Reaches terminal velocity

Question 26

As a parachuter drops, what happens?

Answer 26

It accelerates, reaches terminal velocity (forces balance), air resistance = larger than gravitational force on parachute, decelerates, opens and reach new terminal velocity, becomes equal and slower

Question 27

What can effect thinking distance?

Answer 27

Speed of car, Alcohol/drugs, age and eyesight

Question 28

What can effect braking distance?

Answer 28

Speed of car, road, tyre and brake condition

Question 29

What can force change?

Answer 29

Speed, shape or direction of a body