Forces

Question 1

What is a force?

Answer 1

A push or a pull that acts on an object due to the interaction with another object

Question 2

Are forces scalar or vector quantities?

Answer 2

Vector

Question 3

All forces have m____ and d____

Answer 3

magnitude and direction

Question 4

What is the unit of forces?

Answer 4

Newton, N

Question 5

What is a contact force?

Answer 5

A force that acts when the two objects are physically touching

Question 6

Give two examples of a contact force

Answer 6

• Tension
• Friction
• Air Resistance
• Normal Contact Force

Question 7

What is a non contact force?

Answer 7

A force that acts when the two objects are physically separated

Question 8

Give an example of a non contact force

Answer 8

• Gravity
• Electrostatic Force
• Magnetism

Question 9

What is meant by a Vector Quantity?

Answer 9

A quantity with magnitude and direction

Question 10

Give two examples of vector quantities

Answer 10

• Velocity
• Force
• Displacement
• Acceleration

Question 11

What is meant by a scalar quanity?

Answer 11

A quantity with only magnitude

Question 12

Give two examples of scalar quantities

Answer 12

• Speed
• Distance
• Mass
• Temperature
• Time

Question 13

What is the definition of mass?

Answer 13

The measure of how much matter is in an object

Question 14

What is mass?

Answer 14

The measure of how much matter is in an object

Question 15

What is the unit of mass?

Answer 15

Kg

Question 16

What is weight?

Answer 16

The force acting in an object due to gravity

Question 17

What is the equation for weight?

Answer 17

weight = mass x gravitational field strength

Question 18

Describe the relationship between the weight and mass of an object

Answer 18

The weight of an object is directly proportional to its mass

Question 19

What is the centre of mass of an object?

Answer 19

The point at which an object will balance because the weight on either side of the point is the same

Question 20

What is meant by resultant force?

Answer 20

A single force that has the same effect as all the original forces acting together

Question 21

What is meant by work done?

Answer 21

Energy transferred to or from an object which allows it to be moved

Question 22

What is the equation for work done?

Answer 22

Work Done = Force * Distance

Question 23

What can all forces be resolved into?

Answer 23

Two perpendicular components

Question 24

When calculating the work done against gravity, why do you use the vertical distance?

Answer 24

Because the distance must be in the line of action of the force, and weight acts vertically downwards

Question 25

What is meant by an elastic material?

Answer 25

One that will return to its original shape after being stretched, providing you haven’t exceeded its elastic limit

Question 26

What happens to objects that have been elastically deformed after forces stretching them are removed?

Answer 26

They return to their original shape

Question 27

What happens to objects that have been plastically deformed after forces stretching them are removed?

Answer 27

They don’t return to their original shape

Question 28

Can you elastically deform an object with only one force? Why/Why not?

Answer 28

No, the object would move rather than change shape

Question 29

What is the equation for the force required to stretch an elastic object

Answer 29

Force = spring constant * extension

Question 30

Independent variable in the stretching a spring practical

Answer 30

The weight on the spring

Question 31

Dependent variable in the stretching a spring practical

Answer 31

The extension produced by different weights

Question 32

Control variable in the stretching a spring practical

Answer 32

Material of the spring

Question 33

What is meant by elastic limit?

Answer 33

The greatest stress that can be applied without causing plastic deformation

Question 34

What is the equation for elastic potential energy?

Answer 34

EPE = 1/2ke^2

Question 35

What does a curve mean on a distance time graph?

Answer 35

A changing velocity

Question 36

What is meant by acceleration?

Answer 36

The change in velocity per second

Question 37

How can you find the distance travelled on a velocity time graph?

Answer 37

Calculate the area under the curve

Question 38

What is Newton’s First Law?

Answer 38

An object will remain at rest or a constant velocity unless acted on by a resultant force

Question 39

What is Newton’s second law?

Answer 39

The force acting on an object is proportional to the rate of change of momentum it causes

Question 40

What is Newton III?

Answer 40

If object A exerts a force of object B, object B exerts an equal and opposite force on object A

Question 41

Which two components make up stopping distance?

Answer 41

Thinking Distance and Braking Distance

Question 42

What can affect the thinking distance?

Answer 42

• Blood Alcohol Level • Tiredness • Speed of the Car • Drugs in the driver’s body

Question 43

What can affect the Braking Distance?

Answer 43

• Weather • Condition of the brakes • Condition of tyres • Mass of the car

Question 44

Whats the equation for momentum?

Answer 44

Momentum = mass x velocity

Question 45

What is meant by momentum?

Answer 45

It is a measure of how difficult it is to stop a moving object

Question 46

Is momentum scalar or vector?

Answer 46

Vector

Question 47

What does the conservation of momentum state?

Answer 47

In any collision the total momentum is constant in the absence of external forces

Question 48

What is meant by an inelastic collision?

Answer 48

One where the total kinetic energy reduces due to being lost by heat or sound

Question 49

What is an elastic collision?

Answer 49

One where the total kinetic energy before is the same as after

Question 50

What is the equation for moments?

Answer 50

Force x Perpendicular Distance

Question 51

What is a moment?

Answer 51

The turning effect of a force

Question 52

What are levers and gears?

Answer 52

Force multipliers