Forces

Question 1

What is a Scalar?

Answer 1

A physical quantity described by its magnitude, its size.

Question 2

What is a vector?

Answer 2

A physical quantity described by its magnitude (size) and direction.

Question 3

Name some Scalar quantities.

Answer 3

Mass
Time
Speed
Distance

Question 4

Name some vector quantities.

Answer 4

Velocity
Force
Displacement
Acceleration

Question 5

What is a contact force?

Answer 5

A force where objects are physically touching.

Question 6

What is a non contact force?

Answer 6

A force where objects aren’t physically touching.

Question 7

Name some Contact forces.

Answer 7

Friction
Air resistance
Normal contact force

Question 8

Name some non contact forces.

Answer 8

Gravity
Magnetism

Question 9

What is mass?

Answer 9

A measure of how much matter an object has.

Question 10

What is the centre of mass?

Answer 10

The point at which all mass of an object appears to act on.

Question 11

How can the centre of mass be found?

Answer 11

It is found where the lines of symmetry meet.

Question 12

What is resultant force?

Answer 12

The overall force acting on an object.

Question 13

What is work done?

Answer 13

The energy transferred via forces.

Question 14

What is power?

Answer 14

The rate at which energy is transferred.

Question 15

What is Hooke’s law?

Answer 15

Hooke’s law states that the extension of a spring is proportional to the force applied.

Question 16

What is elastic deformation?

Answer 16

When an object is stretched or compressed and returns to its original shape.

Question 17

What is inelastic deformation?

Answer 17

When an object doesn’t return to its original shape after being stretched or compressed.

Question 18

What is the equation for velocity?

Answer 18

Displacement divided by time.

Question 19

What is acceleration?

Answer 19

The rate of change in velocity.

Question 20

Is acceleration a scalar or vector?

Answer 20

Acceleration is a vector.

Question 21

In a velocity time graph, what does the area of the shape represent?

Answer 21

displacement

Question 22

As the gradient of a velocity time graph increases, what also increases?

Answer 22

Acceleration

Question 23

How do you find the acceleration of a specific point on a velocity time graph?

Answer 23

Use a tangent and find it’s gradient.

Question 24

What is terminal velocity?

Answer 24

The maximum constant speed an object reaches while free falling.

Question 25

When does terminal velocity occur?

Answer 25

When the air resistance applied to an object is equal to the weight, resulting in a resultant force of 0N.

Question 26

What is newton’s first law?

Answer 26

If an object’s resultant force is 0 Newtons it will either remain stationary or move at a constant.

Question 27

What is newton’s second law?

Answer 27

If the resultant force of an object is greater than 0 Newtons, the object will begin to accelerate. Also the acceleration is proportional to the force acting on the object.

Question 28

What is Newton’s third law?

Answer 28

If object A exerts a force onto object B, then object B will exert an equal and opposite force onto object A.

Question 29

What does newton’s third law riddle down to?

Answer 29

Any action has its equal and opposite reaction.

Question 30

What is inertia?

Answer 30

The tendency of objects to want to remain in its existing state.

Question 31

Do all objects have inertia?

Answer 31

Yes

Question 32

What is inertial mass?

Answer 32

A measure of how difficult it is to change the velocity of an object.

Question 33

What is the equation for inertial mass?

Answer 33

resultant force divided by acceleration.

Question 34

What is the units for inertial mass?

Answer 34

Kg

Question 35

What is stopping distance?

Answer 35

How long it takes a car to stop in total after a hazard is spotted.

Question 36

What is thinking distance?

Answer 36

The distance travelled by a car from the moment a hazard is spotted until the brakes are applied.

Question 37

What is braking distance?

Answer 37

The distance travelled by a car once brakes are applied.

Question 38

What is stopping distance equal to?

Answer 38

Thinking distance + Braking distance

Question 39

What factors affect thinking distance?

Answer 39

Speed Intoxication (drugs or alcohol) Age Mental health Tiredness Distractions

Question 40

What factors affect braking distance?

Answer 40

Speed Condition of tyres and brakes The friction of the road weather conditions

Question 41

What is momentum?

Answer 41

A vector which shows how difficult it is to stop a moving object.

Question 42

What is the equation for momentum?

Answer 42

mass times velocity

Question 43

What are the units for momentum?

Answer 43

KgM/s

Question 44

What does a negative momentum value signify?

Answer 44

The direction

Question 45

What is the conservation of momentum?

Answer 45

The sum of momentum before a collision is equal to the sum of momentum after a collision, as long as there are no external factors.

Question 46

What is an elastic collision?

Answer 46

A collision where momentum and kinetic energy are conserved.

Question 47

What is an inelastic collision?

Answer 47

A collision where only momentum is conserved.

Question 48

What would a higher rate of change in momentum equal?

Answer 48

higher force experienced.

Question 49

What is the equation for force in relations to momentum?

Answer 49

change in momentum over change in time.