Forces

Question 1

What’s a scaler quantity?

Answer 1

Only magnitude

Question 2

What’s a vector quantity?

Answer 2

Magnitude and direction

Question 3

What are Contact forces?

Answer 3

The objects are physically touching

Question 4

What are noncontact forces?

Answer 4

The objects are physically separated

Question 5

What are some examples of contact forces?

Answer 5

Friction
Air resistance
Tension
Normal contact force

Question 6

What are some examples of noncontact forces?

Answer 6

Gravitational force
Electrostatic force
Magnetic force

Question 7

What is one example of a vector quantity?

Answer 7

Force

Question 8

What is one example of a scaler quantity?

Answer 8

Speed

Question 9

What does the weight of an object depend on?

Answer 9

The gravitational field strength at the point where the object is

Question 10

What is the weight of an object directionally proportional with ?

Answer 10

Mass of an object

Question 11

What is weight measured using?

Answer 11

Newton meter

Question 12

When a force causes an object to Move through a distance what is happening?

Answer 12

Work is done on the object

Question 13

What does 1 joule equal ?

Answer 13

1 newton metre

Question 14

What happens if work is done against the frictional forces acting on an object?

Answer 14

Temperature of the object rises

Question 15

The extension of an elastic object is directly proportional to what?

Answer 15

The force applied

Question 16

What is displacement?

Answer 16

The distance an object moves in a straight line from the start point to the finish point and the direction of the straight line

Question 17

What is the typical value of speed someone walks at?

Answer 17

1.5m/s

Question 18

What is a typical day of speed someone runs at?

Answer 18

3m/s

Question 19

What is the typical value speed someone cycles at?

Answer 19

6m/s

Question 20

What is the typical value of the speed of sound ?

Answer 20

330m/s

Question 21

What is velocity?

Answer 21

Speed in a given direction

Question 22

How can the speed of an object be calculated on a distance time graph?

Answer 22

Working out the gradient

Question 23

How can acceleration of an object be calculated on a distance time graph?

Answer 23

Drawing a tangent and measuring the gradient of the distance time graph at that time

Question 24

What is a balanced force ?

Answer 24

When the two forces acting on it are equal so stays stationary or moves at a constant speed

Question 25

What is an unbalanced force ?

Answer 25

When two forces acting on an object are of different sizes so the object accelerates

Question 26

What is inertia?

Answer 26

The tendency of objects to continue in a state of rest

Question 27

What is Newton’s second law?

Answer 27

The acceleration of an object is proportional to the resultant force acting on the object and inversely proportional to the mass of the object

Question 28

What is inertial mass ?

Answer 28

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

Question 29

What is Newton’s third law?

Answer 29

Whenever two objects interact the forces they exerting each other are equal and opposite

Question 30

What is the stopping distance of a vehicle?

Answer 30

The sum of the distance the vehicle travels during the drivers reaction time (thinking distance) and the distance it travels under the breaking force

Question 31

What is the typical values of reaction time?

Answer 31

0.2 to 0.9s

Question 32

What can a drivers reaction time be affected by?

Answer 32

Tiredness, drugs and alcohol

Question 33

What factors can affect breaking distance?

Answer 33

Adverse road, weather conditions, and poor condition of the vehicle

Question 34

If Greater the speed of a vehicle how much breaking force is needed to stop the vehicle?

Answer 34

Greater breaking force

Question 35

What is momentum in a closed system?

Answer 35

The total momentum before an event is equal to the total momentum after the event