P5 Forces

Question 1

Define displacement

Answer 1

Overall distance travelled in a certain direction

Question 2

Define vector

Answer 2

Have both size and direction
Can be negative

Question 3

Give examples of scalar quantities

Answer 3

Distance
Speed
Time
Mass

Question 4

Define scalar

Answer 4

Has size but no direction
Can’t be negative

Question 5

Give examples of vector quantities

Answer 5

Velocity
Acceleration
Force
Weight
Displacement
Momentum

Question 6

Define acceleration

Answer 6

A change in an objects velocity

Question 7

What is the upwards force acting on a vehicle on land?

Answer 7

Normal contact

Question 8

What is the upwards force acting on a vehicle on water?

Answer 8

Upthrust

Question 9

What is the upwards force acting on a vehicle in air?

Answer 9

Lift

Question 10

What happens when the gravitational field strength is strong?

Answer 10

The weight is larger

Question 11

What happens when the gravitational field strength is weak?

Answer 11

The weight is weaker

Question 12

What is the equation that links weight, mass and gravitational field strength?

Answer 12

Weight = mass x gravitational field strength
(N) (Kg) (N/kg)
W = m x gfs

Question 13

What type of force is thrust?

Answer 13

Contact
Engine provides forward driving force

Question 14

What type of force is gravitational/ weight?

Answer 14

Non contact
Attraction on anything with mass

Question 15

What type of force is reactionary force?

Answer 15

Contact
An equal and opposite reaction force

Question 16

What type of force is friction?

Answer 16

Contact
Force that opposes motion

Question 17

What type of force is air resistance?

Answer 17

Contact
Air particles colliding with a moving object

Question 18

What type of force is tension?

Answer 18

Contact
Force in a stretched or compressed object

Question 19

What type of force is elasticity?

Answer 19

Contact
Restoring elastic force if object is stretched or compressed

Question 20

What type of force is electrostatic?

Answer 20

Non contact
Attraction or repulsion between electric charges

Question 21

What type of force is magnetism?

Answer 21

Non contact
Attraction or repulsion between magnetic poles

Question 22

Define contact force

Answer 22

The objects are physically touching

Question 23

Define non contact forces

Answer 23

The objects are physically separated

Question 24

What happens if the resultant forces equal zero?

Answer 24

The forces are balanced

Question 25

What happens to the movement of the object if the resultant force = zero?

Answer 25

Either move at a constant speed if already moving Or remain stationary

Question 26

What happens if the resultant forces do not equal zero?

Answer 26

The forces are unbalanced

Question 27

What happens to the movement of the object if the resultant forces does not equal zero?

Answer 27

Stationary it will accelerate Moving and resultant force is in same direction it will accelerate Moving and resultant force is in opposite direction it will decelerate

Question 28

Define centre of mass

Answer 28

Point at which the weight of an object appears to act from

Question 29

How do you work out the centre of mass with an unsymmetrical object?

Answer 29

Hang object from a plumb line Draw plum line onto object Repeat from different points on the object Where the lines intersect is the centre of mass

Question 30

What equation links force, mass and acceleration?

Answer 30

Force = mass x acceleration F = m x a (N) (Kg) (m/s^2)

Question 31

Define precise data

Answer 31

Gives similar results if repeated

Question 32

Give equation that links acceleration, final velocity, initial velocity and time taken?

Answer 32

Acceleration = final velocity - initial velocity Time taken

Question 33

Define accurate data

Answer 33

How close your data is to the true value

Question 34

How can accurate data be improved?

Answer 34

Repeating measurements Calculating a mean Drawing a line of best fit (The closer your points are to your line of best fit the more accurate your results)

Question 35

Define random errors

Answer 35

Errors made by carrying out the measuring

Question 36

What do random errors affect.

Answer 36

Precision

Question 37

What are some examples of random errors?

Answer 37

Reading the instrument incorrectly Timing incorrectly

Question 38

Define systematic errors

Answer 38

Caused by faulty equipment that doesn’t reset to zero properly

Question 39

What does systematic errors affect?

Answer 39

Accuracy

Question 40

A larger resultant force leads to

Answer 40

A larger acceleration

Question 41

A larger mass leads to

Answer 41

A smaller acceleration

Question 42

Define terminal velocity

Answer 42

Maximum velocity that a freely falling object will eventually reach

Question 43

What is the equation that links weight, mass and gravitational field strength

Answer 43

W = m x g

Question 44

What is stopping distance?

Answer 44

Stopping distance is the distance an object travels while attempting to stop

Question 45

What is the equation linking thinking distance, braking distance and stopping distance?

Answer 45

Stopping distance = braking distance + thinking distance

Question 46

What are the factors that affect thinking distance?

Answer 46

Distraction Drugs Alcohol Eye sight Tiredness Age

Question 47

What are the factors that affect braking distance?

Answer 47

Condition of brakes Wet/ icy roads Condition of tyres Condition of road

Question 48

What is the method for hooke’s law?

Answer 48

Measure the length of the original spring without weights attached Add more weight to the spring Wait for the spring to stop moving before measuring Calculate total extension using