Forces end of year test

Question 1

What is a force?

Answer 1

Push or pull.

Question 2

What instrument measures force?

Answer 2

Newton meter.

Question 3

What is the unit of force?

Answer 3

Newton (N).

Question 4

Define contact force.

Answer 4

Acts when objects touch.

Question 5

Name two non-contact forces.

Answer 5

Gravity, magnetism.

Question 6

What is an interaction pair?

Answer 6

Equal and opposite forces.

Question 7

What is mass measured in?

Answer 7

Kilograms (kg).

Question 8

What is weight?

Answer 8

Force of gravity on mass.

Question 9

How is weight calculated?

Answer 9

Weight = mass × gravity.

Question 10

What is Earth’s gravitational field strength?

Answer 10

About 10 N/kg.

Question 11

What force opposes motion between surfaces?

Answer 11

Friction.

Question 12

How can friction be reduced?

Answer 12

Add lubrication.

Question 13

Name a useful example of friction.

Answer 13

Walking or bike brakes.

Question 14

What is air resistance?

Answer 14

Drag in air.

Question 15

How does streamlining affect drag?

Answer 15

Reduces drag.

Question 16

What is water resistance?

Answer 16

Drag in water.

Question 17

Why does a parachute increase drag?

Answer 17

Increases surface area.

Question 18

What is a magnetic force?

Answer 18

Non-contact force between magnets.

Question 19

What is electrostatic force?

Answer 19

Non-contact force between charges.

Question 20

What force pulls objects toward Earth?

Answer 20

Gravity.

Question 21

Define balanced forces.

Answer 21

Equal, opposite forces.

Question 22

What happens to an object in equilibrium?

Answer 22

Stays still or moves steadily.

Question 23

What is a reaction force?

Answer 23

Support force balancing weight.

Question 24

What force acts upward in water?

Answer 24

Upthrust.

Question 25

What happens if forces are unbalanced?

Answer 25

Object accelerates.

Question 26

Why does a book stay still on a table?

Answer 26

Weight and reaction are balanced.

Question 27

What force balances weight?

Answer 27

Reaction force.

Question 28

What is lifting force?

Answer 28

Force pushing/pulling up.

Question 29

What happens if upward force > weight?

Answer 29

Object moves up.

Question 30

What is compress?

Answer 30

To squash.

Question 31

What is Hooke’s Law?

Answer 31

Extension is proportion to the force applied

Question 32

What is an extension?

Answer 32

Stretch increase.

Question 33

What happens if a spring exceeds its elastic limit?

Answer 33

Permanently deformed.

Question 34

What force makes a spring return to its original length?

Answer 34

Tension.

Question 35

If a spring stretches 2 cm under 5 N, how much under 10 N?

Answer 35

4 cm.

Question 36

What is the elastic limit?

Answer 36

Max force before permanent change.

Question 37

What is tension?

Answer 37

Pulling force in object.

Question 38

What is deformation?

Answer 38

Shape change by force.

Question 39

What is a linear relationship in Hooke’s Law?

Answer 39

Force and extension both increase.

Question 40

What happens if a spring is overstretched?

Answer 40

Won’t return to original length.

Question 41

What is a field in physics?

Answer 41

Area with non-contact force.

Question 42

How does gravitational field strength change with distance?

Answer 42

Gets weaker.

Question 43

What is magnetic field strength affected by?

Answer 43

Distance and magnet size.

Question 44

What is equilibrium?

Answer 44

Forces balanced.

Question 45

What is a kilogram (kg)?

Answer 45

Unit of mass.

Question 46

Why is mass constant everywhere?

Answer 46

Depends on matter, not gravity.

Question 47

Why does weight change on the Moon?

Answer 47

Weaker gravity there.

Question 48

What is a support force?

Answer 48

Force opposing weight.

Question 49

What is the relationship between force and acceleration?

Answer 49

More force = more acceleration.

Question 50

What is lubrication?

Answer 50

Substance to reduce friction.