Mechanics

Question 1

What is force?

Answer 1

Force is a physical quantity that pushes, pulls or twists an object.

Question 2

What is friction?

Answer 2

Friction is a force that opposes motion and is present whenever two surfaces rub over each other.

Question 3

What is drag?

Answer 3

Drag is a force acting opposite to the motion of any object.

Question 4

What is mass?

Answer 4

Mass is the amount of matter in an object. It is measured in kilograms.

Question 5

What is weight?

Answer 5

Weight is the force of gravity acting on a mass. It is measured in newtons.

Question 6

What is gravity?

Answer 6

Gravity is a force by which objects are pulled towards the centre of the earth.

Question 7

A force causes a change in ——– , ———- or ———– for the objects they act upon.

Answer 7

shape, direction, speed

Question 8

Forces are measured in ——– named after the famous scientist ————

Answer 8

newtons, Isaac Newton

Question 9

A rugby player kicks a ball forward into the air. This causes change in ——–

Answer 9

speed

Question 10

Two people pull a rope in opposite directions. The one who applies more force will be the one who moves ———- (forward/backward)

Answer 10

backward

Question 11

A person twists a dish cloth. This changes the ——- of the dish cloth.

Answer 11

shape

Question 12

If the forces acting on an object are at ——— then the object will neither change shape, direction or velocity.

Answer 12

equilibrium

Question 13

If a car is travelling at a —– speed in a straight line , the forces acting on it are at equilibrium.

Answer 13

constant

Question 14

What is air resistance?

Answer 14

Air resistance is a force acting opposite to the motion of any object moving through the air.

Question 15

Different surfaces provide the same amount of friction.(true/false)

Answer 15

False

Question 16

An object will move in the direction that has the (greatest/least)force.

Answer 16

greatest

Question 17

———– ———– is calculated by adding or subtracting all of the forces together.

Answer 17

resultant force

Question 18

The ——— (weight/mass) of an object does not change unless part of the object is removed.

Answer 18

mass

Question 19

The ————- (mass/weight) of an object depends on how much gravity is acting on it.

Answer 19

weight

Question 20

What is the difference between mass and weight?

Answer 20

The mass of an object does not change unless part of the object is removed. The weight of an object depends on the force of gravity acting upon it.

Question 21

On which planet would you weigh the most?

Answer 21

Jupiter because it has more mass.

Question 22

On which planet would you weigh the least?

Answer 22

Mercury because it has the least mass compared to the other planets.

Question 23

———– = ma

Answer 23

F

Question 24

Acceleration is measured in ————-

Answer 24

meters per second

Question 25

weight(w) = ------------- * -----------------

Answer 25

mass (m) , acceleration due to gravity(g)

Question 26

For planets with less gravity, things accelerate ----------(faster/slower)

Answer 26

slower

Question 27

velocity (v) = ----------/----------

Answer 27

distance (d) / time (t)

Question 28

When you go to the moon, will your weight increase or decrease? Why?

Answer 28

Weight will decrease because there is less gravity.

Question 29

Where will you be more heavy? On Mars or on Jupiter?

Answer 29

Jupiter

Question 30

If you go to the moon, what will change and what will remain the same, in terms of mass and weight?

Answer 30

Weight will change. Mass will remain the same.