Physics Test (29/07/21)

Question 1

Define Force & what is force measured in?

Answer 1

Force is strength or energy as an attribute of physical action or movement and is measured in Newtons.

Question 2

Define Weight

Answer 2

Weight is a body’s relative mass; the heaviness of a person or thing.

Question 3

Define Mass

Answer 3

Mass is a large body of matter with no definite shape.

Question 4

Define Density

Answer 4

Density is the degree of compactness of a substance.

Question 5

What are the values for FMA?

Answer 5

Force, Mass, and Acceleration

Question 6

What are the values for VDT?

Answer 6

Speed, Distance, and Time

Question 7

What are the values for AVT?

Answer 7

Acceleration, Speed, and Time

Question 8

Define Friction

Answer 8

Friction is the resistance that one surface or object encounters when moving over another.

Question 9

What is Newtons First Law?

Answer 9

An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.

Question 10

What is Newtons Second Law?

Answer 10

acceleration (gaining speed) happens when a force acts on a mass (object). The greater the mass of the object being accelerated, the greater the amount of force to accelerate the object.

Question 11

What is the difference between weight and mass?

Answer 11

The difference between mass and weight is that mass is the amount of matter in an object, whereas weight is the force exerted on an object by gravity.

Question 12

What is the relationship between density and buoyancy?

Answer 12

The relationship between density and buoyancy is that if an objects average density is less than the surrounding fluid, it will become buoyant.

Question 13

What is the relationship between surface type and friction?

Answer 13

The relationship between surface type and friction is that rougher surfaces have more friction between them, and smoother surfaces have less. Heavier objects also have more friction because they press together with greater force.

Question 14

What are some ways that friction can be reduced?

Answer 14

Way friction can be reduced is making the surface smoother, using lubrication is one way. Reducing the forces acting on the surfaces, and reducing the contact between the surfaces.

Question 15

An example of Newtons First Law of Motion

Answer 15

if a soccer ball was at rest it would stay at rest unless acted upon by an unbalanced force, in this case, it could be afoot kicking it.

Question 16

An example of Newtons Second Law of Motion

Answer 16

if you were to push a car and a truck with the same amount of force, the car would go farther as it has less mass than the truck.

Question 17

How do you measure density?

Answer 17

To measure the density of an object you divide the mass (w x 9.8ms-2) of the object by its volume (l x w x h).

Question 18

What happens when a force acts on an object?

Answer 18

A force acting on an object causes the object to change its shape or size, to start or stop moving, or to accelerate or decelerate.

Question 19

What happens if an unbalanced or balanced force acts on an object?

Answer 19

If an unbalanced force acts on an object, it will result in the objects motion changing (speed up or slow down). If a balanced force is applied with equal strength but acts in opposite directions, the object will not move.

Question 20

What happens to an object at terminal velocity?

Answer 20

At terminal velocity, the weight of the object due to gravity is balanced by the frictional forces, and the resultant force is zero.

Question 21

What is the effect of friction on a moving object?

Answer 21

The effect of friction on a moving object is that if there is more friction it causes the moving object to lose more energy and slow down faster.