P5 Forces

Question 1

Define the term vector

Answer 1

A vector has magnitude and direction

Question 2

Whats a non-contact force ??

Answer 2

Objects that are physically separated

Question 3

Whats a contact force ??

Answer 3

Objects that are physically touching

Question 4

What happens to gravity when the mass increases??

Answer 4

The field gets stronger, mass gets larger and the attraction is greater.

Question 5

What is the Formula used for weight

Answer 5

Weight= mass x grams

Question 6

Explain the term resultant force ??

Answer 6

Resultant force is a single force representing the sum of all the forces acting on an object.

Question 7

There are two forces on the falling skydiver - its weight and air resistance.
What causes the weight?

Answer 7

So the air resistance increases and the weight of the diver decreases.

Question 8

What happens to the skydivers speed as he falls from the plane??

Answer 8

The divers speed increases as he goes down.

Question 9

What is the meaning of work and the formula used

Answer 9

Where distance is distance moved along the line of action of the force. Work Done = Force × Distance

Question 10

What is deformation ???

Answer 10

Deformation means changing shape

Question 11

What is the Formula used for moments of a force??

Answer 11

Moment= force x perpindicular distance

Question 12

Definiton of pressure

Answer 12

When Particles in a gas move randomly in every direction and they exert forces on their container, which is
felt as press

Question 13

Explain the term upthrust

Answer 13

A partially submerged object experiences a greater pressure on the bottom surface than on the top surface. This creates a resultant force upwards which is known as upthrust.

Question 14

What is displacement ???

Answer 14

Displacement includes both the distance an object moves, measured in a straight line from the start point to the nish point and the direction of that straight line. Displacement is a vector quantity.

Question 15

Equation used for speed

Answer 15

Speed= distance/time

Question 16

Which are the two diferrent graphs used for acceleration ??

Answer 16

Displacement-Time Graphs

Velocity time graphs

Question 17

What are displacement time graphs??

Answer 17

The gradient of a velocity-time graph at a particular time gives the acceleration of the object at that time. The area under a velocity-time graph gives the displacement

Question 18

What are velocity time graphs??

Answer 18

If an object moves along a straight line, its motion can be represented by a velocity-time graph. The gradient of the line is equal to the acceleration of the object

Question 19

What is average speed??

Answer 19

when the speed changes during the motion

Question 20

What is newtons first law??

Answer 20

An object has a constant velocity unless acted on by a resultant force.

Question 21

What is newtons second law??

Answer 21

The acceleration of an object is proportional to the resultant force acting on the object, and inversely proportional to the mass of the object.
Force = mass x acceleration

Question 22

What is newtons third law??

Answer 22

Whenever two objects interact, the forces they exert on each other are equal and opposite.
Eg- Rocket taking off

Question 23

Explain Thinking distance and braking distance

Answer 23

Thinking distance- is the time it takes for you to activate your brakes.

Braking distance- refers to the distance a vehicle will travel from the point when its brakes are fully applied.

Question 24

what is the formula used for stopping distance??

Answer 24

Stopping distance= thinking+Braking distances

Question 25

Explain the term momentum and the formula used for it.

Answer 25

Momentum is always conserved in a collision or explosion (where there are no external forces like friction, air resistance, electrostatic attraction etc.)

Momentum= mass x velocity