P8- Forces in Balance

Question 1

What does a scalar quantity have?

Give some examples

Answer 1

A scalar quantity has magnitude.
Speed
Distance
Temperature

Question 2

What does a vector quantity have?

Give some examples

Answer 2

It has magnitude and direction.
Velocity
Displacement
Force

Question 3

What is a contact force?

Give some examples

Answer 3

A force which must touch another force for the force to act
Air resistance
Friction

Question 4

What is a non contact force?

Give some examples

Answer 4

A non contact force is a force which doesn’t need to touch another force to act.
Magnetic force
Gravitational force

Question 5

What is the difference between weight and mass?

Answer 5

Mass is just the amount of stuff in an object whereas weight is the force acting on an object due to gravity

Question 6

What is the formula for weight?

Answer 6

Weight = Mass x Gravitational field strength

Question 7

What is the resultant force?

Answer 7

The resultant force is the total force on a point or object

Question 8

What does a free body diagram do?

Answer 8

It shows you all the forces acting on an object

Question 9

What is the formula for work done?

Answer 9

Work done = Force x Distance

Question 10

What does it mean when an object is in equilibrium?

Answer 10

It means that the forces are balanced

Question 11

What is the formula for moment?

Answer 11

Moment = force x distance

Question 12

What do levers do?

Answer 12

They increase the distance from the pivot

Question 13

What is displacement?

Answer 13

1) Displacement is distance in a given direction.

Question 14

What does Newton’s thrid law state?

Answer 14

1) Newton’s 3rd law states that when 2 objects interact, they always exert equak and opposite forces on eachother.

Question 15

Explain what a contact force is.

Answer 15

1) A contact force is a force that acts on objects only when the objects touch eachother.

Question 16

Explain what driving force and how friction helps a car move along the road.

Answer 16

1) The driving force on a car is the force that makes the car move.
2) The driving force pushes the car forward because there is frction between the ground and the tyre of each drive wheel. Friction acts when the tyre is in contact with the ground.

Question 17

Explain what happens when a car moves foward

Answer 17

When a car moves forward:
1) The force of the friction of the road on the tyre is in the forward direction.
2) The force of the friction of the tyre on the road is in the reverse direction.
These 2 forces are equal and opposite to eachother.