P8 - Forces In Balance

Question 1

What is Distance?

Answer 1

Distance is the length travelled

Question 2

What is displacement?

Answer 2

Displacement is distance without change of direction. In other words displacement is the distance in a given direction.

Question 3

What is a Scalar quantity?

Answer 3

A scalar quantity is magnitude without direcrion

Question 4

What is a vector quantity?

Answer 4

A vector quantity is magnitude with direction.

Question 5

Give an example of a scalar quantity.

Answer 5

Distance, speed, time, mass, energy and power

Question 6

Give an example of a vector quantity

Answer 6

Acceleration, force, momentum, weight and gravitational field strength

Question 7

How is a vector quantity represented?

Answer 7

The direction of the arrow represents the direction of the vector quantity. The length of the vector quantity represents the magnitude of the vector quantity.

Question 8

What is a force?

Answer 8

A force is a push or a pull that acts upon an object due to its interaction with another object.

Question 9

What are forces measured in?

Answer 9

Newtons, N

Question 10

Give some examples of what a force can do to an object?

Answer 10

It can change the shape of am object, start or stop it moving, or change its direction.

Question 11

What is a contact force?

Answer 11

A contact force is a force that requires 2 or more objects to physically touch each other to occur

Question 12

What is a non contact force?

Answer 12

A non contact force is a force that acts upon an object without coming physically in contact with it.

Question 13

Give some examples of a contact force.

Answer 13

Friction, air resistance, water resistance and tension

Question 14

Give some examples of non-contact forces

Answer 14

Magnetic force, electrostatic force and gravity.

Question 15

What is Newtons third law of motion?

Answer 15

When 2 objects interact with each other, they exert equal and opposite forces on each other.

Question 16

Give an 2 examples of newtons third law of motion in action

Answer 16

If a boxer punches a bag with a force of 100N, he will experience an equal and opposite force of 100N.
If a rocket exerts a force of 1 Million Newtons downwards it will experience an equal and opposite force of 1 Million Newtons pushing it upwards.

Question 17

What is driving force.

Answer 17

Driving force is the force from the tyre of a car pushing backwards on the floor, when a car is driving

Question 18

What is the equal and opposite force to driving force?

Answer 18

Friction from the ground

Question 19

What is resultant force?

Answer 19

If an object has more than 1 force acting upon it then the resultant force of the object is the single force that has the same effect as all the forces acting upon the object.

Question 20

What is newtons first law of motion?

Answer 20

If the forces acting upon an object are balanced the resultant force is zero and therefore:
°If the object is at rest it will stay at rest.
°If the object is in motion it will stay in motion.
(Objects in motion tend to stay in motion and objects at rest tend to stay at rest unless acted upon by an unbalanced force)

Question 21

How do you find the resultant force of 2 forces going in the same or opposite directions?

Answer 21

If the forces are going in the same direction you add the forces to find the resultant force and if they are going in opposite directions you subtract the smaller force from the larger force.

Question 22

What is the line of action of a force?

Answer 22

The line of action is the line that the force acts along

Question 23

What is equilibrium? (forces)

Answer 23

Equilibrium is when the resultant force on the object is 0

Question 24

What is the centre of mass?

Answer 24

The point at which its mass can be thought of as being concentrated

Question 25

What is a load?

Answer 25

the weight of an object raised by a device used to lift the object, or the force applied by a device when it is used to shift an object

Question 26

What is friction?

Answer 26

the force opposing the relative motion of two solid surfaces in contact

Question 27

What is a free-body diagram?

Answer 27

a diagram that shows the forces acting on an object without any other objects or forces shown

Question 28

What is a force multiplier?

Answer 28

a lever used so that a weight or force can be moved by a smaller force

Question 29

What is a parallelogram of forces?

Answer 29

a geometrical method used to find the resultant of two forces that do not act along the same line

Question 30

What is the principle of moments?

Answer 30

When an object is not moving: the sum of all the clockwise moments about any point = the sum of all the anticlockwise moments about that point

Question 31

How do you perform the paralleogram of forces?

Answer 31

Use a compass to find the bisector of the 2 forces and the resultsnt force will be from the source point to the bisected point

Question 32

What type of force is electrostatic?

Answer 32

non-contact

Question 33

What is the downward force on a body known as?

Answer 33

Weight