Forces In Balance

Question 1

what is displacement?

Answer 1

displacement is when you travel a specific distance without changing your direction. In other words, displacement is distance in a certain direction.

Question 2

what are vectors?

Answer 2

vectors are physical quantities that have a direction.

Question 3

acceleration, force, momentum, weight and gravitational field strength are all examples of?

Answer 3

they are all examples of vectors.

Question 4

what do you call a physical quantity that has a size but no specific direction?

Answer 4

scalers

Question 5

speed, distance, time, mass, energy and power are all examples of what?

Answer 5

they are all examples of scalars

Question 6

what is magnitude?

Answer 6

magnitude is the size of a quantity.

Question 7

what has magnitude ( size) as well as a direction?

Answer 7

vectors. unlike scalars, which only have magnitude, vectors have both.

Question 8

when do you need to use a scale diagram?

Answer 8

when more than one force acts on an object, the forces on the object sometimes need to be shown In a scale diagram.

Question 9

here’s a good study tip for you.

Answer 9

force diagrams usually show more than one force. for this reason, the forces in the diagram should always be clearly labelled to identify the force. force diagrams do not always need to be scale diagrams, but if a diagram is a scale diagram, the scale should be shown (e.g. 10mm = 1.0 N)

Question 10

what can be represented by an arrow?

Answer 10

a vector quantity can be represented by an arrow in the direction of the vector and if length in proportion to the magnitude of the vector.

Question 11

what can forces do to things?

Answer 11

forces can change the shape of an object or change its state of rest of its motion.

Question 12

what is a force?

Answer 12

a force is a push or a pull that acts on an object because of its interaction with another object.

Question 13

what are contact forces?

Answer 13

contact forces are when 2 objects must touch each other to interact.

Question 14

can you name 4 example a of a contact force?

Answer 14

examples include friction, air, resistance, stretching forces (or tension) and normal contact forces.

Question 15

when do contact forces occur?

Answer 15

contact forces occur when an object is supported by or strikes another object.

Question 16

magnetic force, electrostatic force and the force of gravity are all examples of what?

Answer 16

Non-contact forces.

Question 17

what is Newtons third law?

Answer 17

Newtaons third law states that when two objects interact whith each other, they exert equal and opposite forces in each other.

Question 18

what is the unit of force?

Answer 18

Newtons (N)

Question 19

what would be a good example of newtons third law ( when 2 objects interact with each other, they exert equal and plopposite forces in each other?)

Answer 19

A boxer who punches a bag with a force of 100N experiences an equal and opposite force of 100N from the bag.

Question 20

what is engine force?

Answer 20

the driving force on a car is the force that makes it move. this is sometimes called the engine or the motive force.

Question 21

what is motive force?

Answer 21

motive force is the same as engine force ( the driving force on a car is the force that makes it move)

Question 22

how is engine force/ motive force caused?

Answer 22

this force is caused by the friction between the ground and the tyre of each drive wheel, friction acts where the tyre comes into contact with the ground.

Question 23

what happens when the car moves forward?

Answer 23

the force of the friction of the road on the tyre is in the forward direction.
the force of the direction of the tyre in the road is in the reverse direction.

Question 24

how do you work out the effect of a force on an object?

Answer 24

you can work out the effect of the force on an object by replacing them with a single force, the resultant force.

Question 25

what is a resultant force?

Answer 25

this is a single force that has the same effect as all the other forces acting on the object. if the resultant force is zero, we say that the forces acting in it are balanced.

Question 26

what is newtons first law?

Answer 26

newton first law of motion states that if the forces acting in an object are balanced, the red grant force on the object is zero, and….
if the object is at rest, it stays stationary.
if the object is moving, it keeps moving with the same speed and in the same direction.

Question 27

what would happen if only 2 forces act on an object with zero resulaltant force?

Answer 27

if only 2 forces act on an object with zero resultant force, the forces must be equal to each other and act in opposite directions.