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P5: Quiz 2– Answers
P5: Quiz 2– Answers
1)
a) Contact forces are forces between two objects that are physically touching one another
b) Non-contact forces are forces between two objects that are not physically touching one another
2)
a) Gravity – non-contact force
b) Friction – contact force
c) Tension – contact force
d) Magnetism – non-contact force
e) Air resistance – contact force
f) Normal reaction force – contact force
g) Electrostatic force – non-contact force
3) An arrow going from the moon to the earth. The arrow needs to be the same length as the arrow from the earth to the moon
a) Contact forces are forces between two objects that are physically touching one another
b) Non-contact forces are forces between two objects that are not physically touching one another
2)
a) Gravity – non-contact force
b) Friction – contact force
c) Tension – contact force
d) Magnetism – non-contact force
e) Air resistance – contact force
f) Normal reaction force – contact force
g) Electrostatic force – non-contact force
3) An arrow going from the moon to the earth. The arrow needs to be the same length as the arrow from the earth to the moon
4)
a) When we place an object on a surface, the surface will exert an equal and opposite force on the object; this is the normal reaction force
b) Weight is a non-contact force
c) An upwards arrow that has the same length as the downwards arrow (weight)
5)
a) An arrow going leftwards that is the same length as the arrow going rightwards
b)
i) They will repel as like/ same poles repel each other
ii) Arrows of the same length going away from each other
i) They will repel as like/ same poles repel each other
ii) Arrows of the same length going away from each other
6)
a) An arrow going towards the left (the length of the arrow does not matter)
b) Contact force
7) The weight arrow going down and the air resistance arrow going up (the length of the arrow does not matter)
7) The weight arrow going down and the air resistance arrow going up (the length of the arrow does not matter)
8) The weight arrow going down and the tension arrow going up. The lengths of the arrows need to be the same.
Questions
1)
a) Give a definition of a contact force.
b) Give a definition of a non-contact force.
2) Say whether the following forces are contact or non-contact forces.
a) Gravity
b) Friction
c) Tension
d) Magnetism
e) Air resistance
f) Normal reaction force
g) Electrostatic force
3) We have the diagram below.
1)
a) Give a definition of a contact force.
b) Give a definition of a non-contact force.
2) Say whether the following forces are contact or non-contact forces.
a) Gravity
b) Friction
c) Tension
d) Magnetism
e) Air resistance
f) Normal reaction force
g) Electrostatic force
3) We have the diagram below.
The diagram shows the force of the earth being attracted to the moon. Draw on the diagram the force of attraction between the moon and the earth.
4)
a) Define what is meant by the normal reaction force.
b) I place a cup on a table. Weight is the force that pulls the cup towards the earth. Is weight a contact or non-contact force?
c) The diagram below shows a cup on a table with the force of weight shown.
4)
a) Define what is meant by the normal reaction force.
b) I place a cup on a table. Weight is the force that pulls the cup towards the earth. Is weight a contact or non-contact force?
c) The diagram below shows a cup on a table with the force of weight shown.
Draw on the normal reaction force.
5) We have two magnets; magnet 1 and magnet 2.
5) We have two magnets; magnet 1 and magnet 2.
a) The above diagram shows the forces of attraction from magnet 1 to magnet 2. Draw the force of attraction from magnet 2 to magnet 1.
b) I now flip magnet 1 – the new position of magnet 1 is shown below.
b) I now flip magnet 1 – the new position of magnet 1 is shown below.
i) Do the magnets attract or repel each other?
ii) Draw the forces acting on the two magnets.
6) The ball below is travelling towards the right.
ii) Draw the forces acting on the two magnets.
6) The ball below is travelling towards the right.
a) Draw an arrow to show the direction of the frictional force (do not worry about the length of your arrow).
b) Is friction a contact or non-contact force?
7) The diagram below shows a skydiver just after he has jumped out of a plane.
b) Is friction a contact or non-contact force?
7) The diagram below shows a skydiver just after he has jumped out of a plane.
On the diagram above, draw arrows to show weight and air resistance (do not worry about the length of your arrow).
8) A hanging basket in a garden is held up by a rope. A diagram of the hanging basket is shown below.
8) A hanging basket in a garden is held up by a rope. A diagram of the hanging basket is shown below.
Draw arrows on the above diagram to show weight and tension.