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1. A friend has given you a special gift, a box of

mass 10.0 kg with a mystery surprise inside. The box

is resting on the smooth horizontal surface of a table.

a) Determine the weight of the box.

b) How many forces act on the box?

c) In what directions do they act?

d) What is the magnitude of the force exerted

on the box by the table?

e) What is the net force on the box?

2. Now your friend pushes down on the box with a

force of 40.0 N.

a) How many forces are acting on the box?

b) What is the magnitude of the normal force

acting on the box?

c) Why is the box at rest?

3. Your friend pulls upward on the box with a force

of 40.0 N

a) Is the box’s weight still the same?

b) What is the normal force on the box?

c) Why doesn’t the box move?

d) What is the net force?

15. Nick is talking to his friend Kate who managed to get her car out of the

mud without outside help. Read the conversation filling in the words

from the list:

midpoint, short cut, lonely, magnify, smooth, maximum, at a loss, exceed, tied,

stuck, boot

N: Well, Kate I really can’t understand what made you choose that rough track

through the a) ……… countryside, while there is a wonderful b) ………

motorway to drive on?

K: I was late for my grandmother’s birthday, so I decided to take a c) …….. to

save the time.

N: What did you feel when you found your car d) ………. in the mud?

K: At first, I felt e) ……… because there was nobody around to ask for help.

20 1. A friend has given you a special gift, a box of mass 10.0 kg with a mystery surprise inside. The box is resting on the smooth horizontal surface of a table. a) Determine the weight of the box. b) How many forces act on the box? c) In what directions do they act? d) What is the magnitude of the force exerted on the box by the table? e) What is the net force on the box? 2. Now your friend pushes down on the box with a force of 40.0 N. a) How many forces are acting on the box? b) What is the magnitude of the normal force acting on the box? c) Why is the box at rest? 3. Your friend pulls upward on the box with a force of 40.0 N a) Is the box’s weight still the same? b) What is the normal force on the box? c) Why doesn’t the box move? d) What is the net force? 15. Nick is talking to his friend Kate who managed to get her car out of the mud without outside help. Read the conversation filling in the words from the list: midpoint, short cut, lonely, magnify, smooth, maximum, at a loss, exceed, tied, stuck, boot N: Well, Kate I really can’t understand what made you choose that rough track through the a) ……… countryside, while there is a wonderful b) ……… motorway to drive on? K: I was late for my grandmother’s birthday, so I decided to take a c) …….. to save the time. N: What did you feel when you found your car d) ………. in the mud? K: At first, I felt e) ……… because there was nobody around to ask for help.

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