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P5: Quiz 15 – Answers
P5: Quiz 15 – Answers
1) “Equal” and “opposite” (you can have them in either order)
When two objects interact, the forces that they exert on each other are EQUAL and OPPOSITE.
2)
a)
i) 150 N
ii) Normal contact force
b) 240 N
3)
a) 147 N
b) F = ma (or force = mass x acceleration). Force is measured in Newtons (N), mass is measured in kilograms (kg) and acceleration is measured in metres per second squared (m/s2)
c) 2.1 m/s2
d) 2.45 m/s2
Questions
1) Fill in the gaps in the sentence below.
1) Fill in the gaps in the sentence below.
“When two objects interact, the forces that they exert on each other are ______ and ______.”
2) The diagram below shows an individual pushing a wall with a force of 150 N.
a)
i) What will be the size of the force that the wall exerts on the individual?
ii) What is the name of this force?
b) The individual now pushes against the wall harder and exerts a force of 240 N. What will be the size of the force that the wall now exerts on the individual?
3) Two ice skaters are next to each other. Ice skater A has a mass of 70 kg and ice skater B has a mass of 60 kg. They then push away from each other and ice skater A exerts a force of 147 N on ice skater B.
i) What will be the size of the force that the wall exerts on the individual?
ii) What is the name of this force?
b) The individual now pushes against the wall harder and exerts a force of 240 N. What will be the size of the force that the wall now exerts on the individual?
3) Two ice skaters are next to each other. Ice skater A has a mass of 70 kg and ice skater B has a mass of 60 kg. They then push away from each other and ice skater A exerts a force of 147 N on ice skater B.
a) What is the force exerted by ice skater B onto ice skater A?
b) Write the equation for Newton’s second law – include the units for each of the variables.
c) Calculate the acceleration of ice skater A.
d) Calculate the acceleration of ice skater B.
b) Write the equation for Newton’s second law – include the units for each of the variables.
c) Calculate the acceleration of ice skater A.
d) Calculate the acceleration of ice skater B.