Date Grade 11 Physics Name: Test - Weebly

Date KU: ______/28

APP: ______ /5

Grade 11 Physics Test

T: _______/4

Name: ________________________ C: _______/5

Communication ? Marks are based on correct direction, units, sig figs, and symbols in all solutions.

PART A: Multiple Choice ? Circle the best answer on the page.

1) Circle the two forces that are not fundamental forces: 2 marks KU

a. Gravitational Force

d. Weak Nuclear Force

b. Friction Force

e. Strong Nuclear Force

c. Electromagnetic Force

f. Normal Force

2) Look at the forces depicted in the box on the left. Choose a box which best represents the resultant net force. All of the diagrams are accurately scaled. 1 mark KU

3) A planet of mass m = 1x1023 kg is located at a distance of 1x108 km away from its sun. The gravitational

force of attraction that the planet experiences is F = 6.67 x 1020 N. The universal gravitational constant is

G = 6.67 x 10-11 Nm2/kg2. What is the mass of the sun? 1 mark A

a. 1x1010 kg

b. 1x1020 kg

c. 1x1030 kg

d. 1x1040 kg

4) A Thornlea student weighs 500 N on Earth. The planet Saturn is 100 times the mass of Earth and its radius

is 10 times greater than Earth's radius. How much will she weigh on Saturn? 1 mark KU

a. 5 N

c. 50,000 N

b. 500 N

d. 5,000,000 N

5) The gravitational field intensity on Earth's surface g = 9.8 N/kg. What is the value of g at a distance of 3

Earth radii from Earth's centre? 1 mark KU

a. 19.6 N/kg

c. 0.60 N/kg

b. 1.08 N/kg

d. 1.26 N/kg

6) A man of mass M = 60.0 kg and a child of mass m = 45.0 kg stand facing each other on an ice rink, both

wearing ice skates. The child pushes the man with a horizontal force F = 30.0 N [E]. Assume the ice is

frictionless. What is the man's acceleration? 1 mark KU

a. 1.5 m/s2 [E]

c. 0.5 m/s2 [E]

b. 1.5 m/s2 [W]

d. 0.5 m/s2 [W]

7) What is the acceleration of the child in question 7? 1 mark KU

a. 0.55 m/s2 [W]

c. 0.45 m/s2 [E]

b. 0.66 m/s2 [W]

d. 0.00 m/s2 (because the man was pushed)

Date

Grade 11 Physics

Name: ________________________

Test

PART B: Write full solutions on lined paper. Please start each question on a new page. Show all steps and

substitutions. Include diagrams where possible. Final statements are required after calculations.

1) Watch as the teacher performs a demonstration. a. Circle one ? which of the following statements best describes the inertia of the boxes? 2 marks A i. The cards in the box have a lot more inertia. ii. The cards with the rubber band have a lot more inertia. iii. Both objects have about the same amount of inertia. b. How would Sir Isaac Newton explain what happened using his first law? Use correct scientific terminology for full marks. 4 marks A

2) Sir Isaac Newton is sitting on the ground with his back against an apple tree. An apple at rest falls from a height of 2.8 m above the ground and hits the top of his head. The top of his head is 0.8 m above the ground. a. How long did it take the apple to hit Isaac Newton? 2 marks KU b. What is the impact velocity of the apple as it hits him? 1 mark KU

3) An elevator (m=1000 kg) is accelerating down 3.0 m/s2. a. Draw a free-body diagram of the elevator. 1 mark KU b. Calculate the net force on the elevator. 1 mark KU c. Calculate the force in the cable that is lowering the elevator down. 2 marks KU

4) A large wood box of mass 70 kg is attached with a rope to a smaller metal box of mass 30 kg. A man named Magneto is using his special powers to pull on the steel box with a force of 300N. The boxes are sliding on ice. Assume there is no friction. a. Draw a free body diagram for each box. 2 marks KU b. What is the acceleration of each box? 4 marks KU c. Calculate the action and reaction (tension) forces on the boxes. 2 marks KU

5) Box 1 and box 2 are placed side by side. A man pushes on Box 1 with a force FM. Both boxes feel friction forces. Draw a correctly labeled FBD for each box. 2 marks KU

6) Batman is pushing a 200.0 kg wood box on a concrete floor. The coefficient of static friction is s = 0.6 and the coefficient of kinetic friction is k = 0.5. a. What is the force of static friction? 1 mark KU b. What is the force of kinetic friction? 1 mark KU c. If Batman applies a force of 1000 N, will the box accelerate? Why or why not? 2 mark KU

7) A few grade 11 physics students are performing a lab on Newton's second law like the one we did in class. For part A: they measured the acceleration of the cart for different trials. In each trial, they moved a 200g mass from the cart to the end of the hanging string. They plotted a graph of their results and attained this equation: a = 0.286F. a. What information does the number 0.286 provide? (Provide the magnitude of this value to 3 significant digits) 1 mark T b. One student performed this experiment in the following way: She found 200g masses in a box and added them to the hanging string for each trial. She did not transfer any masses from the cart to the end of the string. She still found that acceleration increased as force increased. Identify her mistake and explain why it is a problem. 3 marks T

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