Cause of Teenage Pragnancy

Topics: Mass, Kinetic energy, Force Pages: 3 (813 words) Published: April 8, 2013
CLASSTEST1 20 FEBRUARY 2013 DURATION: 1 HOUR
MARKS: 55
This question paper consists of TWO sections:
SECTION A
SECTION B
You may use a non-programmable calculator.
You may use appropriate mathematical instruments.
Number the answers correctly according to the numbering system used in this question paper.

SECTION A
QUESTION 1: ONE-WORD ITEMS
Give ONE word/term for each of the following descriptions. Write only the word/term next to the question number (1.1–1.5) in the ANSWER BOOK.
1.1The type of energy an object has due to its motion
[1]

QUESTION 2: MULTIPLE-CHOICE QUESTIONS
Four options are provided as possible answers to the following questions. Each question has only ONE correct answer. Write only the letter (A–D) next to the question number (2.1–2.10) in the ANSWER BOOK.

2.1 A car of mass m collides head-on with a truck of mass 2m. If the car exerts a force of magnitude F on the truck during the collision, the magnitude of the force that the truck exerts on the car is …

A
2.2 An object moves in a straight line on a ROUGH horizontal surface. If the net work done on the object is zero, then …

A. the object has zero kinetic energy.
B. the object moves at constant speed.
C. the object moves at constant acceleration.
D. there is no frictional force acting on the object.

SECTION B
INSTRUCTIONS AND INFORMATION
Round off your final numerical answers to a minimum of TWO decimal places. QUESTION 3 (Start on a new page.)
A stone is thrown vertically upward at a velocity of 10 m·s-1 from the top of a tower of height 50 m. After some time the stone passes the edge of the tower and strikes the ground below the tower. Ignore the effects of friction.

3.1 Draw a labelled free-body diagram showing the force(s) acting on the stone during its motion.(1)
3.2 Calculate the:
3.2.1 Time taken by the stone to reach its maximum...