2)

HORIZON INTERNATIONAL BILINGUAL SCHOOL

PHYSICS SECOND TERM FINAL EXAMINATION

10th

Class ψ

Duration: 45 min

A 60-kg crate is moved up an inclined ramp as

shown in figure. A 400-N force, parallel to the

ramp, is needed to slide the crate up the ramp at a

constant speed.

How much work is done in sliding the crate up the

ramp?

Name:

Surname:

1)

3)

4)

5)

7)

8)

9)

The kinetic energies of three objects K, L and M on a horizontal

frictionless plane are EK, EL and EM.

Compare and rank the kinetic energies EK, EL and EM?

A bead slides on a curved wire, starting from rest at point

A. If the wire is frictionless, find the types of energy it has

at the points A, B and C. (K.E=kinetic energy

P.E= potential energy)

A B C

A) P.E K.E P.E

B) K.E P.E+K.E K.E

C) P.E K.E P.E+K.E

D) P.E+K.E K.E P.E

E) P.E none K.E

A) 1200 J B) 800 J

C) 600 J D) 400 J

A 36-kg child slides down a

playground slide that is 2.5 m

high. At the bottom of the slide,

she is moving at 3 m/s. How

much energy was lost as she slid

down the slide?

A) 900 J B) 738 J C) 162 J D) 1062 J E) none

The illustration below shows a ball on a curved track. The

ball starts with zero velocity at the top of the track. It then

rolls from the top of the track to the horizontal part at the

ground. Ignoring friction, its velocity just at the moment it

reaches the ground is 20 m/s. What is the height, h, from the

ground to the top of the track?

A) 20 m

B) 15 m

C) 10 m

D) 5 m

E) 1 m

At which point on the track is the car’s gravitational potential

energy the greatest?

A) A B) B C) C D) D E) E F) F

And the least?

A) A B) B C) C D) D E) E F) F

At which point is the car’s kinetic energy the greatest?

A) A B) B C) C D) D E) E F) F

g=10 N/kg

6) Two cars are traveling at the same constant speed v. Car A is

moving along a straight section of the road, while B is rounding a

circular turn. Which statement above is true about the acceleration

of the cars? (Hint: Remember circular motion)

(a) The acceleration of both cars is zero, since they are

traveling at a constant speed.

(b) Car A is accelerating, but car B is not accelerating.

(c) Car A is not accelerating, but car B is accelerating.

(d) Both cars are accelerating

Good Luck!

16) The kinetic energy of an object changes when which of the

following changes?

a) the object’s chemical potential energy b) the object’s volume

c) the object’s direction of motion d) the object’s speed

11) Three particles have the following masses and move on

three different circles with the following speeds and radii.

Rank the particles according to the magnitude of the

centripetal force that acts on them, largest first.

a) 1, 2, 3 b) 1, 3, 2 c) 2, 1, 3 d) 2, 3, 1 e) 3, 2, 1

15) A daredevil on a motorcycle leaves the end of a ramp with

a speed of 20 m/s as in figure. If his speed is 10 m/s when he

reaches the peak of the path, what is the maximum height that

he reaches? Ignore friction and air resistance.

10) The drawing shows two identical stones attached to cords

that are being whirled on a tabletop at the same speed. The

radius of the larger circle is twice that of the smaller circle.

How is the tension T1 in the longer cord related to the tension

T2 in the shorter cord?

a) T1 = T2

b) T1 = 2T2

c) T1 = 4T2

d) T1 = 1/2T2

e) T1 = 1/4T2

14) The same force F pushes in three different ways on a box

moving with a velocity v, as the drawings show. Rank the

work done by the force F in ascending order (smallest first):

a) A, B, C b) A, C, B c) B, A, C d) C, B, A e) C, A, B

12) The drawing shows an extreme skier at the bottom of a ski

jump. At this point the track is circular with a radius r. Two

forces act on the skier, her weight mg and the normal force FN.

Which relation describes how the net force acting on her is

related to her mass m and speed v and to the radius?

17) The gravitational potential energy of an object changes

when which of the following changes?

a) the object’s speed b) the object’s mass

c) the object’s temperature d) the object’s length

18) The SI unit of energy is the joule (J). Which of the following

is an equivalent way of expressing this unit?

a) kg.m b) kg.m2/s2 c) kg.m/s d) kg.m2/s e) kg.m/s2

a)

b)

c)

d)

13) For which of the following is kinetic energy converted into

potential energy?

A) a boulder rolls down a hill B) a ball is thrown upward

C) a swing comes to a stop D) a bowling ball rolls horizontally

a) 20 m

b) 15 m

c) 10 m

d) 5 m

e) 2 m