Download Worksheet

Worksheet M.1
Acceleration & Force
Name: _________
Date: _________
I. Multiple choice. Circle the correct answer:
1. A force is described by ________________.
a) its strength only
b) its direction only
c) its strength and direction
d) its movement
2. What is the SI unit for force?
a) meter
c) gram
b) meters per second
d) newton
3. When the forces acting on an object are balanced, the net force on the object is ______.
a) less than 10
b) exactly 0
c) less than 0
d) more than 0
4. Friction acts ______________.
a) in the same direction as motion
b) only on objects that are not in motion
c) in the opposite direction of the motion
d) in both directions
5. The friction on an object moving through water or air is ____________.
a) fluid friction
b) rolling friction
c) sliding friction
d) static friction
6. The amount of gravity between 2 objects depends on their masses and the ________.
a) distance between them
b) friction between them
c) total velocity of the objects
d) air resistance between them
7. The force of gravity on an object is known as its _______________.
a) acceleration
b) mass
c) weight
d) velocity
8. Air resistance acts in what direction on a falling object?
a) upward
b) sideways
c) downward
d) both upward and downward
9. A (An) __________ causes an object’s motion to change.
a) inertia
b) unbalanced force
c) balanced force
d) speed
Prepared by Mr. Victor
II. Completion. Complete the sentences with the words from the box. Be aware that one word
is not used:
mass
weight
force
velocity
free fall
static
10. A push or a pull is a ______________.
11. Friction between 2 objects that are not moving is ______________ friction.
12. If gravity is the only force acting on an object, the object is in ______________.
13. The measure of the amount of matter in an object is the object’s ______________.
14. The momentum of an object depends on its mass and its ______________.
III. True or False.
__________ 15. Unbalanced forces change an object’s motion.
__________ 16. Friction causes moving objects to speed up.
__________ 17. The force of gravity between 2 objects gets stronger as the objects move
further apart.
__________ 18. The inertia of an object depends on its mass.
__________ 19. A centripetal force is the force that keeps a satellite in orbit.
IV. Solve the exercises:
20. As a bike starts down a slope, its speed is 6 m/s. But 5 s later, at the bottom its speed is
24 m/s. What is the average acceleration of the bike?
21. You exert a force of 90 N on a box. Your friend exerts a force of 80 N in the same direction.
What is the net force?
22. What is the net force on a 700 kg object accelerating at 4 m/s2?
23. What net force is needed to accelerate a 30 kg cart at 12 m/s2?
24. What is the momentum of a 5 kg cat running at 7 m/s?
25. A golf ball travels at 15 m/s while a football moves at 8 m/s. The mass of the golf ball is
0.05 kg and the mass of the football is 0.4 kg. Which has a greater momentum?
Prepared by Mr. Victor