Quiz: Forces

1. A push or a pull on an object is:
A a force
B inertia
C its weight
2. Forces are measured in units called:
A kilograms
B newtons
C joules
3. Forces can change the:
A slow down or speed up objects only
B speed, direction or shape of an object
C movement of objects but only if they were already in motion
4. Balanced forces act on objects that are:
A stationary
B in motion
C rising or falling
5. An example of unbalanced forces in action is:
A a boat floating on still water
B a person sitting on a chair
C a rising balloon
6. Sir Isaac Newton stated that for every action, there was:
A an equal and opposite reaction
B movement in a direction that was the same as the motion
C a force of gravity also acting
7. An example of action and reaction is:
A the recoil of a gun after the bullet has been fired
B the upward movement of a balloon after the air has been released
C both of the above
8. The rule to calculate Force is:
A mass / speed
B mass × acceleration
C weight × acceleration
9. Weight is a force of gravity where the gravitational acceleration is:
Athe pull of gravity exerted on an object on earth
Bthe rate of increase of speed of falling objects
Cthe speeds of objects on different planets
10. If a person has a mass of 50 kilograms, the person's weight in newtons will be about:
A500
B50
C100
11. Friction acts:
Aonly when an object is in motion
Bwhether an object is moving or not
Con stationary objects only
12. The size or magnitude of a frictional force depends on:
Athe forces pushing the surfaces together
Bthe roughness of the contact surfaces
Cboth of the above
13. An example of sliding friction is:
Awriting in pencil
Bmoving a refrigerator with a rolling trolley
Ca person sitting on a chair
14. An example of rolling friction is:
Awhen a car drives along a road
Bskateboarding in a half-pipe
Cboth of the above
15. To reduce friction, one could:
Aremove wheels to reduce the downward pressure in trolleys
Buse a lubricant such as grease
Cplace extra weight on the object that is moving
 
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