Quiz: Forces

 1. A push or a pull on an object is:A a forceB inertiaC its weight 2. Forces are measured in units called:A kilogramsB newtonsC joules 3. Forces can change the:A slow down or speed up objects onlyB speed, direction or shape of an objectC movement of objects but only if they were already in motion 4. Balanced forces act on objects that are:A stationaryB in motionC rising or falling 5. An example of unbalanced forces in action is:A a boat floating on still waterB a person sitting on a chairC a rising balloon 6. Sir Isaac Newton stated that for every action, there was:A an equal and opposite reactionB movement in a direction that was the same as the motionC 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 firedB the upward movement of a balloon after the air has been releasedC both of the above 8. The rule to calculate Force is:A mass / speedB mass × accelerationC weight × acceleration 9. Weight is a force of gravity where the gravitational acceleration is:Athe pull of gravity exerted on an object on earthBthe rate of increase of speed of falling objectsCthe 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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