Name:

Multiple choice questions on forces

Choose the best possible answers

1.  What is the best description for this distance time graph:

 (a)  Distance Time
 A      stopped B    steady speed C     acceleration D    deceleration E    increasing acceleration

2.  What is the best description for this graph:

 Distance Time
 A    stopped B   steady speed C     acceleration D    deceleration E    increasing acceleration

3.  What is the best description for this graph?

 Velocity Time
 A     stopped B   steady speed C     acceleration D    deceleration E    increasing acceleration

4.  What is the best description for this graph?

 Velocity time
 A     stopped B    steady speed C     acceleration D    deceleration E    increasing acceleration

5.  What is the formula for calculating speed?

 A     speed = distance x time B   speed = distance / time C     speed = distance / acceleration D    speed = acceleration / time E    speed = time / distance

6.  If an object speeds up from 20m/s to 100m/s in 4s, what is its acceleration?

 A     20m/s2 B   200m/s2 C     25m/s2 D    5m/s2 E    30m/s2

7.  What does the gradient of distance time graph tell us?

 A  acceleration B   distance C height of slope D    speed E    displacement

8.  What is the unit of speed?

 A     metre B   second C     metre per second squared D    metre per second E    second squared

9. If a plane goes 2000m in 10 seconds - what is it's speed?

 A     20m/s B   200m/s C     25m/s D    5m/s E    30m/s

10. What is the difference between velocity and speed?

 A     speed needs a direction B   speed is a vector C     velocity is scalar D    velocity is when speed is increasing E    velocity is speed in one direction

11.  What does the gradient of a velocity/time graph tell us?

 A     acceleration B   distance travelled C     height of slope D    speed E    displacement

12.  What does the area under the graph tell us?

 A     acceleration B   distance travelled C     height of slope D    speed E    average velocity

13.  What is the formula that connects acceleration, velocity and time?

 A     v = change in a / t B    a = v /t C     t = change in v / a D    a = change in v / t E    acceleration = speed / time

14.  Someone's car will not start, so two friends help them by pushing it

By pushing as hard as they can for 10 seconds they make the car reach a speed of 2 metres per second
Calculate the acceleration they give to the car.

 A          20 m/s2 B          12 m/s2 C          0.4m/s2 D          0.2m/s2 E          5m/s2

15.  Another motorist has the same problem.  The two friends push the car along the same stretch of road with the same force as before.

It takes them 8 seconds to get the second car up to a speed of 2 metres per second.

Calculate the mass of the second car.  (You can ignore forces of friction.)

A          640kg                         B          160kg

C          800kg                          D          3200kg                          E          1000kg

16.  The manufacturer of a family car gave the following information.
Mass of car 900 kg.  The car will accelerate from 0 to 20 m/s in 10 seconds.

Calculate the acceleration of the car during the 10 seconds

A          1m/s2                            B          2m/s2

C          18m/s2                          C          0.5m/s2                      E          11m/s2

17.  A car of mass 1000kg can produce an acceleration of 8m/s2.  Calculate the force produced by the engine – ignoring friction.

A          10000N                           B          100000N

C          8000N                             D          18000N               E          125N

Below is a velocity-time graph for a toy car travelling in a straight line.

18.  Calculate the acceleration of the car from B to C.

A          0.75m/s2                       B          -0.75m/s2

C          0.67m/s2                       D          -0.67m/s2                      E          -0.5m/s2

19.  Calculate the distance travelled by the car from A to B

A          2.25m                           B          1.5m

C          4.5m                             C          0.5625m                        E          2.75m

20.  A sky-diver steps out of an aeroplane.  After 30 seconds she is falling at a steady speed of 60m/s.  She then opens her parachute.  After another 8 seconds she is once again falling at a steady speed.  This speed is now only 15m/s.

Calculate the sky-diver’s average acceleration during the time from when she opens her parachute until she reaches her slower steady speed.

A          2m/s                             B          -5.625m/s

C          -2m/s                            D          4.255m/s                            E          -7.5m/s

21. When an object is at rest on a surface - what can you say about the forces on it?

 A     they are all equal B   they are unbalanced C     there are no forces on it D    all the forces cancel out E    all the forces are in the same direction

22.  For the above: What force acts downwards on the surface?

 A    weight B   air resistance C    reaction D   no force E   friction

23.  For the above: What force acts upwards?

 A    weight B   air resistance C    reaction D   no force E   friction

24.  For the above: What can you say about the size of the two forces

 A     they are both equal B   they are unbalanced C     there are no forces on it D   they equal the friction force E    the weight must be greater than the reaction

25.  When two bodies push on each other the forces they exert on each other are ______ and _________.

 A    weight and reaction B   unbalanced and equal C     equal and opposite D   balanced and identical E   friction and gravity

26.  _________ forces will have no effect on the movement of an object

 A    unbalanced B   balanced C     opposite D   identical E   drag

27.  When an object is not moving what effect will balanced forces have on the object?

 A    it will start moving B   it will speed up C    it will slow down D   it will not move E   it will decelerate

28.  When an object is moving - what effect will a balanced force have on the object?

 A    it will start moving faster B   it will speed up to a steady speed C    it will slow down D   it will not move E   it will keep going at a steady speed

29.  __________ forces are forces on an object that do not cancel out

 A    unbalanced B   balanced C     opposite D   identical E   drag

30.  Describe the motion of a stationary object if an unbalanced force acts on it

 A    no change B   it will accelerate C     decelerate D     it will accelerate or decelerate depending upon the forces E   impossible to say

31.  Describe the motion of a moving object if an unbalanced force acts on it.

 A    no change B   it will accelerate C     decelerate D     it will accelerate or decelerate depending upon the forces E   impossible to say

32.  How will the mass of the object affect the way it speeds up or slows down?

 A    no effect B  more massive objects are easier to accelerate and harder to decelerate C     more massive objects are harder to accelerate and harder to decelerate D more massive objects are easier to accelerate and easier to decelerate E   impossible to say

33.  What is a newton a unit of?

 A    mass B   weight C    acceleration D    gravity E   momentum

34.  How are force mass and acceleration related?

 A    force = mass / acceleration B   force = mass x acceleration C     force = acceleration / mass D    mass = force x acceleration E   they are not related

35.  A force of _______ acts when an object moves through air or water

 A   friction B   acceleration C    deceleration D    weight E   no force acts

36.  A force of _________ acts when solid surfaces slide (or tend to slide) across each other

 A   friction B   acceleration C    deceleration D    weight E   no force acts

37.  The direction of friction is always ________ to the direction in which the object is moving

 A   equal B   opposite C    unrelated

38.  The stopping distance of a car is defined as depending upon just two things ...what are they?

 A   the speed of vehicle AND driver's reactions B    if the vehicle is poorly maintained (e.g. worn brakes/tyres). AND the speed of vehicle C    if the driver is tired AND the speed of the vehicle D    the weight of the vehicle AND the speed of the vehicle E    the distance the vehicle travels during the driver's reaction time AND the distance the vehicle travels under the braking force

39.  When an object is moving faster through a fluid - how does this affect the force of friction on it?

 A   the force of friction is greater B   the force of friction is less C     the force of friction is unaffected

40.  When an object reaches its maximum speed when falling through a fluid - what do we call it?

 A    acceleration B   steady speed C    deceleration D    terminal velocity E   constant velocity

Press the button to check your answers: