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If a boat of mass 500kg is accelerating at 1m/s, the resultant force is 500N.

# Forces - Forces and Motion

This Physics quiz is called 'Forces - Forces and Motion' and it has been written by teachers to help you if you are studying the subject at senior high school. Playing educational quizzes is one of the most efficienct ways to learn if you are in the 11th or 12th grade - aged 16 to 18.

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Considering how forces affect the motion of objects is an important part of senior high school Physics. Many of the concepts and formulae used in this module were worked out by Sir Isaac Newton, the famous and talented seventeenth century scientist whose name is now used for the unit of force.

1.
What is the equation to find the acceleration of an object, knowing its initial and final velocities and the time taken?
a = (u - t)v
v = (a - u)t
u = (a - v)t
a = (v - u)t
It is always the final velocity minus the initial velocity divided by time. A negative value from the calculation means there was a deceleration
2.
What does the gradient of a velocity-time graph represent?
Acceleration
Velocity
Time
Distance
The gradient of a velocity-time graph measures the change in velocity per second, in other words, exactly the definition of acceleration
3.
What does the gradient of a distance-time graph represent?
Speed
Distance
Time
Resistance
The gradient of a graph is calculated by dividing the y value by the x value. In this case, you are dividing meters by seconds (or kilometers by hours and so on) so the units will be meters per second (or kilometers per hour etc) which you should recognize as being the units of speed
4.
What is the correct formula which links force, mass and acceleration?
F = m x a
m = F x a
a = F x m
C = m x a
This is the equation of Newton's second law of motion
5.
What is the unit used to measure force?
The pascal
The kilogram
The newton
The meter
Named after Isaac Newton since he carried out the key work that lead to an understanding of forces, although Galileo had already worked out the first law many years before Newton was born
6.
What is the mass of a person who is accelerated at a rate of 2 m/s2 when a resultant force of 130 N is applied?
55Kg
65Kg
75Kg
85Kg
Using the equation F = m x a, you can calculate the force required to accelerate an object, the mass of it or the acceleration of it when given two of the three values
7.
What is the acceleration of a ball whose initial velocity is 0 m/s and final velocity is 10 m/s if the ball takes 5 seconds to get to this speed?
1 m/s2
2 m/s2
3 m/s2
2 m/s
Remember that acceleration is the rate of change of velocity and its units are m/s2
8.
What is the acceleration of an object dependent on?
Mass
Resultant force
Neither mass nor resultant force
Both mass and resultant force
Changing either mass or resultant force will change the acceleration of an object
9.
What is velocity?
Speed in a given direction
Direction of an object
Speed of an object
Acceleration
Velocity is a vector quantity and has both magnitude (size) and direction. The magnitude represents how fast the object is moving and the direction represents in which direction it is going
10.
If a boat of mass 500 kg is accelerating at 1 m/s2, what is the resultant force?
250 N
500 N
750 N
1,000 N
Only unbalanced forces produce an acceleration
Author:  Martin Moore