Welcome to your Grade 9 Physics chapter 4
After carefully reading the following 30 questions, choose the correct answer.
1.
What is the branch of mechanics that considers the forces that cause motion to occur?
2.
Which law of motion is also known as the law of inertia?
3.
What is the SI unit of work?
4.
According to Newton’s second law, the acceleration of an object is inversely proportional to its:
5.
What type of energy is possessed by an object due to its motion?
6.
If a boy pushes a box with a force of 60 N through a displacement of 12 m in the direction of the force, how much work is done?
7.
What is the sum of kinetic and potential energies known as?
8.
Which forces do not involve any physical contact between two bodies?
9.
According to Newton’s third law, action and reaction forces are equal in magnitude but opposite in:
10.
What is the height required for a 5 kg object to have a gravitational potential energy of 1000 J? (Take g = 10 m/s²)
11.
A frame in which Newton’s first law of motion is valid is called an:
12.
Power is described as the quantitative relationship between work and:
13.
In mechanics, what can change the velocity of a body or cause deformation by changing its shape?
14.
If a force is applied in a different direction than the direction of displacement, how much work is done?
15.
Which quantity is a scalar according to the definition of the product of force and parallel displacement?
16.
Potential energy is the energy possessed by an object due to its position or:
17.
What happens to the acceleration of an object if the net external force acting on it is doubled?
18.
In a smooth horizontal surface, if you exert force F and the block moves with acceleration a, what is the acceleration if the force is increased to 3F?
19.
Which of the following is an example of a contact force?
20.
In the formula W = F∥S, what does F∥ represent?
21.
An object at rest tends to stay at rest unless acted on by an:
22.
What is the SI unit of power?
23.
The formula for gravitational potential energy (Ep) is:
24.
What is the name of the Newton-meter (N m) unit?
25.
If an object is moved in a straight line with constant speed, what is the value of the unbalanced force acting on it?
26.
Carrying a box while walking does not result in work being done because the force is:
27.
When you remove your hand from an object so gravity is the only force, the object:
28.
The resistance of objects to changes in their state of motion is related to their:
29.
Mechanical energy is the sum of:
30.
Which branch of mechanics describes the motion of a moving body without considering the forces?
