Physics 10 Core
Review Sheet for Chapters 16 & 18
Define: Work, Potential energy, kinetic energy, power, linear motion, rate, speed, instantaneous speed,
average speed, scalar quantity, vector quantity, acceleration.
Units : Work, Energy (potential & kinetic), power, distance, displacement, speed, velocity, acceleration.
Equation/triangle: Work, Potential energy, kinetic energy, power, speed, velocity, acceleration,
Newton’s second law.
Questions.
1- When a force of 5 N is applied on an object with a mass of 2kg, what is the total amount of work if
(a) distance = 0 m , (b) distance = 4m
2- Calculate the work done on an object with a mass of 5 kg carried vertically 2 m.
3- If you are lifting a box 3 m North or 3m East will the amount of work be different? Explain.
4- If an object with a mass of 2 kg has been elevated 1m and then 3m. Calculate the gravitational
potential energy at each height. Where was it more?
5- A 250 kg car is traveling at a speed of 30 m/s. What is the kinetic energy of the car?
6- Describe the changes in energy in a pendulum.
7- State the law of conservation of energy. Show and explain a diagram of how energy is conserved.
8- When will a person need more power, running up the stairs or walking up the stairs? Why? Is the
amount of work the same?
9- Calculate the power of the following:
(a) A torch bulb which uses 110J in 90s.
(b) A heater in a fish tank which uses 3600J in 4 hours.
10- A crane lifts a load weighing 3000N through a height of 5m in 10 seconds. What is the power of the
crane?
11- Explain what is meant by “motion is relative”.
12- What is used to measure instantaneous speed?
13- Lisa traveled a total distance of 500 km. Her trip took 6 hours. What was her average speed in m/s?
14- Give 2 examples of scalar and vector quantities.
15- Differentiate between distance and displacement. (Make sure you know how to calculate them from
picture like what was done in your notes).
16- Differentiate between speed and velocity.
17- What does a negative value of the velocity imply?
18- How can you change the velocity of your car?
19- How far does Bob run if he maintains an average velocity of 2 m/s for 8 s?
20 - One car is going 25 miles/hr north, another car is going 25 miles/hr south. Do they have the same
velocity? Explain.
21- When will the acceleration be 0 m/s2?
22- The driver of a car steps on the brakes, and the velocity drops from 20 m/s to 10 m/s in a time of 2
seconds. Find his acceleration.
23- What does negative acceleration mean?
24- What is meant by deceleration?
25- What is free fall?
26- In the absence of air resistance, will the feather and coin reach the ground at the same time if
dropped from the same height? Explain an experiment you can do to check this theory out.
27- Newton told us that all things on Earth attract each other. Why then aren’t we all stuck together?
28- State Newton’s second law.
Review problems of Newton’s second law from worksheet given.
You need to know:
- how to explain motion graphs (distance VS time, displacement VS time, and velocity VS time graphs).
Review from papers given.
- That the slope of a linear line in a distance VS time graph gives you the speed.
- That the slope of a linear line in a displacement VS time graph gives you the velocity.
- That the slope of a linear line in a velocity VS time graph gives you the acceleration.
-How to calculate the area under a velocity VS time graph to find the distance travelled.