Quarter 3 Notes and questions

Quarter 3 Notes and questions

Multiple Choice

Forces is a push or a pull

• true

• false

Multiple Choice

•In a tug of war, one team is pulling with a force of 300 N (to the left) and the other 180 N (to the right) what is the net force and direction? (choose the correct calculation below)

• 300N (left) – 180N (right) = 120N (to the left) unbalanced force

• 50N-90=50 unbalanced force

• 100N

• 150N (left)+90N (right)=240N Balanced force

Multiple Choice

the speed of an object in a particular direction

• directional speed

• velocity

Multiple Choice

Distance divided by time describes what property of motion?

• Speed

• Time

• Distance

Multiple Choice

•Using the formula Speed=Distance/Time. Calculate the speed of the following: A freefall jumper jumps out of a building, he is 90 meters above the ground, he takes 3 minute to reach the ground. Use the formula to calculate his speed. Remember to convert certain values when calculating.

1. Which the correct formula to be used for the above equation

• S=D/T

• W=m x g

• T=D/S

Multiple Choice

•Using the formula Speed=Distance/Time. Calculate the speed of the following: A freefall jumper jumps out of a building, he is 90 meters above the ground, he takes 3 minute to reach the ground. Use the formula to calculate his speed. Remember to convert certain values when calculating.

2. which is the correct convertion for 3 minutes in the above question?

• 3 x 60= 180s

• 60 minutes

• 63s

• 3+60=63s

Multiple Choice

•Using the formula Speed=Distance/Time. Calculate the speed of the following: A freefall jumper jumps out of a building, he is 90 meters above the ground, he takes 3 minute to reach the ground. Use the formula to calculate his speed. Remember to convert certain values when calculating.

3. Choose the correct answer below

• S=D/T: 30m/120s= 0.25m.s, the skydiver’s speed is 0.25m.s

• S=D/T: 90m/180s=0.5m. s, the skydiver’s speed is 0.5m.s

• S=D/T: 30m/1minute = 30m.s, the skydiver’s speed is 30m.s

Multiple Choice

•An object on earth has a mass of 50kg, which formula should be used to Calculate the objects weight?

• S=D/T

• W=m x g

Multiple Choice

Your mass will be the same on Earth and the Moon ?

• True

• False

Multiple Choice

I am the state of being when there is no net force of gravity. What am I?

• gravity

• weightlessness

Multiple Choice

When substituted into the formula (W=m x g)which is the correct use of the formula below ? ( remember mass of the object is 50Kg and the gravitational force on earth is 10m.s2)

• S= 50kg/ 10m.s2= 5

• W=50kg x 10m.s2= 500N

Multiple Choice

•Power=work/time: A small motor in a car does 24000J of work in 4minutes. What is the power of the motor in watts? (use the formula Power=work/time remember to convert certain values where needed) (choose the correct calculation below)

• The motor has 10 watts of power.

• P=W/T: 24000j/120s= 200w (the motor has 200 watts of power)

• P=W/T: 24000j/240s= 100w (the motor has 100 watts of power)

Multiple Choice

In a transverse wave, the highest point of the wave is called ?

• Crest

• trough

Multiple Choice

Amplitude measures the height of a wave in a transverse wave

• True

• False

Multiple Choice

Transverse waves have an up and down motion

• True

• False

Multiple Choice

Compression areas are areas on a longitudinal wave/compression wave where particles are close together.

• True

• False

Multiple Choice

areas on a wave where particles are apart are called?

• refraction

• rarefaction

• reflection

Multiple Choice

Light travels in a straight line called a(n)………..

• streak

• line

• ray

Multiple Choice

An object with a polished surface that forms reflected images is called ?

• mirror

• glass

• water

Multiple Select

Mirrors ( select the correct boxes

• all mirrors cause lateral inversion

• Concave mirrors make objects appear smaller

• Convex mirrors cause objects to appear smaller and give a wider view

• A convex mirror is used in cars

Multiple Choice

•Which material would be best , if you had to replace a house front window? (remember you want to have clear vision to see through the window)

• Opaque

• Transparent

• Translucent

Multiple Choice

which material would allow all no light to pass through?

• opaque

• Transparent

• Translucent

Multiple Choice

The bending of light is known as ?

• Reflection

• refraction

Multiple Choice

which type of lens refracts/bends light rays together to form an image/ bring to a focal point?

• Concave

• Convex