Physics Y10

Question 1

Forces:

• Define
• What are the four forces
• How do you label force diagrams
• What is the equation?
• Unit?

Answer 1

• A push or pull
• Weight (down), Support force (up), Drag (resistance/friction), Thrust (push).
• Connect arrows to object, bigger arrow in the direction of travel.
• Fnet = m x a
• Newtons (N)

Question 2

Define and give equations for:

• Mass
• Weight
• Speed
• Acceleration

Answer 2

• How much matter is in an object (Kg)
• The downward force caused by gravity (Fw=Mxg)
• Rate or change of distance (v=d/t) (ms)
• The rate or change of speed (A=change in speed/time) (ms-2)

Question 3

How do you describe motion in terms of speed and acceleration?

Answer 3

• Constant speed
• Stationary
• increasing acceleration
• Negative acceleration

Question 4

Friction:

• define:
• How do you increase/decrease friction?
• When is friction helpful/not helpful?

Answer 4

• contact force that opposes motion
• Increase: make surface rough/dry. Decrease: make contact surface smaller, oily, more stream line.
• Helpful: Warming hands, soles on shoes, sand paper. Not helpful: wear in tires, more fuel to move cars, entry of space shuttles.

Question 5

Forces x2:

• List three contact forces:
• List three non-contact forces:

Answer 5

• support force, air resistance, thrust

- Magnetic, electrostatic and weight.

Question 6

Define and give formula and units:

• Power
• Voltage
• Current
• Resistance

Answer 6

• The amount of electrical energy each component uses (P=VxI), given in watts.
• The measure of hoe much energy each charge carries, (volts).
• The rate of flow of electrical charge, (amps, I)
• How much substance prevents the flow of electricity), (R=V/I), given in ohms.

Question 7

Circuits:

• What does voltage and current do in Series
• -What does voltage and current do in Parralel

Answer 7

• Current stays the same and voltage splits.

- Voltage stays the same and current splits