Forces
Which force causes a car to move forward?
A) Thrust
B) Drag
A) Thrust
A motorcycle experiences two forces-- a thrust of 10N and air resistance and friction of 12N. Is the motorcycle moving forward or backward?
Backward
Would you weigh more on the earth or on the moon?
On the earth.
What unit do we use to measure speed? (name one)
km/h or m/s
What does the slope (gradient) of a distance/speed graph tell us?
The speed.
Charged objects attracting and repelling each other is an example of _____________ force.
A) Electrostatic Force
B) Magnetic Force
C) Gravitational Force
A) Electrostatic Force
Does lubrication reduce friction force or increase friction force?
Lubrication reduces friction
A baby has a mass of 4 kg. What is the weight on earth?
40N
JoJo travels 40km in 2 hours. What is his average speed?
20 km/h
What is indicated by a flat horizontal line on a distance/ time graph?
No motion.
A boat floats in water. The boat experiences an upward upthrust force of 20 N and a downward gravitational force of 20N. Are the forces balanced or unbalanced?
Balanced
Name one practical application of air resistance force.
Why do a hammer and feather fall at the same rate on the moon but not on the earth?
Because there is no air resistance on the moon.
Which instrument is more accurate?
A) A stop watch
B) A timing gate
Naira's line will be more steep because she was walking faster.