Daily Science 14
Monday
1.Sheng takes a 3-hour trip. During the first hour, he drives 48 miles.
During the second hour, he drives 41 miles. During the last hour he drives 61 miles. What is Sheng’s average speed for this entire trip?
a.41 mph
b.48 mph
c.50 mph
d.61 mph
2. Water flowing over a waterfall is often used as a means of producing
energy. Where does the water in a waterfall have the most gravitational
potential energy?
a.at the top of the waterfall
b.as it is falling
c.at the bottom of the waterfall
d.as it flows away from the waterfall
3. Compare the effect of a balanced force with that of an unbalanced force.
Tuesday
1. What is the net force needed to accelerate a 32 kg wagon at 5m/s2?
a. 6.4 N
b. 27 N
c. 37 N
d. 160 N
2. Julio and Luis have to move a box containing a 35 kg television from one
room of their house to another. Julio has the ability to push with a force of
250 N while Luis can only push with a force of 100 N. If both boys pushed
the box in the same direction with all the force they could, what would be
the net force on the box, assuming no friction?
a. 250 N
b. 350 N
c. 100 N
d. 150 N
3.Explain the relationship between the size of the force of gravity and mass
and distance.
Wednesday
1. While riding her bicycle, Jessica goes from a full stop to 12 m/s in 4
minutes. How fast is she accelerating?
a. 3.0 m/s
b. 3.0 m/s2
c. 1.5 m/s
d. 1.5 m/s2
2. When Raquel jumps up to make a basket, which force returns her to the
ground?
a. mass
b. inertia
c. gravity
d. friction
3. Use Newton’s 1st and 2nd laws to explain why the seat-belt law saves
lives.
Thursday
1. A boat is moving east at a speed of 20 km/hr. The wind is blowing from
the west at 7 km/hr. Give the speed and direction of the boat.
a. 13 km/hr east
b. 27 km/hr east
c. 13 km/hr west
d. 27 km/hr west
2. Tai’s little brother Gan weighs 15 kg. His swing weighs 2 kg. How much
force will Tai need to use to push Gan on the swing to make Gan
accelerate at 4 m/s2?
a. 4 N
b. 12 N
c. 60 N
d. 68 N
3. Compare mass and weight.
Friday
1.Bernadette attaches an 8 N weight to a spring. The spring stretches to 4
cm with this weight hanging from it. What would the new length of the
spring be if a 12 N weight were used instead of the 8 N weight?
a. 12 cm
b. 10 cm
c. 8 cm
d. 6 cm
2.When a car skids on ice, what kind of friction is acting on the
wheels?
a. cold friction
b. static friction
c. sliding friction
d. rolling friction
3. A girl on roller skates accelerates at a rate of 2 meters per second per
second with a force of 100 newtons. What is her mass?