Grade 7 Revision

In a swimming race, Miho swam the first 50m in 42s. She swam the second 50m in 40s. What was Miho's average speed during the race?

• A- 0.82 m/s

• B-1.19 m/s

• C-1.22 m/s

• D-1.25 m/s

which of the following is an example of acceleration?

• A- A boat sits on a boat trailer

• B- A car moves in a straight line at 60k m/hr

• C- A plane moves in air at a steady speed of 850 km/hr

• D- A bus moves on a straight road and then makes a right turn

A box of books is on the floor. The following picture shows a push and a pull acting on the box.

What is the net force toward the right on the box?

• A-0 N

• B-50 N

• C-100 N

• D-2.500 N

What is gravity?

• A. the force that pushes all objects toward Earth

• B. the force that pulls all objects toward one another

• C. a magnetic force that is strongest at Earth's poles

• D. a stream of charged particles from the sun to Earth

A fluid exerts 500 N of force over an area that measures 0.5 m2. What is the pressure by exerted the fluid?

• A. 250 Pa

• B. 750 Pa

• C 1,000 Pa

• D. 2,000 Pa

1. Three objects are placed in water, Object A is less dense than the water. Object B is denser than the water, Object C and the water have the same density. Which object(s) will sink in the water?

• A. Object A only

• B. Object B only

• C. Objects A and C only

• D. Objects B and C only

. A lightbulb uses 2,000 J of energy in 1 min and

20 s. What is the power of the lightbulb?

• A. 25 W

• B. 50 w

• C. 60 w

• D.100 W

Which of the following best defines energy?

• A. the ability to do work

• B. the resistance to motion

• C. how fast an object moves

• D. amount of force in a given time

Which of the following has kinetic energy?

• A. a book sitting on a shelf

• B. A hat and gloves on a table

• C. a child kicking a soccer ball

• D. cars parked in a parking lot

What term describes the energy that is stored

due to the height of an object from the ground?

• A. kinetic energy

• B. chemical energy

• C. mechanical energy

• D. gravitational potential energy